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Posted to common-issues@hadoop.apache.org by "Jing Zhao (JIRA)" <ji...@apache.org> on 2013/09/04 22:00:53 UTC

[jira] [Commented] (HADOOP-9932) Improper synchronization in RetryCache

    [ https://issues.apache.org/jira/browse/HADOOP-9932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758272#comment-13758272 ] 

Jing Zhao commented on HADOOP-9932:
-----------------------------------

+1 as well. Thanks for the fix Kihwal!
                
> Improper synchronization in RetryCache
> --------------------------------------
>
>                 Key: HADOOP-9932
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9932
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Blocker
>         Attachments: HADOOP-9932.patch, HADOOP-9932.patch
>
>
> In LightWeightCache#evictExpiredEntries(), the precondition check can fail. [~patwhitey2007] ran a HA failover test and it occurred while the SBN was catching up with edits during a transition to active. This caused NN to terminate.
> Here is my theory: If an RPC handler calls waitForCompletion() and it happens to remove the head of the queue in get(), it will race with evictExpiredEntries() frrom put().

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