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From "Philip Thompson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9657) Hint table doing unnecessary compaction
Date Mon, 29 Jun 2015 16:21:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605836#comment-14605836
] 

Philip Thompson commented on CASSANDRA-9657:
--------------------------------------------

[~iamaleksey], is this expected behavior?

> Hint table doing unnecessary compaction
> ---------------------------------------
>
>                 Key: CASSANDRA-9657
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9657
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: 2.1.7
>            Reporter: Jan Karlsson
>            Priority: Minor
>             Fix For: 2.1.x
>
>
> I found some really strange behaviour. During the replay of a node I found this in the
log:
> {code}INFO [CompactionExecutor:7] CompactionTask.java:271 Compacted 1 sstables to [/var/lib/cassandra/data/system/hints-2666e20573ef38b390fefecf96e8f0c7/system-hints-ka-120,].
 452,150,727 bytes to 452,150,727 (~100% of original) in 267,588ms = 1.611449MB/s.  1 total
partitions merged to 1.  Partition merge counts were {1:1, }{code}
> This happened multiple times until the hint replay was completed and the sstables were
removed.
> I tried to replicate this by just starting up a cluster in ccm and killing a node for
a few minutes. I got the same behaviour then.
> {Code}
> INFO  [CompactionExecutor:2] CompactionTask.java:270 - Compacted 1 sstables to [/home/ejankan/.ccm/hint/node3/data/system/hints-2666e20573ef38b390fefecf96e8f0c7/system-hints-ka-2,].
 65,570 bytes to 65,570 (~100% of original) in 600ms = 0.104221MB/s.  1 total partitions merged
to 1.  Partition merge counts were {1:1, }
> {Code}
> It seems weird to me that the file does not decrease in size.



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