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From "Chen Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10862) LCS repair: compact tables before making available in L0
Date Fri, 17 Jun 2016 19:01:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336712#comment-15336712
] 

Chen Shen commented on CASSANDRA-10862:
---------------------------------------

Thank you [~pauloricardomg]!, I will address your comments with a new patch soon.

> LCS repair: compact tables before making available in L0
> --------------------------------------------------------
>
>                 Key: CASSANDRA-10862
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10862
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Compaction, Streaming and Messaging
>            Reporter: Jeff Ferland
>            Assignee: Chen Shen
>
> When doing repair on a system with lots of mismatched ranges, the number of tables in
L0 goes up dramatically, as correspondingly goes the number of tables referenced for a query.
Latency increases dramatically in tandem.
> Eventually all the copied tables are compacted down in L0, then copied into L1 (which
may be a very large copy), finally reducing the number of SSTables per query into the manageable
range.
> It seems to me that the cleanest answer is to compact after streaming, then mark tables
available rather than marking available when the file itself is complete.



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