Commit Graph

223 Commits

Author SHA1 Message Date
YuDong Tang
cab3ef8294
app/vmselect:add command-line flag -search.inmemoryBufSizeBytes ()
add command-line flag `-search.inmemoryBufSizeBytes` for configuring size of in-memory buffers used by vmselect during processing of vmstorage responses. A new summary metric `vm_tmp_blocks_inmemory_file_size_bytes` is exposed to show the size of the buffer during requests processing. 

The new setting can be used by experienced users to adjust memory usage by vmselect when processing
many small read requests. Instead of allocating 4MB buffers each time, vmselect can be instructed to lower
the buffer size via `-search.inmemoryBufSizeBytes`. To make the decision whether this flag needs to be adjusted
users can consult with `vm_tmp_blocks_inmemory_file_size_bytes` which shows the actual size of buffers used
during query processing.

----------

The detailed information of this PR can be found in
https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6851

### Checklist

The following checks are **mandatory**:

- [ ] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

---------

Co-authored-by: hagen1778 <roman@victoriametrics.com>
2024-08-26 14:37:45 +02:00
hagen1778
c99700ae15
fix typos in comments
Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit f283126084)
2024-08-06 16:30:10 +02:00
Aliaksandr Valialkin
353766061b
app/{vminsert,vmselect}: pass proper args to metrics.UnregisterSet() after a8356f3a26 2024-07-15 20:27:40 +02:00
Aliaksandr Valialkin
d6415b2572
all: consistently use 'any' instead of 'interface{}'
'any' type is supported starting from Go1.18. Let's consistently use it
instead of 'interface{}' type across the code base, since `any` is easier to read than 'interface{}'.
2024-07-10 00:23:26 +02:00
Hui Wang
87cb132f53
app/vmselect/netstorage: do not retry request when complexity limit i… ()
…s already exceeded

---------

Signed-off-by: hagen1778 <roman@victoriametrics.com>
Co-authored-by: hagen1778 <roman@victoriametrics.com>
2024-07-01 16:38:15 +02:00
Aliaksandr Valialkin
30d1f0711f
app/vmselect/netstorage: add a comment explaining why all the samples in block are taken into account when checking the -search.maxSamplesPerQuery limit
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5851

This is a follow-up for b07a02c516
2024-06-25 03:06:42 +02:00
Aliaksandr Valialkin
a5445e09c2
Revert "app/vmselect: fix the way of counting raw samples in single query ()"
This reverts commit 5ecf439078.

Reason for revert: the previous logic was correct.

The purpose of `-search.maxSamplesPerQuery` command-line flag is to limit the amounts of CPU resources,
which could be taken by a single query - see https://docs.victoriametrics.com/#resource-usage-limits .
VictoriaMetrics processes samples in blocks during querying - it reads the block, then unpacks it,
then filters out samples outside the selected time range. This means that it _spends CPU time_
on reading and unpacking of _all the samples_ in every block on the requested time range,
even if only a single sample per each block matches the given time range.

The previous logic was effectively limiting CPU time a single query could take.
The new logic fails limiting CPU time a single query could take in some pathological cases
when only a small fraction of samples per each requested block fit the requested time range.
This allows performing multiplication DoS-attacks by querying very narrow time ranges over historical blocks,
which tend to be full. For example, if the `-search.maxSamplesPerQuery` equals to a billion,
and the query requests a single sample out of 8K samples per each block, this means that the query
may unpack a billion of such blocks without exceeding the limit, e.g. it may unpack and process 8K*1e9=8e12 samples.
This is not what the resource usage limits were created for originally - see https://docs.victoriametrics.com/#resource-usage-limits

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5851
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6464
2024-06-25 02:55:43 +02:00
Hui Wang
5ecf439078
app/vmselect: fix the way of counting raw samples in single query ()
The limit is specified with command-line flag
`-search.maxSamplesPerQuery`.
Previously, samples might be over-counted and query can't be fixed by
reducing time range.
address https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5851

(cherry picked from commit 6e395048d3)
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2024-06-14 16:24:31 +02:00
Aliaksandr Valialkin
90794e84bc
app/vmselect/netstorage: add support for the ability to set cross-group replication factor at vmselect
The cross-group replication factor can be set via `-globalReplicationFactor` command-line flag at vmselect.
In this case vmselect continues returning full responses if up to globalReplicationFactor-1 groups are unavailable.

