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https://issues.apache.org/jira/browse/HDFS-14703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17346379#comment-17346379
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Konstantin Shvachko commented on HDFS-14703:
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Thanks [~prasad-acit] and [~xinglin] for benchmarking. Very glad you guys could
independently confirm 30-45% improvement.
I think the PartitionedGSet implementation should benefit from both *_more
cores_* and *_faster storage device_* for edits. For storage device NVME SSDs
perform the best for journaling type workloads in our experience.
Also please take into account this is only a POC patch. Theoretically, we
should be able to scale performance proportionally to the number of cores and
partitions in the GSet given we are not IO bound.
> 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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