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https://issues.apache.org/jira/browse/HDFS-14703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17378314#comment-17378314
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Konstantin Shvachko commented on HDFS-14703:
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Great progress [~prasad-acit]. It proves the concept works for creates as well.
I liked that your changes are all confined in internal classes like
FSDirectory. Noticed that you implemented {{getInode(id)}} by iterating through
all inodes. This is probably the key part of this effort. We should eventually
replace {{getInode(id)}} with {{getInode(key)}} to make the inode lookup
efficient.
But hey you still got 25% boost.
> 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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