See https://docs.victoriametrics.com/cluster-victoriametrics/#vmstorage-groups-at-vmselect for details.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6054
2024-04-19 00:16:04 +02:00
Aliaksandr Valialkin
00f59d6ddf
all: fix golangci-lint(revive) warnings after 0c0ed61ce7
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6001
2024-04-03 03:00:45 +03:00
Aliaksandr Valialkin
e51190a34c
Revert "app/vmselect: make vmselect resilient to absence of cache folder ()"
This reverts commit cb23685681.

Reason for revert: the "fix" may hide programming bugs related to incorrect creation of folders
before their use. This may complicate detecting and fixing such bugs in the future.

There are the following fixes for the issue https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5985 :
- To configure the OS to do not drop data from the system-wide temporary directory (aka /tmp).
- To run VictoriaMetrics with -cacheDataPath command-line flag, which points to the directory,
  which cannot be removed automatically by the OS.

The case when the user accidentally deletes the directory with some files created by VictoriaMetrics
shouldn't be considered as expected, so VictoriaMetrics shouldn't try resolving this case automatically.
It is much better from operation and debuggability PoV is to crash with the clear `directory doesn't exist` error
in this case.
2024-04-03 02:44:00 +03:00
Roman Khavronenko
548bf31dd2
app/vmselect: make vmselect resilient to absence of cache folder ()
vmselect uses a cache folder in file system for two purposes:
1. Storing rollup cache results on shutdown;
2. Storing temporary search results from vmstorage during query executions.

It could happen that cache folder is deleted accidentally by user, or by OS
during cleanup routines. This would cause vmselect to:
1. panic on /metrics call, because `MustGetFreeSpace` will fail;
2. return query error user, as it won't be able to store temporary search results.

The changes in this commit are the following:
1. Make `MustGetFreeSpace` to try re-creating the cache folder if it is missing;
2. Make vmselect to try re-creating the cache folder if it can't persist tmp search
results.

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5985

Signed-off-by: hagen1778 <roman@victoriametrics.com>
Co-authored-by: Nikolay <nik@victoriametrics.com>
(cherry picked from commit cb23685681)
2024-03-26 15:27:32 +01:00
Aliaksandr Valialkin
319d21eddf
app/vmselect/netstorage: usae unsafe.SliceData instead of deprecated reflect.SliceHeader 2024-02-29 17:38:14 +02:00
Aliaksandr Valialkin
63d635a5e4
app: consistently use atomic.* types instead of atomic.* functions
See ea9e2b19a5
2024-02-24 03:06:14 +02:00
Dan Dascalescu
0c7eda7c88
app/vmselect: simplify wording for too many samples error ()
(cherry picked from commit 17cf031fa1)
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2024-02-20 16:29:11 +01:00
Aliaksandr Valialkin
7a9f0b32a2
app/vmselect/netstorage: prevent from disk write IO when closing temporary files
Remove temporary file before closing it in order to signal the OS that it shouldn't
store the file contents from page cache to disk when the file is closed.

Gracefully handle the case when the file cannot be removed before being closed -
in this case remove the file after closing it. This allows working on Windows.

Also remove superflouos opening of temporary file for reading - re-use already opened file handle for writing.

This is a follow-up for 9b1e002287
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4020
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/70
2024-02-01 19:54:48 +02:00
Aliaksandr Valialkin
4f5cb17042
app/vmselect/netstorage: properly handle the case when an empty brsPool points to the end of brs.brs
This case is possible after a new brsPool is allocated. The fix is to verify whether len(brsPool) >= len(brs.brs)
before trying to append a new item to brsPool and sharing its contents with brs.brs.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5733
2024-01-31 10:31:51 +02:00
Aliaksandr Valialkin
d8c82b6421
app/vmselect/netstorage: initialize tmpBlocksFileWrapper at goroutine, which continues using it
This may improve CPU cache locality
2024-01-26 21:29:30 +01:00
Aliaksandr Valialkin
cfc1193d15
app/vmselect/netstorage: limit the maximum brsPool size to 32Kb at ProcessSearchQuery()
This avoids slow path in Go runtime for allocating objects bigger than 32Kb -
see 704401ffa0/src/runtime/malloc.go (L11)

This also reduces memory usage a bit for vmselect and single-node VictoriaMetrics
after the commit 5dd37ad836 .

