mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-15 00:13:30 +01:00
75f2f3b09d
Previously the ingestion performance has been limited by the slowest vmstorage node. Now vminsert should re-route data from the slowest vmstorage node to the remaining nodes.
556 lines
17 KiB
Go
556 lines
17 KiB
Go
package netstorage
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import (
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"flag"
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"fmt"
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"io"
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"sync"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/consts"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/handshake"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
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"github.com/VictoriaMetrics/metrics"
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xxhash "github.com/cespare/xxhash/v2"
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jump "github.com/lithammer/go-jump-consistent-hash"
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)
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var disableRPCCompression = flag.Bool(`rpc.disableCompression`, false, "Disable compression of RPC traffic. This reduces CPU usage at the cost of higher network bandwidth usage")
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func (sn *storageNode) isBroken() bool {
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return atomic.LoadUint32(&sn.broken) != 0
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}
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// push pushes buf to sn internal bufs.
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//
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// This function doesn't block on fast path.
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// It may block only if all the storageNodes cannot handle the incoming ingestion rate.
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// This blocking provides backpressure to the caller.
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//
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// The function falls back to sending data to other vmstorage nodes
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// if sn is currently unavailable or overloaded.
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//
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// rows is the number of rows in the buf.
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func (sn *storageNode) push(buf []byte, rows int) error {
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if len(buf) > maxBufSizePerStorageNode {
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logger.Panicf("BUG: len(buf)=%d cannot exceed %d", len(buf), maxBufSizePerStorageNode)
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}
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sn.rowsPushed.Add(rows)
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if sn.isBroken() {
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// The vmstorage node is temporarily broken. Re-route buf to healthy vmstorage nodes.
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if err := addToReroutedBuf(buf, rows); err != nil {
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return fmt.Errorf("%d rows dropped because the current vsmtorage is unavailable and %s", rows, err)
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}
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sn.rowsReroutedFromHere.Add(rows)
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return nil
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}
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sn.brLock.Lock()
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if len(sn.br.buf)+len(buf) <= maxBufSizePerStorageNode {
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// Fast path: the buf contents fits sn.buf.
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sn.br.buf = append(sn.br.buf, buf...)
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sn.br.rows += rows
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sn.brLock.Unlock()
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return nil
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}
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sn.brLock.Unlock()
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// Slow path: the buf contents doesn't fit sn.buf.
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// This means that the current vmstorage is slow or will become broken soon.
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// Re-route buf to healthy vmstorage nodes.
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if err := addToReroutedBuf(buf, rows); err != nil {
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return fmt.Errorf("%d rows dropped because the current vmstorage buf is full and %s", rows, err)
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}
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sn.rowsReroutedFromHere.Add(rows)
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return nil
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}
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var closedCh = func() <-chan struct{} {
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ch := make(chan struct{})
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close(ch)
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return ch
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}()
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func (sn *storageNode) run(stopCh <-chan struct{}) {
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ticker := time.NewTicker(time.Second)
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defer ticker.Stop()
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var br bufRows
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var bc *handshake.BufferedConn
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var err error
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var waitCh <-chan struct{}
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mustStop := false
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for !mustStop {
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sn.brLock.Lock()
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bufLen := len(sn.br.buf)
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sn.brLock.Unlock()
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waitCh = nil
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if len(br.buf) == 0 && bufLen > maxBufSizePerStorageNode/4 {
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// Do not sleep, since sn.br.buf contains enough data to process.
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waitCh = closedCh
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}
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select {
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case <-stopCh:
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mustStop = true
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// Make sure the sn.buf is flushed last time before returning
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// in order to send the remaining bits of data.
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case <-ticker.C:
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case <-waitCh:
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}
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if len(br.buf) == 0 {
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sn.brLock.Lock()
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sn.br, br = br, sn.br
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sn.brLock.Unlock()
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}
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if bc == nil {
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bc, err = sn.dial()
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if err != nil {
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// Mark sn as broken in order to prevent sending additional data to it until it is recovered.
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atomic.StoreUint32(&sn.broken, 1)
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if len(br.buf) == 0 {
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continue
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}
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logger.Errorf("re-routing %d bytes with %d rows to other storage nodes because cannot dial storageNode %q: %s",
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len(br.buf), br.rows, sn.dialer.Addr(), err)
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if addToReroutedBufNonblock(br.buf, br.rows) {
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sn.rowsReroutedFromHere.Add(br.rows)
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br.reset()
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}
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continue
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}
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}
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if err = sendToConn(bc, br.buf); err == nil {
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// Successfully sent buf to bc. Remove broken flag from sn.
