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https://issues.apache.org/jira/browse/CASSANDRA-16261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ekaterina Dimitrova updated CASSANDRA-16261:
--------------------------------------------
Test and Documentation Plan:
Patch committed:
* trunk -
[1b4e1cc9303414f91535dab10f6342e1c1c6b8ac|https://github.com/apache/cassandra/commit/1b4e1cc9303414f91535dab10f6342e1c1c6b8ac]
- 3.11 -
[11cb8104facc4d3455efb73d2701fd5ba510bef1|https://github.com/apache/cassandra/commit/11cb8104facc4d3455efb73d2701fd5ba510bef1]
- 3.0 -
[0a1e900a0a042f78d7d5d6625bc98b84eb463e69|https://github.com/apache/cassandra/commit/0a1e900a0a042f78d7d5d6625bc98b84eb463e69]
was:https://issues.apache.org/jira/browse/CASSANDRA-16261?focusedCommentId=17262315&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17262315
> Prevent unbounded number of flushing tasks
> ------------------------------------------
>
> Key: CASSANDRA-16261
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16261
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: Ekaterina Dimitrova
> Assignee: Ekaterina Dimitrova
> Priority: Normal
> Fix For: 3.0.x, 3.11.x, 4.0-beta
>
>
> The cleaner thread is not prevented from queueing an unbounded number of
> flushing tasks for memtables that are almost empty.
> This patch adds a mechanism to track the number of pending flushing
> tasks in the memtable cleaner. Above the maximum number (2x the flushing
> threads by default), only memtables using at least MCT memory will be
> flushed, where MCT stands for Memory Cleanup Threshold.
> This patch also fixes a possible problem tracking the memory marked as
> "reclaiming" in the memtable allocators and pool. Writes that complete
> only after a memtable has been scheduled for flushing, did not report
> their memory as reclaiming. Normally this should be a small value of no
> consequence, but if the flushing tasks are blocked for a long period,
> and there is a sufficient number of writes, or these writes use
> a sufficiently large quantity of memory, this would cause the memtable
> cleaning algorithm to schedule repeated flushing tasks because the used
> memory is always > reclaiming memory + MCT.
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