cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-658) Hinted Handoff CF contention
Date Fri, 01 Jan 2010 04:02:29 GMT


Jonathan Ellis updated CASSANDRA-658:

    Attachment:     (was: 0003-remove-atomic-size-from-sc.txt)

> Hinted Handoff CF contention
> ----------------------------
>                 Key: CASSANDRA-658
>                 URL:
>             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
>            Assignee: Jonathan Ellis
>             Fix For: 0.9
>         Attachments: 0001-use-throughput-and-op-count-instead-of-size-and-column.txt,
0002-replace-sharded-row-locks-with-column-level-locking.txt, 0003-r-m-unused-code.txt
> 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 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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message