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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1597) Batched edit log syncs can reset synctxid throw assertions
Date Mon, 07 Feb 2011 19:39:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1597:
------------------------------

    Priority: Blocker  (was: Critical)

Bumping to blocker priority. This bug also causes a >3x performance regression in NNThroughputBenchmark
due to lost opportunities to batch syncs

> Batched edit log syncs can reset synctxid throw assertions
> ----------------------------------------------------------
>
>                 Key: HDFS-1597
>                 URL: https://issues.apache.org/jira/browse/HDFS-1597
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1597.txt, illustrate-test-failure.txt
>
>
> The top of FSEditLog.logSync has the following assertion:
> {code}
>         assert editStreams.size() > 0 : "no editlog streams";
> {code}
> which should actually come after checking to see if the sync was already batched in by
another thread.
> This is related to a second bug in which the same case causes synctxid to be reset to
0

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