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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-20411) Ameliorate MutableSegment synchronize
Date Mon, 16 Apr 2018 18:33:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-20411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439840#comment-16439840
] 

stack edited comment on HBASE-20411 at 4/16/18 6:32 PM:
--------------------------------------------------------

2.simple.patch.69074.lock.svg is what our locking profile looks like after this patch has
been applied. Blocking on MutableSegment has been removed. We are left with the Semaphore
on RPC scheduling and mvcc completion (This makes our locking profile looks like 1.2.7 again
<= This statement is wrong; in 1.2.7 our locking profile does not have the rpc semaphore;
it has the mvcc completion and then a bunch of blocking in dfsclient that we don't have in
2.0.0).

Not much by way of perf improvement after this goes in.


was (Author: stack):
2.simple.patch.69074.lock.svg is what our locking profile looks like after this patch has
been applied. Blocking on MutableSegment has been removed. We are left with the Semaphore
on RPC scheduling and mvcc completion (This makes our locking profile looks like 1.2.7 again).
Not much by way of perf improvement though.

> Ameliorate MutableSegment synchronize
> -------------------------------------
>
>                 Key: HBASE-20411
>                 URL: https://issues.apache.org/jira/browse/HBASE-20411
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Major
>         Attachments: 2.load.patched.17704.lock.svg, 2.load.patched.2.17704.lock.svg,
2.more.patch.12010.lock.svg, 41901.lock.svg, HBASE-20411.branch-2.0.001.patch, HBASE-20411.branch-2.0.002.patch,
HBASE-20411.branch-2.0.003.patch, HBASE-20411.branch-2.0.004.patch, HBASE-20411.branch-2.0.005.patch,
HBASE-20411.branch-2.0.006.patch, HBASE-20411.branch-2.0.007.patch
>
>
> This item is migrated from HBASE-20236 so it gets dedicated issue.
> Let me upload evidence that has this synchronize as a stake in our write-time perf. I'll
migrate the patch I posted with updates that come of comments posted by [~mdrob] on the HBASE-20236
issue.



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