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atomic.StoreUint32(&sn.broken, 0)
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sn.rowsSent.Add(br.rows)
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br.reset()
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continue
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}
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// Couldn't flush buf to sn. Mark sn as broken
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// and try re-routing buf to healthy vmstorage nodes.
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if err = bc.Close(); err != nil {
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logger.Errorf("cannot close connection to storageNode %q: %s", sn.dialer.Addr(), err)
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// continue executing the code below.
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}
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bc = nil
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sn.connectionErrors.Inc()
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atomic.StoreUint32(&sn.broken, 1)
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if addToReroutedBufNonblock(br.buf, br.rows) {
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sn.rowsReroutedFromHere.Add(br.rows)
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br.reset()
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}
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}
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}
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func sendToConn(bc *handshake.BufferedConn, buf []byte) error {
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if len(buf) == 0 {
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// Nothing to send
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return nil
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}
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timeoutSeconds := len(buf) / 3e5
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if timeoutSeconds < 60 {
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timeoutSeconds = 60
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}
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timeout := time.Duration(timeoutSeconds) * time.Second
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deadline := time.Now().Add(timeout)
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if err := bc.SetWriteDeadline(deadline); err != nil {
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return fmt.Errorf("cannot set write deadline to %s: %s", deadline, err)
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}
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// sizeBuf guarantees that the rows batch will be either fully
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// read or fully discarded on the vmstorage side.
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// sizeBuf is used for read optimization in vmstorage.
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sizeBuf := sizeBufPool.Get()
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defer sizeBufPool.Put(sizeBuf)
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sizeBuf.B = encoding.MarshalUint64(sizeBuf.B[:0], uint64(len(buf)))
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if _, err := bc.Write(sizeBuf.B); err != nil {
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return fmt.Errorf("cannot write data size %d: %s", len(buf), err)
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}
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if _, err := bc.Write(buf); err != nil {
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return fmt.Errorf("cannot write data with size %d: %s", len(buf), err)
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}
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if err := bc.Flush(); err != nil {
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return fmt.Errorf("cannot flush data with size %d: %s", len(buf), err)
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}
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// Wait for `ack` from vmstorage.
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// This guarantees that the message has been fully received by vmstorage.
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deadline = time.Now().Add(timeout)
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if err := bc.SetReadDeadline(deadline); err != nil {
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return fmt.Errorf("cannot set read deadline for reading `ack` to vmstorage: %s", err)
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}
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if _, err := io.ReadFull(bc, sizeBuf.B[:1]); err != nil {
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return fmt.Errorf("cannot read `ack` from vmstorage: %s", err)
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}
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if sizeBuf.B[0] != 1 {
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return fmt.Errorf("unexpected `ack` received from vmstorage; got %d; want %d", sizeBuf.B[0], 1)
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}
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return nil
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}
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var sizeBufPool bytesutil.ByteBufferPool
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func (sn *storageNode) dial() (*handshake.BufferedConn, error) {
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c, err := sn.dialer.Dial()
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if err != nil {
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sn.dialErrors.Inc()
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return nil, err
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}
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compressionLevel := 1
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if *disableRPCCompression {
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compressionLevel = 0
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}
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bc, err := handshake.VMInsertClient(c, compressionLevel)
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if err != nil {
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_ = c.Close()
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sn.handshakeErrors.Inc()
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return nil, fmt.Errorf("handshake error: %s", err)
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}
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return bc, nil
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}
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func rerouteWorker(stopCh <-chan struct{}) {
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ticker := time.NewTicker(time.Second)
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defer ticker.Stop()
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var br bufRows
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var waitCh <-chan struct{}
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mustStop := false
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for !mustStop {
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reroutedBRLock.Lock()
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bufLen := len(reroutedBR.buf)
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reroutedBRLock.Unlock()
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waitCh = nil
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if len(br.buf) == 0 && bufLen > reroutedBufMaxSize/4 {
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// Do not sleep if reroutedBR contains enough data to process.
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waitCh = closedCh
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}
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select {
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case <-stopCh:
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mustStop = true
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// Make sure reroutedBR is re-routed last time before returning
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// in order to reroute the remaining data to healthy vmstorage nodes.
