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Yu Li commented on HBASE-16698:
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The JIRA here introduced mvcc preassign feature, but only implement for
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Yu Li commented on HBASE-16698:
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HBASE-17482 is a fix for master branch with the same way as stated in
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Yu Li commented on HBASE-16698:
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Will do below actions soon:
1. Close this JIRA since all codes already
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Yu Li commented on HBASE-16698:
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After some review of the mechanism, let me further explain about the
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Hadoop QA commented on HBASE-16698:
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stack commented on HBASE-16698:
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On HBASE-3899, I remembered it as an experiment that was never finished
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Yu Li commented on HBASE-16698:
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bq. Lets not backport to 1.2 until it in 1.3. Thats how we generally do
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stack commented on HBASE-16698:
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Reinstitute hbase-3899?
> Performance issue: handlers stuck waiting for
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stack commented on HBASE-16698:
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[~enis] you think we could park 'context' in the log, let the handler go
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stack commented on HBASE-16698:
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bq. On master, when I do a jstack with some load, almost all the handlers
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Enis Soztutar commented on HBASE-16698:
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On master, when I do a jstack with some load, almost all
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stack commented on HBASE-16698:
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Lets not backport to 1.2 until it in 1.3. Thats how we generally do it.
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Yu Li commented on HBASE-16698:
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Thanks for the confirmation [~mantonov]
> Performance issue: handlers
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Yu Li commented on HBASE-16698:
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Thanks for the question [~enis], the above numbers are against branch-1
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Enis Soztutar commented on HBASE-16698:
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Time to resolve this?
[~carp84] thanks for the
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Hudson commented on HBASE-16698:
SUCCESS: Integrated in Jenkins build HBase-1.4 #482 (See
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stack commented on HBASE-16698:
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Makes sense [~mantonov]
> Performance issue: handlers stuck waiting for
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Mikhail Antonov commented on HBASE-16698:
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[~stack] [~carp84] after testing on my side I think
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Yu Li commented on HBASE-16698:
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Thank you sir [~stack], I've just pushed it into branch-1 :-)
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stack commented on HBASE-16698:
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+1 on push to branch-1. Let me know if you want me to do it for you
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Yu Li commented on HBASE-16698:
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[~stack] mind if I push this to branch-1(branch-1.4) first to avoid
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Yu Li commented on HBASE-16698:
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Perf data for one single region:
Test environment (nothing changed but no
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stack commented on HBASE-16698:
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[~carp84] points out above that WALPE doesn't exercise this patch AT ALL
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Hudson commented on HBASE-16698:
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #1810 (See
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Yu Li commented on HBASE-16698:
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I also have no idea why we introduce the findbugs issue, will also take a
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Yu Li commented on HBASE-16698:
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Thanks [~stack] for opening the sub issue.
Regarding WALPE test, mind
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Hadoop QA commented on HBASE-16698:
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stack commented on HBASE-16698:
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Ok on my suggestion actually making for a larger patch when I thought it
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stack commented on HBASE-16698:
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I revert the revert of this change from master (so the master patch and
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stack commented on HBASE-16698:
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Numbers looks good.
> Performance issue: handlers stuck waiting for
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Yu Li commented on HBASE-16698:
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Ok, here are more performance number with YCSB. First the testing
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Yu Li commented on HBASE-16698:
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Thanks for coming back sir [~stack] :-)
bq. what if you added a new
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stack commented on HBASE-16698:
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[~allan163] Thanks for the questions
[~carp84] So, story is clearer now
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stack commented on HBASE-16698:
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Let me answer [~enis] I just went through this issue again and the patch.
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Yu Li commented on HBASE-16698:
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Thanks for the quick feedback [~chenheng].
The previous decision is for
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Yu Li commented on HBASE-16698:
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Current process of {{doMiniBatchMutation}} for branch-1 is like:
1.
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Heng Chen commented on HBASE-16698:
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patch for branch-1 LGTM. +1
We will open it by default on
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Heng Chen commented on HBASE-16698:
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{quote}
so in my analysis, waiting for sync and waiting for latch
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Allan Yang commented on HBASE-16698:
Yes, I know sync operation will batch as many as possible. When
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Yu Li commented on HBASE-16698:
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{quote}
Update patch for branch-1 after code rebase. Also make it able to
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Yu Li commented on HBASE-16698:
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Actually we won't sync one by one, but sync a bunch at a time, or say we
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Allan Yang commented on HBASE-16698:
After, carefully reviewed the code of branch-1.2, I understand
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Hadoop QA commented on HBASE-16698:
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Yu Li commented on HBASE-16698:
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[~allan163] and [~enis], please let me know whether my explanation address
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Hudson commented on HBASE-16698:
SUCCESS: Integrated in Jenkins build HBase-Trunk_matrix #1787 (See
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Enis Soztutar commented on HBASE-16698:
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The other thing is that we cannot maintain two different
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Enis Soztutar commented on HBASE-16698:
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I also have a hard time understanding the patch. We are
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Yu Li commented on HBASE-16698:
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And I'd say the previously existed {{cell.getSequenceId() == 0}} check in
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stack commented on HBASE-16698:
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Pardon me. Was looking in master branch.
