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https://issues.apache.org/jira/browse/HDFS-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tanping Wang updated HDFS-1648:
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Attachment: HDFS-1648.patch
> Federation: Properly release in_use.lock created in BlockPoolStorage
> ---------------------------------------------------------------------
>
> Key: HDFS-1648
> URL: https://issues.apache.org/jira/browse/HDFS-1648
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: Federation Branch
> Reporter: Tanping Wang
> Assignee: Tanping Wang
> Fix For: Federation Branch
>
> Attachments: HDFS-1648.patch
>
>
> StorageDirectory locks in_use.lock file, when analyzeStorage() method is
> called during
> initialization.
> Since BlockPoolStorage uses this method, an in_use.lock file is created and
> locked under BlockPool directory
> <StorageDirectory>/current/bpid/. This lock is not released when datanode
> shutsdown. Restarting datanode without
> formatting it results in datanode failure to acquire in_use.lock and hence
> failure to restart.
> in_use.lock file that currently exists in <StorageDirectory> (at the datanode
> level) is sufficient to prevent two
> instances of datanodes running on the same node. There is no need for such a
> lock in block pool directories.
> Change is needed so that BlockPoolStorage can disable locking when it creates
> it's StorageDirectory.
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