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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5911) Commit logs are not removed after nodetool flush or nodetool drain
Date Fri, 08 Nov 2013 20:10:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817641#comment-13817641
] 

Jonathan Ellis commented on CASSANDRA-5911:
-------------------------------------------

Looks to me like we're still providing "best effort" cleanup after each flush based on {{allocator.numSegmentsAvailable
> 0}}.

I still think we need to *require* forcing a new segment in the drop scenario, and we don't
really care otherwise.

> Commit logs are not removed after nodetool flush or nodetool drain
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-5911
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5911
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: J.B. Langston
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 2.0.3
>
>         Attachments: 0001-5911-v2.patch, 0001-5911-v3.patch, 0001-CASSANDRA-5911.patch,
6528_140171_knwmuqxe9bjv5re_system.log
>
>
> Commit logs are not removed after nodetool flush or nodetool drain. This can lead to
unnecessary commit log replay during startup.  I've reproduced this on Apache Cassandra 1.2.8.
 Usually this isn't much of an issue but on a Solr-indexed column family in DSE, each replayed
mutation has to be reindexed which can make startup take a long time (on the order of 20-30
min).
> Reproduction follows:
> {code}
> jblangston:bin jblangston$ ./cassandra > /dev/null
> jblangston:bin jblangston$ ../tools/bin/cassandra-stress -n 20000000 > /dev/null
> jblangston:bin jblangston$ du -h ../commitlog
> 576M	../commitlog
> jblangston:bin jblangston$ nodetool flush
> jblangston:bin jblangston$ du -h ../commitlog
> 576M	../commitlog
> jblangston:bin jblangston$ nodetool drain
> jblangston:bin jblangston$ du -h ../commitlog
> 576M	../commitlog
> jblangston:bin jblangston$ pkill java
> jblangston:bin jblangston$ du -h ../commitlog
> 576M	../commitlog
> jblangston:bin jblangston$ ./cassandra -f | grep Replaying
>  INFO 10:03:42,915 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566761.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566762.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566763.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566764.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566765.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566766.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566767.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566768.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566769.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566770.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566771.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566772.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566773.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566774.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566775.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566776.log, /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566777.log,
/opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566778.log
>  INFO 10:03:42,922 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566761.log
>  INFO 10:03:43,907 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566762.log
>  INFO 10:03:43,907 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566763.log
>  INFO 10:03:43,907 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566764.log
>  INFO 10:03:43,908 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566765.log
>  INFO 10:03:43,908 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566766.log
>  INFO 10:03:43,908 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566767.log
>  INFO 10:03:43,909 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566768.log
>  INFO 10:03:43,909 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566769.log
>  INFO 10:03:43,909 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566770.log
>  INFO 10:03:43,910 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566771.log
>  INFO 10:03:43,910 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566772.log
>  INFO 10:03:43,911 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566773.log
>  INFO 10:03:43,911 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566774.log
>  INFO 10:03:43,911 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566775.log
>  INFO 10:03:43,912 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566776.log
>  INFO 10:03:43,912 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566777.log
>  INFO 10:03:43,912 Replaying /opt/apache-cassandra-1.2.8/commitlog/CommitLog-2-1377096566778.log
> {code}



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