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5527
2024-01-23 14:12:27 +02:00
Aliaksandr Valialkin
fe4ea30a79
app/vmselect/netstorage: limit the size of metricNamesBuf to 32Kb in order to avoid slow path at Go runtime for allocating a byte slice of bigger size
See 704401ffa0/src/runtime/malloc.go (L11)

This also reduces the average memory usage a bit for vmselect and single-node VictoriaMetrics
after the commit 508c608062

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5527
2024-01-23 13:50:59 +02:00
Aliaksandr Valialkin
953b96ced2
app/vmselect/netstorage: remove tswPool, since it isnt efficient 2024-01-23 02:29:13 +02:00
Aliaksandr Valialkin
68a59bfabd
app/vmselect/netstorage: avoid metricName->blockRef lookup when processing multiple blocks for the same time series
This saves a few CPU cycles for common case
2024-01-23 02:29:12 +02:00
Aliaksandr Valialkin
f8a9ef8cbd
app/vmselect/netstorage: group per-vmstorage fields at tmpBlocksFileWrapperShard
This improves code readability a bit
2024-01-23 02:29:12 +02:00
Aliaksandr Valialkin
d52b121222
app/vmselect/netstorage: use []blockRef from blockRefPool in order to reduce memory allocations 2024-01-23 02:29:11 +02:00
Aliaksandr Valialkin
5b05224eb9
app/vmselect/netstorage: substitute pointer to blockRefs by brssPool index at the metricName->blockRefs map
This should reduce the pressure on Go GC, since it will see lower number of pointers.

This change has been extracted from https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5527
2024-01-23 02:29:11 +02:00
Aliaksandr Valialkin
b289f15f02
app/vmselect/netstorage: reduce the number of allocations for blockRefs objects in ProcessSearchQuery()
This should reduce pressure on Go GC at vmselect

The change has been extracted from https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5527
2024-01-23 02:29:11 +02:00
Aliaksandr Valialkin
2ab9a75cca
app/vmselect/netstorage: reduce the number of memory allocations in ProcessSearchQuery() by storing all the metric names in a single byte slice
This reduces the number of memory allocations at the cost of possible memory usage increase,
since now different metric name strings may hold references to the previous byte slice.
This is good tradeoff, since ProcessSearchQuery is called in vmselect, and vmselect isn't usually limited by memory.

This change has been extracted from https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5527
2024-01-23 02:29:10 +02:00
Aliaksandr Valialkin
c888d76c4b
app/vmselect/netstorage: make sure that at least a single result is collected from every storage group before deciding whether it is OK to skip results from the remaining storage nodes 2023-12-20 19:53:49 +02:00
Aliaksandr Valialkin
e4bb2808f1
app/vmselect: add support for vmstorage groups with independent -replicationFactor per group
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5197

See https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#vmstorage-groups-at-vmselect

Thanks to @zekker6 for the initial pull request at https://github.com/VictoriaMetrics/VictoriaMetrics-enterprise/pull/718
2023-12-13 00:14:34 +02:00
Aliaksandr Valialkin
5b7f40907e
app/vmselect/netstorage: do not retry request when deadline is exceeded 2023-11-14 19:57:29 +01:00
Roman Khavronenko
cd2247b24a
app/vmselect: limit the number of parallel workers by 32 ()
* app/vmselect: limit the number of parallel workers by 32

The change should improve performance and memory usage during query processing
on machines with big number of CPU cores. The number of parallel workers for
query processing is controlled via `-search.maxWorkersPerQuery` command-line flag.
By default, the number of workers is limited by the number of available CPU cores,
but not more than 32. The limit can be increased via `-search.maxWorkersPerQuery`.