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case <-ticker.C:
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case <-waitCh:
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}
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if len(br.buf) == 0 {
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reroutedBRLock.Lock()
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reroutedBR, br = br, reroutedBR
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reroutedBRLock.Unlock()
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}
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reroutedBRCond.Broadcast()
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if len(br.buf) == 0 {
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// Nothing to re-route.
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continue
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}
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sns := getHealthyStorageNodes()
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if len(sns) == 0 {
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// No more vmstorage nodes to write data to.
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rerouteErrors.Inc()
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logger.Errorf("cannot send rerouted rows because all the storage nodes are unhealthy")
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// Do not reset br in the hope it could be sent next time.
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continue
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}
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spreadReroutedBufToStorageNodes(sns, &br)
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// There is no need in br.reset() here, since it is already done in spreadReroutedBufToStorageNodes.
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}
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// Notify all the blocked addToReroutedBuf callers, so they may finish the work.
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reroutedBRCond.Broadcast()
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}
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// storageNode is a client sending data to vmstorage node.
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type storageNode struct {
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// broken is set to non-zero if the given vmstorage node is temporarily unhealthy.
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// In this case the data is re-routed to the remaining healthy vmstorage nodes.
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broken uint32
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// brLock protects br.
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brLock sync.Mutex
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// Buffer with data that needs to be written to the storage node.
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br bufRows
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dialer *netutil.TCPDialer
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// The number of dial errors to vmstorage node.
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dialErrors *metrics.Counter
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// The number of handshake errors to vmstorage node.
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handshakeErrors *metrics.Counter
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// The number of connection errors to vmstorage node.
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connectionErrors *metrics.Counter
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// The number of rows pushed to storageNode with push method.
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rowsPushed *metrics.Counter
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// The number of rows sent to vmstorage node.
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rowsSent *metrics.Counter
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// The number of rows rerouted from the given vmstorage node
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// to healthy nodes when the given node was unhealthy.
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rowsReroutedFromHere *metrics.Counter
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// The number of rows rerouted to the given vmstorage node
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// from other nodes when they were unhealthy.
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rowsReroutedToHere *metrics.Counter
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}
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// storageNodes contains a list of vmstorage node clients.
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var storageNodes []*storageNode
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var (
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storageNodesWG sync.WaitGroup
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rerouteWorkerWG sync.WaitGroup
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)
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var (
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storageNodesStopCh = make(chan struct{})
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rerouteWorkerStopCh = make(chan struct{})
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)
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// InitStorageNodes initializes vmstorage nodes' connections to the given addrs.
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func InitStorageNodes(addrs []string) {
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if len(addrs) == 0 {
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logger.Panicf("BUG: addrs must be non-empty")
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}
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if len(addrs) > 255 {
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logger.Panicf("BUG: too much addresses: %d; max supported %d addresses", len(addrs), 255)
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}
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for _, addr := range addrs {
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sn := &storageNode{
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dialer: netutil.NewTCPDialer("vminsert", addr),
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dialErrors: metrics.NewCounter(fmt.Sprintf(`vm_rpc_dial_errors_total{name="vminsert", addr=%q}`, addr)),
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handshakeErrors: metrics.NewCounter(fmt.Sprintf(`vm_rpc_handshake_errors_total{name="vminsert", addr=%q}`, addr)),
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connectionErrors: metrics.NewCounter(fmt.Sprintf(`vm_rpc_connection_errors_total{name="vminsert", addr=%q}`, addr)),
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rowsPushed: metrics.NewCounter(fmt.Sprintf(`vm_rpc_rows_pushed_total{name="vminsert", addr=%q}`, addr)),
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rowsSent: metrics.NewCounter(fmt.Sprintf(`vm_rpc_rows_sent_total{name="vminsert", addr=%q}`, addr)),
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rowsReroutedFromHere: metrics.NewCounter(fmt.Sprintf(`vm_rpc_rows_rerouted_from_here_total{name="vminsert", addr=%q}`, addr)),
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rowsReroutedToHere: metrics.NewCounter(fmt.Sprintf(`vm_rpc_rows_rerouted_to_here_total{name="vminsert", addr=%q}`, addr)),
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}
