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https://issues.apache.org/jira/browse/IGNITE-9612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexei Scherbakov updated IGNITE-9612:
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Ignite Flags: (was: Docs Required)
> Improve checkpoint mark phase speed.
> ------------------------------------
>
> Key: IGNITE-9612
> URL: https://issues.apache.org/jira/browse/IGNITE-9612
> Project: Ignite
> Issue Type: Improvement
> Reporter: Alexei Scherbakov
> Assignee: Alexei Scherbakov
> Priority: Major
> Fix For: 2.7
>
>
> I'm observing regular slow checkpoints due to long mark duration, which is
> not related to dirty pages number:
> {noformat}
> 2018-09-01 14:55:20.408 [INFO
> ][db-checkpoint-thread-#241%DPL_GRID%DplGridNodeName%][o.a.i.i.p.c.p.GridCacheDatabaseSharedManager]
> Checkpoint started [checkpointId=01e0c7bf-842f-4ed6-8589-b4904063434f,
> startPtr=FileWALPointer [idx=19814, fileOff=948996096, len=5233457],
> checkpointLockWait=0ms, checkpointLockHoldTime=951ms,
> walCpRecordFsyncDuration=39ms, pages=78477, reason='timeout']
> 2018-09-01 14:55:21.307 [INFO
> ][db-checkpoint-thread-#241%DPL_GRID%DplGridNodeName%][o.a.i.i.p.c.p.GridCacheDatabaseSharedManager]
> Checkpoint finished [cpId=01e0c7bf-842f-4ed6-8589-b4904063434f, pages=78477,
> markPos=FileWALPointer [idx=19814, fileOff=948996096, len=5233457],
> walSegmentsCleared=0, walSegmentsCovered=[], *markDuration=1002m*s,
> pagesWrite=478ms, fsync=421ms, total=1901ms]
> {noformat}
> {noformat}
> 2018-09-01 14:58:20.355 [INFO
> ][db-checkpoint-thread-#241%DPL_GRID%DplGridNodeName%][o.a.i.i.p.c.p.GridCacheDatabaseSharedManager]
> Checkpoint started [checkpointId=09d1f4bc-d3f3-4a16-b291-89d7fa745ea5,
> startPtr=FileWALPointer [idx=19814, fileOff=1000024208, len=5233457],
> checkpointLockWait=0ms, checkpointLockHoldTime=926ms,
> walCpRecordFsyncDuration=14ms, pages=10837, reason='timeout']
> 2018-09-01 14:58:20.480 [INFO
> ][db-checkpoint-thread-#241%DPL_GRID%DplGridNodeName%][o.a.i.i.p.c.p.GridCacheDatabaseSharedManager]
> Checkpoint finished [cpId=09d1f4bc-d3f3-4a16-b291-89d7fa745ea5, pages=10837,
> markPos=FileWALPointer [idx=19814, fileOff=1000024208, len=5233457],
> walSegmentsCleared=0, walSegmentsCovered=[], *markDuration=943ms*,
> pagesWrite=64ms, fsync=61ms, total=1068ms]
> {noformat}
> Debugging has revealed what this is due to large amount of work required to
> save metadata for metapages and free/reuse lists. Because this is done under
> checkpoint write lock, all other activities are blocked, resulting in
> increased tx and atomic ops latency.
> Simple solution: parallelize metadata processing during mark phase.
> Best way to solve the problem is described in IGNITE-9520.
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