Let me revert this patch from
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binlijin commented on HBASE-16698:
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I find master branch-1.2 branch-1.1 they are all different.
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binlijin commented on HBASE-16698:
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There is no problem for master version, only some of the branch-1
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Allan Yang commented on HBASE-16698:
The CountDownLatch can't be moved since we need to wait until
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binlijin commented on HBASE-16698:
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a forked 1.1.2 version.
> Performance issue: handlers stuck
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Heng Chen commented on HBASE-16698:
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I think [~allan163] you are right.
It is different between
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Allan Yang commented on HBASE-16698:
{code}
//
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stack commented on HBASE-16698:
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bq. Why handlers stuck at CountDownLatch?
They are waiting on sync
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Hudson commented on HBASE-16698:
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #1782 (See
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stack commented on HBASE-16698:
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Committed below addendum to address this FindBugs complaint:
Code
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Hudson commented on HBASE-16698:
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #1780 (See
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Yu Li commented on HBASE-16698:
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Thanks for review [~chenheng], sure will upload numbers for
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Yu Li commented on HBASE-16698:
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Thanks for revisiting this [~stack]
Yes sir, we're running w/ this in
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Heng Chen commented on HBASE-16698:
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Numbers seems 20 regions on one RS. If you have time, please
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stack commented on HBASE-16698:
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So, [~carp84], you running w/ this in production? I should apply this to
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Hadoop QA commented on HBASE-16698:
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Yu Li commented on HBASE-16698:
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btw, this testing is against latest code of branch-1, not master
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Yu Li commented on HBASE-16698:
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This is a common workload and nothing special, I hope this simple result
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Yu Li commented on HBASE-16698:
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Ok, here is the result with a single RS and PE tool, with below command:
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Heng Chen commented on HBASE-16698:
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{quote}
so the main problem is sequential appends and the logic
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Yu Li commented on HBASE-16698:
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I don't have much benchmarking number at hand, but from our online cluster
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Heng Chen commented on HBASE-16698:
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How much the performance will be downgrade when ops are just for
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Yu Li commented on HBASE-16698:
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bq. Why not? If a false positive and you can't clean it up...
Because
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stack commented on HBASE-16698:
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On the patch, I'd be good w/ it going in as off by default in branch-1 and
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stack commented on HBASE-16698:
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bq. but I don't think it's a good idea doing the same thing for
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Yu Li commented on HBASE-16698:
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Checked below failed UT cases in HadoopQA report and confirmed all could
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Yu Li commented on HBASE-16698:
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ok, so firstly set per-table is an option not necessity, it's just like
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Hadoop QA commented on HBASE-16698:
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Hadoop QA commented on HBASE-16698:
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binlijin commented on HBASE-16698:
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I think set per-table is not a good idea, because all regions in a
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Yu Li commented on HBASE-16698:
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btw, will try to get some perf comparison data through YCSB benchmark
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Yu Li commented on HBASE-16698:
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bq. So no speed up if one region only on a regionserver. Ok. I buy it.
Yes
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stack commented on HBASE-16698:
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bq. So all CountDownLatch are released in sequential, no parallelism...
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Yu Li commented on HBASE-16698:
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bq. So, why is this patch faster? In current implementation, contention is
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stack commented on HBASE-16698:
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bq. Previously the CountDownLatch will be released one by one due to
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Elliott Clark commented on HBASE-16698:
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If mvcc isn't the same order as the wal log order then
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Yu Li commented on HBASE-16698:
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grep "CountDownLatch.await" in the jstack and we could see 98 handlers
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Yu Li commented on HBASE-16698:
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Thanks for chiming in boss [~stack] :-)
bq. Yes, intentionally one-by-one
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stack commented on HBASE-16698:
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Oh. Saw the patch. Why is this faster? I see an added reentrant lock.
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stack commented on HBASE-16698:
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Thank you for digging in here [~carp84].
This bit I don't follow
bq.
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