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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6604) The short-circuit cache doesn't correctly time out replicas that haven't been used in a while
Date Mon, 30 Jun 2014 21:19:28 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-6604:
--------------------------------

    Hadoop Flags: Reviewed

+1 for the patch, pending Jenkins run.  I just clicked Submit Patch.  Thank you for tuning
the test, and nice find on the mmap timeout issue too.

> The short-circuit cache doesn't correctly time out replicas that haven't been used in
a while
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6604
>                 URL: https://issues.apache.org/jira/browse/HDFS-6604
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.4.0
>         Environment: Centos 6.5 and distribution Hortonworks Data Platform v2.1
>            Reporter: Giuseppe Reina
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>         Attachments: HDFS-6604.001.patch, HDFS-6604.002.patch
>
>
> When HDFS shortcircuit is enabled, the file descriptors of the deleted HDFS blocks are
kept open until the cache is full. This prevents the operating system to free the space on
disk. 
> More details on the [mailing list thread|http://mail-archives.apache.org/mod_mbox/hbase-user/201406.mbox/%3CCAPjB-CA3RV=SLhUHwUE5CV3PC4+rFfz10-TkYdBfS9RT2DeKPw@mail.gmail.com%3E]



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