Signed-off-by: hagen1778 <roman@victoriametrics.com>

* wip

- The `-search.maxWorkersPerQuery` command-line flag doesn't limit resource usage,
  so move it from the `resource usage limits` to `troubleshooting` chapter at docs/Single-server-VictoriaMetrics.md

- Make more clear the description for the `-search.maxWorkersPerQuery` command-line flag

- Add the description of `-search.maxWorkersPerQuery` to docs/Cluster-VictoriaMetrics.md

- Limit the maximum value, which can be passed to `-search.maxWorkersPerQuery`, to GOMAXPROCS,
  because bigger values may worsen query performance and increase CPU usage

- Improve the the description of the change at docs/CHANGELOG.md. Mark it as FEATURE instead of BUGFIX,
  since it is closer to a feature than to a bugfix.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5087

---------

Signed-off-by: hagen1778 <roman@victoriametrics.com>
Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
2023-10-26 09:15:27 +02:00
Aliaksandr Valialkin
9c3a37597c
app/vmselect/netstorage: run make fmt after 58326dbf25 2023-09-10 15:18:15 +02:00
Aliaksandr Valialkin
58326dbf25
app/vmselect: return 503 status code when partial responses are denied and some of vmstorage nodes are temporarily unavailable
This should help detecting this case and automatic retrying the query at healthy cluster replica
in another availability zone.

This commit is needed as a preparation for automatic query retry at another backend at vmauth on 5xx errors
as described at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4792#issuecomment-1674338561
2023-09-07 16:07:06 +02:00
Aliaksandr Valialkin
d8afd7fe98
Makefile: update golangci-lint from v1.51.2 to v1.54.2
See https://github.com/golangci/golangci-lint/releases/tag/v1.54.2
2023-09-01 10:25:49 +02:00
Aliaksandr Valialkin
19d61737c1
app/{vminsert,vmselect}: follow-up after 2b7b3293c1
- Document the change at docs/CHANGELOG.md
- Set the default value for -vmstorageUserTimeout to 3 seconds. This is much better
  than the 0 value, which means that TCP connection to unreachable vmstorage could block
  for up to 16 minutes.
- Document -vmstorageUserTimeout at docs/Cluster-VictoriaMetrics.md
2023-08-29 12:17:39 +02:00
Will Jordan
2b7b3293c1
Add vmstorageUserTimeout flags to configure TCP user timeout (Linux) ()
`TCP_USER_TIMEOUT` (since Linux 2.6.37) specifies the maximum amount of
time that transmitted data may remain unacknowledged before TCP will
forcibly close the connection and return `ETIMEDOUT` to the application.

Setting a low TCP user timeout allows RPC connections quickly reroute
around unavailable storage nodes during network interruptions.
2023-08-29 11:46:39 +02:00
Aliaksandr Valialkin
992c300ce9
all: replace atomic.Value with atomic.Pointer[T]
This eliminates the need in .(*T) casting for results obtained from Load()

Leave atomic.Value for map, since atomic.Pointer[map[...]...] makes double pointer to map,
because map is already a pointer type.
2023-07-19 17:48:26 -07:00
Aliaksandr Valialkin
e1a2404db5
app/vmselect/netstorage: follow-up after 173ccf4333
- Clarify docs about -replicationFactor command-line flag at vmselect
- Clarify description for -replicationFactor and -search.skipSlowReplicas command-line flags
- Fix the logic for returning responses if -search.skipSlowReplicas command-line flag
  is enabled. The logic was broken in the 173ccf4333,
  so it could return responses only if some of vmstorage nodes return error,
  while it should return when query results are successfully collected from more than
  (len(storageNodes) - replicationFactor) vmstorage nodes.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1207
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/711
2023-07-09 11:58:22 -07:00
Haleygo
14e242d0b9
vmselect: fix result collect count () 2023-07-08 08:21:27 +02:00
Roman Khavronenko
173ccf4333
vmselect: introduce search.skipSlowReplicas cmd-line flag ()
* vmselect: introduce `search.skipSlowReplicas` cmd-line flag

vmselect has two logical conditions during request processing when
`-replicationFactor` cmd-line flag is set:
1. If at least `len(storageNodes) - replicationFactor` responded, it could skip
waiting for the rest of nodes to respond. This could lead to problems described
here https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1207.
2. Mark response as partial if less than `len(storageNodes) - replicationFactor` responded
without an error.

