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https://issues.apache.org/jira/browse/HBASE-20411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439840#comment-16439840
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stack edited comment on HBASE-20411 at 4/16/18 6:34 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 (It does
not show in this svg and in jfr, it no longer shows up in events or in
'contention' list). 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 throughput 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 <= 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 throughput improvement after this goes in.
> 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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