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https://issues.apache.org/jira/browse/HADOOP-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494603
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Hairong Kuang commented on HADOOP-1205:
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I did not realize that blocksMap is protected by a global lock. I do not think
that this is a good approach to ensure a structure integrity by acquiring a
global lock. But anyway I can change my patch to acquire a global lock. But
there are some non-public methods in FSNamesystem that do not acquire a global
lock but access blocksMap. Shall we fix them?
> The open method of FSNamesystem should be synchronized
> ------------------------------------------------------
>
> Key: HADOOP-1205
> URL: https://issues.apache.org/jira/browse/HADOOP-1205
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.2
> Reporter: Hairong Kuang
> Priority: Blocker
> Fix For: 0.13.0
>
> Attachments: open.patch
>
>
> Method open accesses a shared data structure blockMap. If synchronization
> access is not enforced, open might return inconsistent results.
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