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Posted to commits@cassandra.apache.org by "Zhu Han (JIRA)" <ji...@apache.org> on 2012/08/15 08:16:38 UTC
[jira] [Comment Edited] (CASSANDRA-4533) Multithreaded cache saving
can skip caches
[ https://issues.apache.org/jira/browse/CASSANDRA-4533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434830#comment-13434830 ]
Zhu Han edited comment on CASSANDRA-4533 at 8/15/12 5:15 PM:
-------------------------------------------------------------
Is it possible to fix it also in 1.0?
was (Author: hanzhu):
Is it possible that it is fixed also in 1.0?
> Multithreaded cache saving can skip caches
> ------------------------------------------
>
> Key: CASSANDRA-4533
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4533
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.0
> Reporter: Zhu Han
> Assignee: Yuki Morishita
> Priority: Trivial
> Fix For: 1.1.5
>
>
> Cassandra flushes the key and row cache to disk periodically. It also uses a atomic flag in flushInProgress to enforce single cache writer at any time.
> However, the cache saving task could be submitted to CompactionManager concurrently, as long as the number of worker thread in CompactionManager is larger than 1.
> Due to the effect of above atomic flag, only one cache will be written out to disk. Other writer are cancelled when the flag is true.
> I observe the situation in Cassandra 1.0. If nothing is changed, the problem should remain in Cassandra 1.1, either.
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