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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-21150) Avoid delay in first flushes due to contention in table metrics registration
Date Tue, 04 Sep 2018 16:02:00 GMT
Ted Yu created HBASE-21150:
------------------------------

             Summary: Avoid delay in first flushes due to contention in table metrics registration
                 Key: HBASE-21150
                 URL: https://issues.apache.org/jira/browse/HBASE-21150
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu
            Assignee: Ted Yu


After HBASE-15728 is integrated, the lazy table metrics registration results in penalty for
the first flushes.
Excerpt from log shows delay (note the same timestamp 08:18:23,234) :
{code}
2018-09-02 08:18:23,232 DEBUG [rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-2]
regionserver.MetricsTableSourceImpl(124): Creating new                      MetricsTableSourceImpl
for table 'testtb-1535901500805'
2018-09-02 08:18:23,233 DEBUG [rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-2]
regionserver.MetricsTableSourceImpl(137): registering metrics for testtb-   1535901500805
2018-09-02 08:18:23,234 INFO  [rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-1]
regionserver.HRegion(2822): Finished flush of dataSize ~2.29 KB/2343,       heapSize ~5.16
KB/5280, currentSize=0 B/0 for fa403f6a4fb8dbc1a1c389744fce2d58 in 280ms, sequenceid=5, compaction
requested=false
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52758,1535901497238)-snapshot-pool11-thread-1]
regionserver.MetricsTableAggregateSourceImpl(84): it took 6 ms to register  testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52758,1535901497238)-snapshot-pool11-thread-1,5,FailOnTimeoutGroup]
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-1]
regionserver.MetricsTableAggregateSourceImpl(84): it took 0 ms to register  testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-1,5,FailOnTimeoutGroup]
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52762,1535901497314)-snapshot-pool9-thread-1]
regionserver.MetricsTableAggregateSourceImpl(84): it took 6 ms to register   testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52762,1535901497314)-snapshot-pool9-thread-1,5,FailOnTimeoutGroup]
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52762,1535901497314)-snapshot-pool9-thread-2]
regionserver.MetricsTableAggregateSourceImpl(84): it took 6 ms to register   testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52762,1535901497314)-snapshot-pool9-thread-2,5,FailOnTimeoutGroup]
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52758,1535901497238)-snapshot-pool11-thread-2]
regionserver.MetricsTableAggregateSourceImpl(84): it took 5 ms to register  testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52758,1535901497238)-snapshot-pool11-thread-2,5,FailOnTimeoutGroup]
2018-09-02 08:18:23,234 DEBUG [rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-2]
regionserver.MetricsTableAggregateSourceImpl(84): it took 6 ms to register  testtb-1535901500805
Thread[rs(hw13463.attlocal.net,52760,1535901497280)-snapshot-pool10-thread-2,5,FailOnTimeoutGroup]
{code}
This is a regression.

When first region of the table is opened on region server, we can proactively register table
metrics.
This would avoid the penalty on first flushes for the table.



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