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https://issues.apache.org/jira/browse/HDFS-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14371782#comment-14371782
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Anthony Hsu commented on HDFS-6599:
-----------------------------------
Thanks for the pointers, Kihwal. We'll take a look at some of those patches
and consider applying them.
BTW, we applied the patch for this ticket and noticed a significant improvement
in NameNode latency and throughput!
> 2.4 addBlock is 10 to 20 times slower compared to 0.23
> ------------------------------------------------------
>
> Key: HDFS-6599
> URL: https://issues.apache.org/jira/browse/HDFS-6599
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0, 2.4.0
> Reporter: Kihwal Lee
> Assignee: Daryn Sharp
> Priority: Blocker
> Fix For: 2.5.0
>
> Attachments: HDFS-6599.patch
>
>
> From one of our busiest 0.23 clusters:
> {panel}
> "AddBlockAvgTime" : 0.9514711501719515
> "CreateAvgTime" : 1.7564162389174
> "CompleteAvgTime" : 1.3310406035056548
> "BlockReceivedAndDeletedAvgTime" : 0.661210005151392
> {panel}
> From a not-so-busy 2.4 cluster:
> {panel}
> "AddBlockAvgTime" : 10.083333333333334
> "CreateAvgTime" : 1.0
> "CompleteAvgTime" : 1.1111111111111112
> "BlockReceivedAndDeletedAvgTime" : 0.07692307692307694
> {panel}
> When the 2.4 cluster gets a moderate amount of write requests, the latency is
> terrible. E.g. addBlock goes upward of 60ms.
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