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https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388970#comment-16388970
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Chance Li commented on HBASE-19389:
-----------------------------------
[~stack]
thanks, sir.
{quote}less throughput, but way less CPU used (better 95th percentiles, etc),
and handlers free for other tasks
{quote}
Yes sir, this is our purpose.
{quote}Would it make sense to put this limit behind a configuration gate?
{quote}
I think we need it. It is mainly for to enable us to 'remove' it , even though
we can't totally remove it because of the added counter on the path.
{quote}Also of note is how your compares show the asyncwal being slightly
better than old wal.
{quote}
Let me check again. And this async_wal is one of Durablilty types. it's not WAL.
[~carp84] ok, I will work on it.
> Limit concurrency of put with dense (hundreds) columns to prevent write
> handler exhausted
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-19389
> URL: https://issues.apache.org/jira/browse/HBASE-19389
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Affects Versions: 2.0.0
> Environment: 2000+ Region Servers
> PCI-E ssd
> Reporter: Chance Li
> Assignee: Chance Li
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: CSLM-concurrent-write.png,
> HBASE-19389-branch-2-V2.patch, HBASE-19389-branch-2-V3.patch,
> HBASE-19389-branch-2-V4.patch, HBASE-19389-branch-2-V5.patch,
> HBASE-19389-branch-2-V6.patch, HBASE-19389-branch-2-V7.patch,
> HBASE-19389-branch-2-V8.patch, HBASE-19389-branch-2.patch, metrics-1.png,
> ycsb-result.png
>
>
> In a large cluster, with a large number of clients, we found the RS's
> handlers are all busy sometimes. And after investigation we found the root
> cause is about CSLM, such as compare function heavy load. We reviewed the
> related WALs, and found that there were many columns (more than 1000 columns)
> were writing at that time.
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