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https://issues.apache.org/jira/browse/CASSANDRA-4174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257852#comment-13257852
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Yuki Morishita commented on CASSANDRA-4174:
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bq. starting compaction as soon as I have one sstable to work on might "smooth
out" the workload more.
Current version of cassandra adds sstables and submits compaction when finished
streaming all files, not when finished
streaming just one file. In my laptop, I bulkloaded 72 sstables to empty,
single node cassandra and triggered compaction 9 times without the patch, in
contrast to 3 times with patch applied.
> Unnecessary compaction happens when streaming
> ---------------------------------------------
>
> Key: CASSANDRA-4174
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4174
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.0.0
> Reporter: Yuki Morishita
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 1.0.10
>
> Attachments: 4174-1.0.txt
>
>
> When streaming session finishes, streamed sstabls are added to CFS one by one
> using
> ColumnFamilyStore#addSSTable(https://github.com/apache/cassandra/blob/cassandra-1.0.9/src/java/org/apache/cassandra/streaming/StreamInSession.java#L141).
> This method submits compaction in
> background(https://github.com/apache/cassandra/blob/cassandra-1.0.9/src/java/org/apache/cassandra/db/ColumnFamilyStore.java#L946),
> and end up with unnecessary compaction tasks behind.
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