[jira] [Updated] (CASSANDRA-9637) CFS selectAndReference Blocks for Compaction

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-9637?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Yeschenko updated CASSANDRA-9637:
-----------------------------------------
    Reviewer: Aleksey Yeschenko

> CFS selectAndReference Blocks for Compaction
> --------------------------------------------
>
>                 Key: CASSANDRA-9637
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9637
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Russell Alexander Spitzer
>            Assignee: Benedict
>             Fix For: 2.1.x
>
>
> The Spark Cassandra Connector uses dsecribe_splits_ex to deterimine token information about the C* cluster. On 2.1.4 this behaves normally and responds in a few milliseconds. On 2.1.5 the function blocks while compaction is running which basically makes the function unusable. Under the hood this function access sstable information using selectAndReference. A debugging session led us to determine that the error occurred because the code would simply spin (unable to gain references to compacting tables) while compaction was happening.
> A fix was tested and proposed:
> https://github.com/belliottsmith/cassandra/tree/fix-spinning



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