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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-658) Hinted Handoff CF contention
Date Wed, 30 Dec 2009 02:45:29 GMT
Hinted Handoff CF contention
----------------------------

                 Key: CASSANDRA-658
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-658
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.5
         Environment: debian lenny amd64 OpenJDK 64-Bit Server VM (build 1.6.0_0-b11, mixed
mode)

            Reporter: Brandon Williams
             Fix For: 0.9


Hinted handoff causes a lot of contention on the HH CF, causing insert speed to massively
drop.  Most of the row mutation stage threads end up blocking on each other at Memtable.resolve.
 This is because HH sends the hint to the closest node, which will always be the node handling
the write.

To reproduce: start a cluster with even InitialTokens, and begin a constant stream of writes
to one node, with an even key distribution. (I used 4 nodes and stress.py in random mode.)
 Take a node down, and the insert rate begin to drop, eventually settling between 100-300/s
and sustaining there.  Bringing the down node back up will restore the original insert rate.

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