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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16890) Analyze the performance of AsyncWAL and fix the same
Date Thu, 07 Dec 2017 04:09:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16281305#comment-16281305

stack commented on HBASE-16890:

Comparing one client with a few threads (6) against a remote, single regionserver that is
running on a HDFS of seven datanodes, I see async as slower. For workload a (50/50) its 4633
for old WAL vs 2812 for async ops/second.

echo "`date` 50/50 workload a"
time "${YCSB}" run "${BINDING}" -P "${WORKLOADS}/workloada" "${WORKLOAD_ARGS[@]}" -p recordcount=0
-p operationcount=${INSERT_COUNT} \
  -p exportfile="${LOGS}/ycsb-workloada-measurements-${HERE}-${date}.json" -p exporter="${EXPORTER}"
  >"${LOGS}/ycsb-workloada-${HERE}-${date}.out" 2>"${LOGS}/ycsb-workloada-${HERE}-${date}.err"

6 Clients/Threads.

I've not spent any time digging in on why the big diff. Pasting this here while I rerun my
test and do a bit of study as it runs...

> Analyze the performance of AsyncWAL and fix the same
> ----------------------------------------------------
>                 Key: HBASE-16890
>                 URL: https://issues.apache.org/jira/browse/HBASE-16890
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 2.0.0-beta-1
>         Attachments: AsyncWAL_disruptor.patch, AsyncWAL_disruptor_1 (2).patch, AsyncWAL_disruptor_3.patch,
AsyncWAL_disruptor_3.patch, AsyncWAL_disruptor_4.patch, AsyncWAL_disruptor_6.patch, HBASE-16890-rc-v2.patch,
HBASE-16890-rc-v3.patch, HBASE-16890-remove-contention-v1.patch, HBASE-16890-remove-contention.patch,
Screen Shot 2016-10-25 at 7.34.47 PM.png, Screen Shot 2016-10-25 at 7.39.07 PM.png, Screen
Shot 2016-10-25 at 7.39.48 PM.png, Screen Shot 2016-11-04 at 5.21.27 PM.png, Screen Shot 2016-11-04
at 5.30.18 PM.png, async.svg, classic.svg, contention.png, contention_defaultWAL.png, ycsb_FSHlog.vs.Async.png
> Tests reveal that AsyncWAL under load in single node cluster performs slower than the
Default WAL. This task is to analyze and see if we could fix it.
> See some discussions in the tail of JIRA HBASE-15536.

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