The P1 showed itself error-prone and became the main reason why
`-replicationFactor` wasn't recommended to use at vmselect level.
However, this optimization could be still very useful in situations
when there are slow and fast replicas in cluster.

But P2 remains viable and important conditionless.
Hiding P1 behind the feature-flag `search.skipSlowReplicas`
should make `-replicationFactor` flag usable again. And let users
choose whether they want P1 to be respected.

Related issues
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1207
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/711

Signed-off-by: hagen1778 <roman@victoriametrics.com>

* docs: update changelog

Signed-off-by: hagen1778 <roman@victoriametrics.com>

---------

Signed-off-by: hagen1778 <roman@victoriametrics.com>
2023-07-07 11:50:26 +02:00
Aliaksandr Valialkin
eb47ad4b69
app/vmselect/netstorage: remove runtime.Gosched() call from unpackWorker()
This should improve scalability of unpackWorker() on systems with many CPU cores.
This is a follow-up for a2ecf4fa4a and 16f3b279a2

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966
2023-07-06 10:07:42 -07:00
Aliaksandr Valialkin
ec75d9097d
app/vmselect/netstorage: follow-up after 11ac551d52
- Clarify the scope of the fix at docs/CHANGELOG.md
- Handle the case when -search.maxSamplesPerSeries limit is exceeded
  in the same way as the -search.maxSamplesPerQuery limit.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4472
2023-07-05 21:13:34 -07:00
Aliaksandr Valialkin
643e99a157
app/vmselect/netstorage: improve code readability a bit after 6c84b61893
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4364
2023-07-05 20:48:38 -07:00
Roman Khavronenko
11ac551d52
app/vmselect/netstorage: properly process -search.maxSamplesPerQuery limit ()
Properly return the error to user when `-search.maxSamplesPerQuery` limit is exceeded.
Before, user could have received a partial response instead.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
2023-06-23 13:17:34 +02:00
Haleygo
6c84b61893
vmselect:fix init sn take too much time ()
* vmselect: descrease start time for vmselect

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4364
2023-05-30 13:04:31 +02:00
Aliaksandr Valialkin
aac3dccfd1
lib/fs: replace MkdirAllIfNotExist->MustMkdirIfNotExist and MkdirAllFailIfExist->MustMkdirFailIfExist
Callers of these functions log the returned error and then exit. The returned error already contains the path
to directory, which was failed to be created. So let's just log the error together with the call stack
inside these functions. This leaves the debuggability of the returned error at the same level
while allows simplifying the code at callers' side.

While at it, properly use MustMkdirFailIfExist instead of MustMkdirIfNotExist inside inmemoryPart.MustStoreToDisk().
It is expected that the inmemoryPart.MustStoreToDick() must fail if there is already a directory under the given path.
2023-04-13 22:22:08 -07:00
Nikolay
b38a145cfd
app/vmselect: properly remove temp files at windows system ()
With non-posix compliant systems it's not possible to remove unclosed files.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/70
2023-03-27 18:10:44 -07:00
Aliaksandr Valialkin
db3bcbe56a
app/vmselect/netstorage: reduce the contention at fs.ReaderAt stats collection on systems with big number of CPU cores
This optimization is based on the profile provided at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966#issuecomment-1483208419
2023-03-25 16:38:39 -07:00
Aliaksandr Valialkin
a2ecf4fa4a
app/vmselect/netstorage: document why runtime.Gosched() is removed at 28f054bb00
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966
2023-03-25 16:38:28 -07:00
Zakhar Bessarab
16f3b279a2
vmselect/netstorage: remove direct calls to Gosched to reduce amount of locks for global scope
using `runtime.Gosched` requires acquiring global lock to check if there are any other goroutines to perform tasks. with the latest versions of runtime it can pause running goroutines automatically without requiring to call `Gosched` directly.

Updates 

Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
2023-03-25 16:37:58 -07:00