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_ = metrics.NewGauge(fmt.Sprintf(`vm_rpc_rows_pending{name="vminsert", addr=%q}`, addr), func() float64 {
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sn.brLock.Lock()
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n := sn.br.rows
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sn.brLock.Unlock()
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return float64(n)
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})
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_ = metrics.NewGauge(fmt.Sprintf(`vm_rpc_buf_pending_bytes{name="vminsert", addr=%q}`, addr), func() float64 {
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sn.brLock.Lock()
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n := len(sn.br.buf)
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sn.brLock.Unlock()
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return float64(n)
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})
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storageNodes = append(storageNodes, sn)
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storageNodesWG.Add(1)
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go func(addr string) {
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sn.run(storageNodesStopCh)
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storageNodesWG.Done()
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}(addr)
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}
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maxBufSizePerStorageNode = memory.Allowed() / 8 / len(storageNodes)
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if maxBufSizePerStorageNode > consts.MaxInsertPacketSize {
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maxBufSizePerStorageNode = consts.MaxInsertPacketSize
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}
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reroutedBufMaxSize = memory.Allowed() / 16
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if reroutedBufMaxSize < maxBufSizePerStorageNode {
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reroutedBufMaxSize = maxBufSizePerStorageNode
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}
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if reroutedBufMaxSize > maxBufSizePerStorageNode*len(storageNodes) {
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reroutedBufMaxSize = maxBufSizePerStorageNode * len(storageNodes)
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}
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rerouteWorkerWG.Add(1)
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go func() {
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rerouteWorker(rerouteWorkerStopCh)
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rerouteWorkerWG.Done()
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}()
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}
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// Stop gracefully stops netstorage.
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func Stop() {
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close(rerouteWorkerStopCh)
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rerouteWorkerWG.Wait()
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close(storageNodesStopCh)
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storageNodesWG.Wait()
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}
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// addToReroutedBuf adds buf to reroutedBR.
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//
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// It waits until the reroutedBR has enough space for buf or if Stop is called.
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// This guarantees backpressure if the ingestion rate exceeds vmstorage nodes'
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// ingestion rate capacity.
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//
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// It returns non-nil error only in the following cases:
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//
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// - if all the storage nodes are unhealthy.
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// - if Stop is called.
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func addToReroutedBuf(buf []byte, rows int) error {
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if len(buf) > reroutedBufMaxSize {
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logger.Panicf("BUG: len(buf)=%d cannot exceed reroutedBufMaxSize=%d", len(buf), reroutedBufMaxSize)
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}
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reroutedBRLock.Lock()
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defer reroutedBRLock.Unlock()
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for len(reroutedBR.buf)+len(buf) > reroutedBufMaxSize {
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if getHealthyStorageNodesCount() == 0 {
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rowsLostTotal.Add(rows)
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return fmt.Errorf("all the vmstorage nodes are unavailable and reroutedBR has no enough space for storing %d bytes; only %d bytes left in reroutedBR",
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len(buf), reroutedBufMaxSize-len(reroutedBR.buf))
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}
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select {
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case <-rerouteWorkerStopCh:
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rowsLostTotal.Add(rows)
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return fmt.Errorf("rerouteWorker cannot send the data since it is stopped")
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default:
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}
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// The reroutedBR.buf has no enough space for len(buf). Wait while the reroutedBR.buf is be sent by rerouteWorker.
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reroutedBufWaits.Inc()
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reroutedBRCond.Wait()
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}
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reroutedBR.buf = append(reroutedBR.buf, buf...)
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reroutedBR.rows += rows
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reroutesTotal.Inc()
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return nil
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}
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// addToReroutedBufNonblock adds buf to reroutedBR.
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//
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// It returns true if buf has been successfully added to reroutedBR.
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func addToReroutedBufNonblock(buf []byte, rows int) bool {
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if len(buf) > reroutedBufMaxSize {
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logger.Panicf("BUG: len(buf)=%d cannot exceed reroutedBufMaxSize=%d", len(buf), reroutedBufMaxSize)
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}
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reroutedBRLock.Lock()
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ok := len(reroutedBR.buf)+len(buf) <= reroutedBufMaxSize
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if ok {
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reroutedBR.buf = append(reroutedBR.buf, buf...)
