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https://issues.apache.org/jira/browse/IGNITE-7182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293704#comment-16293704
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ASF GitHub Bot commented on IGNITE-7182:
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GitHub user dspavlov opened a pull request:
https://github.com/apache/ignite/pull/3244
IGNITE-7182: throttle only changes
Part of implementation changes throttling policy
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gridgain/apache-ignite
ignite-7182-throttle-only
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/ignite/pull/3244.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3244
----
commit dd8a7ac47df1dc401e5a98dc21f9a0988fb50b0f
Author: dpavlov <[email protected]>
Date: 2017-12-01T16:47:45Z
GG-13117: PDS compatibility test flaky failure: debug code added
commit 6c7b4fb24542672944220dca94efffa94a969ee2
Author: dspavlov <[email protected]>
Date: 2017-12-16T07:49:42Z
IGNITE-7182: Throttle only changes, fixes too aggressive throttling at CP
begin
----
> Slow sorting of pages collection on checkpoint begin can cause zero dropdown
> even with throttling enabled
> ---------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-7182
> URL: https://issues.apache.org/jira/browse/IGNITE-7182
> Project: Ignite
> Issue Type: Improvement
> Components: persistence
> Affects Versions: 2.3
> Reporter: Ivan Rakov
> Assignee: Dmitriy Pavlov
> Fix For: 2.4
>
>
> Tests show that GridCacheDatabaseSharedManager#splitAndSortCpPagesIfNeeded
> call can last several seconds on nodes with big amount of memory (>10GB). We
> should optimize sorting algorithm, possibly making it multithreaded.
> Another option to make pages write throttling more smooth is to get rid of
> this heuristic:
> {noformat}
> // Starting with 0.05 to avoid throttle right after
> checkpoint start
> // 7/12 is maximum ratio of dirty pages
> dirtyRatioThreshold = (dirtyRatioThreshold * 0.95 + 0.05) * 7
> / 12;
> {noformat}
> We should replace "magic" lower bound 0.05 * 7 / 12 with the real percentage
> of dirty pages at the moment of
> GridCacheDatabaseSharedManager.Checkpointer#markCheckpointBegin call return.
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