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From "Srikanth Srungarapu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11586) HFile's HDFS op latency sampling code is not used
Date Thu, 24 Jul 2014 22:14:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073743#comment-14073743
] 

Srikanth Srungarapu commented on HBASE-11586:
---------------------------------------------

+1 (non-binding vote).

> HFile's HDFS op latency sampling code is not used
> -------------------------------------------------
>
>                 Key: HBASE-11586
>                 URL: https://issues.apache.org/jira/browse/HBASE-11586
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.4
>            Reporter: Andrew Purtell
>             Fix For: 0.99.0, 0.98.5, 2.0.0
>
>         Attachments: HBASE-11586.patch
>
>
> HFileReaderV2 calls HFile#offerReadLatency and HFileWriterV2 calls HFile#offerWriteLatency
but the samples are never drained. There are no callers of HFile#getReadLatenciesNanos, HFile#getWriteLatenciesNanos,
and related. The three ArrayBlockingQueues we are using as sample buffers in HFile will fill
quickly and are never drained. 
> There are also no callers of HFile#getReadTimeMs or HFile#getWriteTimeMs, and related,
so we are incrementing a set of AtomicLong counters that will never be read nor reset.
> We are calling System.nanoTime in block read and write paths twice but not utilizing
the measurements.
> We should hook this code back up to metrics or remove it.
> We are also not using HFile#getChecksumFailuresCount anywhere but in some unit test code.



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