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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6229) Race condition in failover can cause RetryCache fail to work
Date Thu, 10 Apr 2014 20:10:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-6229:
----------------------------

    Status: Patch Available  (was: Open)

> Race condition in failover can cause RetryCache fail to work
> ------------------------------------------------------------
>
>                 Key: HDFS-6229
>                 URL: https://issues.apache.org/jira/browse/HDFS-6229
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.1.0-beta
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-6229.000.patch, retrycache-race.patch
>
>
> Currently when NN failover happens, the old SBN first sets its state to active, then
starts the active services (including tailing all the remaining editlog and building a complete
retry cache based on the editlog). If a retry request, which has already succeeded in the
old ANN (but the client fails to receive the response), comes in between, this retry may still
get served by the new ANN but miss the retry cache.



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