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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-15046) Perf test doing all mutation steps under row lock
Date Tue, 05 Jan 2016 09:46:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082733#comment-15082733
] 

Heng Chen edited comment on HBASE-15046 at 1/5/16 9:45 AM:
-----------------------------------------------------------

{quote}
not sure why reads would be faster but 95/5 seems a tad slower (in middle is an aborted run
– the patch seems to bring on mvcc lockup... need to look into that).
{quote}
Did all read requests happen on the latest inserted rows? what's the requestdistribution param,
uniform, zipfian or latest ?


was (Author: chenheng):
{quote}
not sure why reads would be faster but 95/5 seems a tad slower (in middle is an aborted run
– the patch seems to bring on mvcc lockup... need to look into that).
{quote}
Is all read requests happens on latest inserted rows? what's the requestdistribution param,
uniform, zipfian or latest ?

> Perf test doing all mutation steps under row lock
> -------------------------------------------------
>
>                 Key: HBASE-15046
>                 URL: https://issues.apache.org/jira/browse/HBASE-15046
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Performance
>            Reporter: stack
>            Assignee: stack
>         Attachments: 1.2.svg, 1.2.v2.svg, 50threads_ycsb.png, all_under_lock.patch, all_under_lock.svg,
call_times_0-1_and_1-3_ycsb.png, latencies.png, writes.png
>
>
> This issue is about perf testing a redo of the write pipeline so that rather than:
> * take rowlock
> * start mvcc
> * append to WAL
> * add to memstore
> * sync WAL
> * let go of rowlock
> * finish up mvcc
> instead.... try...
> * take rowlock
> * start mvcc
> * append to WAL
> * sync WAL
> * add to memstore
> * finish up mvcc
> * let go of rowlock
> The latter is more straight-forward undoing need of rolling back memstore if all does
not succeed.
> It might be slower though. This issue is a look-see/try it.
> The redo will also help address the parent issue in a more general way so we can do without
the special-casing done for branch-1.0 and branch-1.1 done in a sibling subtask.
> Other benefits are that the current write pipeline is copy/pasted in a few places  --
in append, increment and checkand* -- and a refactor will allow us to fix this duplication.



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