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From "Appy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17324) PE Write workload results are wrong
Date Sun, 18 Dec 2016 12:06:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15758735#comment-15758735
] 

Appy commented on HBASE-17324:
------------------------------

Or better yet, have a flag for it?
--writebuffer=X, if X = 0, disable buffer.

Will also let users try different buffer sizes.
Will still need fixing current problem.

> PE Write workload results are wrong
> -----------------------------------
>
>                 Key: HBASE-17324
>                 URL: https://issues.apache.org/jira/browse/HBASE-17324
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Appy
>
> [~jmspaggi]  found this issue of write latencies being unreasonable.
> The reason is, we are using BufferedMutator with size 2MB, so most writes return very
quick because they get buffered. That's giving us avg. latency like 39us. Needs fixing.
> {noformat}
> 16/12/14 12:46:04 INFO hbase.PerformanceEvaluation: Latency (us) : mean=39,37, min=2,00,
max=27193408,00, stdDev=3443,01, 50th=2,00, 75th=2,00, 95th=3,00, 99th=5,00, 99.9th=9157,00,
99.99th=39685,59, 99.999th=160751,28
> 16/12/14 12:46:04 INFO hbase.PerformanceEvaluation: Num measures (latency) : 100000000
> 16/12/14 12:46:04 INFO hbase.PerformanceEvaluation: Mean      = 39,37
> Min       = 2,00
> Max       = 27193408,00
> StdDev    = 3443,01
> 50th      = 2,00
> 75th      = 2,00
> 95th      = 3,00
> 99th      = 5,00
> 99.9th    = 9157,00
> 99.99th   = 39685,59
> 99.999th  = 160751,28
> {noformat}



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