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From "Simon Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-10862) LCS repair: compact tables before making available in L0
Date Wed, 14 Jun 2017 18:43:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16049505#comment-16049505
] 

Simon Zhou edited comment on CASSANDRA-10862 at 6/14/17 6:42 PM:
-----------------------------------------------------------------

[~scv119@gmail.com] Are you still working on this?


was (Author: szhou):
[~chenshen] Are you still working on this?

> 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
>              Labels: lcs
>
> 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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