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stats: disable stats by default #693

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merged 4 commits into from
Jan 14, 2021
Merged

stats: disable stats by default #693

merged 4 commits into from
Jan 14, 2021

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3pointer
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@3pointer 3pointer commented Jan 14, 2021 •
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What problem does this PR solve?

Disable backup stats by default. because of

  1. DumpStatsToJson is not stable
  2. It increases memory usage may cause BR OOM

What is changed and how it works?

  1. set cfg.IgnoreStats default to true
  2. if cfg.IgnoreStats is true, set statsLease to -1

Check List

Tests

  • Integration test

Related changes

  • Need to cherry-pick to the release branch
  • Need to update the documentation

Release Note

  • Disable backup stats by default to avoid BR reached OOM issue during backup.

@3pointer 3pointer added needs-cherry-pick-release-4.0 needs-cherry-pick-5.0-rc Priority/P0 Top priority issue. Must have an associated milestone labels Jan 14, 2021
@3pointer 3pointer changed the title WIP: stats: disable stats by default stats: disable stats by default Jan 14, 2021
overvenus
overvenus reviewed Jan 14, 2021
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cmd/backup.go
@@ -30,6 +31,11 @@ func runBackupCommand(command *cobra.Command, cmdName string) error {
ctx, store = trace.TracerStartSpan(ctx)
defer trace.TracerFinishSpan(ctx, store)
}
if cfg.IgnoreStats {
// Do not run stat worker in BR.
session.DisableStats4Test()
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What about restore?

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@3pointer 3pointer Jan 14, 2021 •
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It's not easy to distinguish whether we should DisableStats4Test in restoration. I had two ideas

  1. Read backupmeta and check all tables whether stats != nil. but we should do it carefully, because read backupmeta is in task.runRestore and we cannot run DisableStats4Test otherwise it will influence BR via SQL.

  2. Change kvproto to record the status of --ignore-stats. and this will involve other repo.

So both of them will change a lot. we need to confirm the cost of DisableStats4Test and is it worth for the above changes?

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LoadStatsFromJson only execute SQL to storage. so we can disable stats loop directly.

kennytm
kennytm reviewed Jan 14, 2021
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lgtm

@ti-srebot ti-srebot added the status/LGT1 LGTM1 label Jan 14, 2021
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Test restore with sysbench 3000 tables.
v4.0.8 mem inuse 61M
v4.0.9 mem inuse 88.96M
v4.0.9 + #693 mem inuse 81.66M

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LGTM

@ti-srebot ti-srebot removed the status/LGT1 LGTM1 label Jan 14, 2021
@ti-srebot ti-srebot added the status/LGT2 LGTM2 label Jan 14, 2021
@3pointer 3pointer merged commit 87eb3ed into pingcap:master Jan 14, 2021
ti-srebot pushed a commit to ti-srebot/br that referenced this pull request Jan 14, 2021
@3pointer @ti-srebot
cherry pick pingcap#693 to release-4.0
40c59e8 
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
@ti-srebot ti-srebot mentioned this pull request Jan 14, 2021
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cherry pick to release-4.0 in PR #696

ti-srebot pushed a commit to ti-srebot/br that referenced this pull request Jan 14, 2021
@3pointer @ti-srebot
cherry pick pingcap#693 to release-5.0-rc
b7fe252 
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
@ti-srebot ti-srebot mentioned this pull request Jan 14, 2021
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cherry pick to release-5.0-rc in PR #697

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Test backup with sysbench 3000 tables.
v4.0.9 + #693 inuse Showing nodes accounting for 21.65MB, 72.98% of 29.66MB total
v4.0.9 inuse Showing nodes accounting for 30.05MB, 62.90% of 47.78MB total

We can reduce the memory inuse with this PR.

3pointer added a commit that referenced this pull request Jan 14, 2021
@ti-srebot @3pointer
stats: disable stats by default (#693) (#696)
e8a906b 
* cherry pick #693 to release-4.0

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

Co-authored-by: 3pointer <luancheng@pingcap.com>
@kennytm kennytm mentioned this pull request Jan 18, 2021
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@tennix tennix mentioned this pull request Jan 18, 2021
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