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https://issues.apache.org/jira/browse/CASSANDRA-9662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617141#comment-14617141
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Benedict commented on CASSANDRA-9662:
-------------------------------------
Looking at the linked CASSANDRA-5554, it appears to only partially address
this, by ensuring there is always at least one submission for any CF. However
it still permits an abitrary number to be submitted, and with many concurrent
compactors makes no effort to ensure remotely fair distribution. If we always
submit _precisely_ one compaction, when requested, we should be in a much
better state AFAICT.
> compactionManager reporting wrong pendingtasks
> ----------------------------------------------
>
> Key: CASSANDRA-9662
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9662
> Project: Cassandra
> Issue Type: Bug
> Components: API
> Environment: OS: Amazon Linux AMI release 2015.03
> Cassandra: 2.0.16
> JVM: Java HotSpot(TM) 64-Bit Server VM (25.40-b25, mixed mode)
> Java: version 1.8.0_40, vendor Oracle Corporation
> CPU: 8 core Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
> Memory: 32G
> Reporter: Tony Xu
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 2.0.x
>
> Attachments: node1.jpg
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Yesterday I upgraded my Cassandra cluster from 2.0.14 to 2.0.16, after
> upgrade, I am start seeing some strange behaviours of "PendingTasks"
> reporting.
> The Cassandra repository I am using is datastax, steps I performed for
> upgrade:
> yum update -y cassandra20
> The upgrade went fine, after upgrade cluster is operating okay. "nodetool
> info and nodetool status" results looked fine. "nodetool version" is
> reporting the correct version.
> But our monitoring system start reporting some crazy "pendingtasks". For
> example, "pending taks" for node1 sometimes jump from 0 to 15K for about 1
> minute, then drop back to 0. This issue keeps occurring, didn't have this
> issue with 2.0.14. Our monitoring system is checking the value of "MBeans" ->
> "CompactionManager" -> "PendingTasks".
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