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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4533) Multithreaded cache saving can skip caches
Date Mon, 20 Aug 2012 20:33:38 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yuki Morishita updated CASSANDRA-4533:
--------------------------------------

    Attachment: 4533-1.1.txt

Attaching patch against 1.1 branch.
Caches are grobal since 1.1, so I used CacheType as key for flushInProgerss concurrent set.
                
> 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
>
>         Attachments: 4533-1.1.txt
>
>
> 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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