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reroutedBR.rows += rows
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reroutesTotal.Inc()
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}
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reroutedBRLock.Unlock()
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return ok
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}
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func getHealthyStorageNodesCount() int {
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n := 0
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for _, sn := range storageNodes {
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if !sn.isBroken() {
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n++
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}
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}
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return n
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}
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func getHealthyStorageNodes() []*storageNode {
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sns := make([]*storageNode, 0, len(storageNodes)-1)
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for _, sn := range storageNodes {
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if !sn.isBroken() {
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sns = append(sns, sn)
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}
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}
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return sns
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}
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func spreadReroutedBufToStorageNodes(sns []*storageNode, br *bufRows) {
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var mr storage.MetricRow
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rowsProcessed := 0
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src := br.buf
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for len(src) > 0 {
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tail, err := mr.Unmarshal(src)
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if err != nil {
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logger.Panicf("BUG: cannot unmarshal MetricRow from reroutedBR.buf: %s", err)
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}
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rowBuf := src[:len(src)-len(tail)]
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src = tail
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idx := uint64(0)
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if len(sns) > 1 {
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h := xxhash.Sum64(mr.MetricNameRaw)
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idx = uint64(jump.Hash(h, int32(len(sns))))
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}
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attempts := 0
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for {
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sn := sns[idx]
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if sn.sendReroutedRow(rowBuf) {
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// The row has been successfully re-routed to sn.
|
|
break
|
|
}
|
|
|
|
// Cannot re-route data to sn. Try sending to the next vmstorage node.
|
|
idx++
|
|
if idx >= uint64(len(sns)) {
|
|
idx = 0
|
|
}
|
|
attempts++
|
|
if attempts < len(sns) {
|
|
continue
|
|
}
|
|
|
|
// There is no enough buffer space in all the vmstorage nodes.
|
|
// Return the remaining data to br.buf, so it may be processed later.
|
|
br.buf = append(br.buf[:0], rowBuf...)
|
|
br.buf = append(br.buf, src...)
|
|
br.rows -= rowsProcessed
|
|
return
|
|
}
|
|
rowsProcessed++
|
|
}
|
|
if rowsProcessed != br.rows {
|
|
logger.Panicf("BUG: unexpected number of rows processed; got %d; want %d", rowsProcessed, br.rows)
|
|
}
|
|
reroutedRowsProcessed.Add(rowsProcessed)
|
|
br.reset()
|
|
}
|
|
|
|
func (sn *storageNode) sendReroutedRow(buf []byte) bool {
|
|
if sn.isBroken() {
|
|
return false
|
|
}
|
|
sn.brLock.Lock()
|
|
ok := len(sn.br.buf)+len(buf) <= maxBufSizePerStorageNode
|
|
if ok {
|
|
sn.br.buf = append(sn.br.buf, buf...)
|
|
sn.br.rows++
|
|
sn.rowsReroutedToHere.Inc()
|
|
}
|
|
sn.brLock.Unlock()
|
|
return ok
|
|
}
|
|
|
|
var (
|
|
maxBufSizePerStorageNode int
|
|
|
|
reroutedBR bufRows
|
|
reroutedBRLock sync.Mutex
|
|
reroutedBRCond = sync.NewCond(&reroutedBRLock)
|
|
reroutedBufMaxSize int
|
|
|
|
reroutedRowsProcessed = metrics.NewCounter(`vm_rpc_rerouted_rows_processed_total{name="vminsert"}`)
|
|
reroutedBufWaits = metrics.NewCounter(`vm_rpc_rerouted_buf_waits_total{name="vminsert"}`)
|
|
reroutesTotal = metrics.NewCounter(`vm_rpc_reroutes_total{name="vminsert"}`)
|
|
_ = metrics.NewGauge(`vm_rpc_rerouted_rows_pending{name="vminsert"}`, func() float64 {
|
|
reroutedBRLock.Lock()
|
|
n := reroutedBR.rows
|
|
reroutedBRLock.Unlock()
|
|
return float64(n)
|
|
})
|
|
_ = metrics.NewGauge(`vm_rpc_rerouted_buf_pending_bytes{name="vminsert"}`, func() float64 {
|
|
reroutedBRLock.Lock()
|
|
n := len(reroutedBR.buf)
|
|
reroutedBRLock.Unlock()
|
|
return float64(n)
|
|
})
|
|
|
|
rerouteErrors = metrics.NewCounter(`vm_rpc_reroute_errors_total{name="vminsert"}`)
|
|
rowsLostTotal = metrics.NewCounter(`vm_rpc_rows_lost_total{name="vminsert"}`)
|
|
)
|