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https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866515#action_12866515
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Todd Lipcon commented on HDFS-1148:
-----------------------------------
YCSB output (same test setup as described in HDFS-941). This test is run with
the HDFS-941 improvements plus FSDataset being converted to a readwrite lock.
[OVERALL],RunTime(ms), 94325
[OVERALL],Throughput(ops/sec), 10601.643254704479
[READ], Operations, 1000000
[READ], AverageLatency(ms), 3.747273
[READ], MinLatency(ms), 0
[READ], MaxLatency(ms), 1360
[READ], 95thPercentileLatency(ms), 10
[READ], 99thPercentileLatency(ms), 15
[READ], Return=0, 1000000
> Convert FSDataset to ReadWriteLock
> ----------------------------------
>
> Key: HDFS-1148
> URL: https://issues.apache.org/jira/browse/HDFS-1148
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
>
> In benchmarking HDFS-941 I noticed that for the random read workload, the
> FSDataset lock is highly contended. After converting it to a
> ReentrantReadWriteLock, I saw a ~25% improvement on both latency and
> ops/second.
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