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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-724) Insert/Get Contention
Date Thu, 04 Feb 2010 19:49:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829737#action_12829737
] 

Brandon Williams commented on CASSANDRA-724:
--------------------------------------------

+1, much improved for me:

Slow insert test.15910 0.0661840438843
Slow insert test.37799 0.073842048645
Slow insert test.38254 0.0541589260101
Slow insert test.46248 0.0541749000549
Slow insert test.56482 0.0474050045013
Slow insert test.70314 0.0435261726379
Slow insert test.76370 0.0660541057587
Slow insert test.170684 0.0553348064423
Slow insert test.170685 0.0560541152954
Slow insert test.202273 0.0667309761047

I also confirmed w/verbose:gc that the long gc pauses related to compaction/deletion are gone.

> Insert/Get Contention
> ---------------------
>
>                 Key: CASSANDRA-724
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-724
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Chris Goffinet
>            Assignee: Jonathan Ellis
>             Fix For: 0.6
>
>         Attachments: 0001-decouple-periodic-sync-mode-from-commit-log-append.txt, 0002-replace-gc-after-each-compaction-w-gc-before-compactio.txt,
0003-only-gc-if-there-are-undeleted-sstables-that-gc-ing-co.txt, debug.patch, test_case.py
>
>
> We tried out the socket io patch in CASSANDRA-705, tested the latest JVM of b18 for 1.6.
Still seeing very strange insert times. We see this with get_slices as well but it's easy
to reproduce with batch_insert. I wonder if its related to Memtable contention, it's pretty
easy to see the slow times when you restart the test script attached. We are running this
on a 7 node cluster, <1% cpu. Consistency Level of 1.
> Results
> ---------------------
> Slow insert test.10882 0.203548192978
> Slow insert test.18005 0.203876972198
> Slow insert test.21154 0.204496860504
> Slow insert test.22054 0.0444049835205
> Slow insert test.26445 0.201545000076

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