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Posted to issues@hbase.apache.org by "Yu Li (JIRA)" <ji...@apache.org> on 2016/01/25 07:16:39 UTC
[jira] [Commented] (HBASE-11586) HFile's HDFS op latency sampling
code is not used
[ https://issues.apache.org/jira/browse/HBASE-11586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114814#comment-15114814 ]
Yu Li commented on HBASE-11586:
-------------------------------
Have filed HBASE-15160 to put back HDFS op latency sampling and add metrics for monitoring. [~apurtell] could you help review? Thanks.
> 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
> Assignee: Andrew Purtell
> Fix For: 0.99.0, 0.98.5, 2.0.0
>
> Attachments: HBASE-11586.patch, HBASE-11586.patch
>
>
> HFileReaderV2 calls HFile#offerReadLatency and HFileWriterV2 calls HFile#offerWriteLatency but the samples are never retrieved. 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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