[jira] [Created] (IGNITE-7182) Long sorting of pages collection on checkpoint begin can cause zero dropdown even with throttling enabled

[Anton Vinogradov (Jira)]

Ivan Rakov created IGNITE-7182:
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             Summary: Long 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: Bug
          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 af 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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