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https://issues.apache.org/jira/browse/HADOOP-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494420
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Raghu Angadi commented on HADOOP-1205:
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Other modifications to blocksMap don't lock blocksMap. Many places the the
access is under global FSNamesystem lock. But not all accesses to blocksMap is
under lock. We will need to fix all of them, possibly by moving it under global
lock.
I am not sure if the patch fixes any issue. Can you clarify why the change is
correct or helps?
> 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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