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Posted to common-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2013/09/04 19:30:52 UTC
[jira] [Updated] (HADOOP-9932) Name node crashes due to improper
synchronization in RetryCache
[ https://issues.apache.org/jira/browse/HADOOP-9932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kihwal Lee updated HADOOP-9932:
-------------------------------
Attachment: HADOOP-9932.patch
Attaching a patch that adds synchronizations in LightWeightCache.
> Name node crashes due to 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
> Priority: Blocker
> Attachments: 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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