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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Read latency is over 1 minute on a column family with 400,000 rows
Date Mon, 01 Aug 2011 20:55:47 GMT
You really need to upgrade from 0.8.0 to fix that.  Restarting won't
help, much (you'll get exactly one compaction against a given sstable,
before it stops working again).

On Mon, Aug 1, 2011 at 2:34 PM, myreasoner <myreasoner@gmail.com> wrote:
> All compaction related settings in the yaml were untouched.  The fingerprint
> column family has been populated three days ago and the cpu/disk usage were
> pretty low.  I'd think Cassandra will silently start the compaction thread
> on my behalf and try to preserve the min/max thresholds, rather than waiting
> for a major compaction order from nodetool explicitly.
>
> Anyway, I did a major compaction on all 5 nodes almost at the same time.  4
> of them came back after a few hours, but one of the 5 nodes still has a lot
> of pending ones:
>
> cassandra/bin/nodetool -h localhost compactionstats
> pending tasks: 76
>
> And the uptime is very light.
>  14:31:44 up 30 days, 22:11,  4 users,  load average: 0.29, 0.58, 0.58
>
> Some reply suggested this is a broken compaction.  I will wait for a few
> hours and restart that node if nothing changes.
>
> --
> View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Read-latency-is-over-1-minute-on-a-column-family-with-400-000-rows-tp6639649p6642279.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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