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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2797) HA: Add a test for the standby becoming active after a partial transaction is logged
Date Sun, 03 Jun 2012 02:53:23 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-2797:
---------------------------------------

    Attachment: HDFS-2797.001.patch
                HDFS-2797.001.patch

* add a test for the standby becoming active with a partial transaction logged

* add clearLimit method to PositionTrackingInputStream

* fix skip logic in EditLogFileInputStream.  InputStream#skip can skip less than the requested
number of bytes.  Also, it's prudent to clear any limit set in the PositionTrackingInputStream.
 It's quite possible for the end of the file to be longer than the maximum transaction length.
                
> HA: Add a test for the standby becoming active after a partial transaction is logged
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-2797
>                 URL: https://issues.apache.org/jira/browse/HDFS-2797
>             Project: Hadoop HDFS
>          Issue Type: Test
>          Components: ha, name-node
>    Affects Versions: 0.24.0
>            Reporter: Aaron T. Myers
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-2797.001.patch
>
>
> The existing failover tests only cover the case of graceful shutdown. We should make
sure the standby NN can become active even when the final transaction in an edit log is only
partially written to disk.

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