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https://issues.apache.org/jira/browse/HDFS-14703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17380757#comment-17380757
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Konstantin Shvachko commented on HDFS-14703:
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??Shall I raise separate Jira for Create and trace the PR???
Yes please let's track {{create}} in a new jira. You can make it a subtask of
this jira and follow [the standard
process|https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute].
??Just provided work-around to continue, we shall work on it and eventually
optimize it better.??
It is fine as a work around, but yes we should and it would be good to design
it early, as it may effect the structure of the entire implementation. A short
design doc on the subject would be nice to have if you got any ideas.
> NameNode Fine-Grained Locking via Metadata Partitioning
> -------------------------------------------------------
>
> Key: HDFS-14703
> URL: https://issues.apache.org/jira/browse/HDFS-14703
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Reporter: Konstantin Shvachko
> Priority: Major
> Attachments: 001-partitioned-inodeMap-POC.tar.gz,
> 002-partitioned-inodeMap-POC.tar.gz, 003-partitioned-inodeMap-POC.tar.gz,
> NameNode Fine-Grained Locking.pdf, NameNode Fine-Grained Locking.pdf
>
>
> We target to enable fine-grained locking by splitting the in-memory namespace
> into multiple partitions each having a separate lock. Intended to improve
> performance of NameNode write operations.
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