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https://issues.apache.org/jira/browse/HDFS-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HDFS-5029:
------------------------------
Attachment: HDFS-5029.2.patch
Reverted to very simple write->read lock changes in FSN.
Updated test to reflect that in combination with HADOOP-9930, both FSN read
operations and token operations for distinct tokens may execute concurrently.
Will submit patch after HADOOP-9930 is integrated.
> Token operations should not block read operations
> -------------------------------------------------
>
> Key: HDFS-5029
> URL: https://issues.apache.org/jira/browse/HDFS-5029
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-5029.2.patch, HDFS-5029.branch-23.patch,
> HDFS-5029.patch, HDFS-5029.patch
>
>
> Token operations unnecessarily obtain the write lock on the namespace. Edits
> for token operations are independent of edits for other namespace write
> operations, and the edits have no ordering requirement with respect to
> namespace changes.
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