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From "Jeremiah Jordan" <JEREMIAH.JOR...@morningstar.com>
Subject Re: Cassandra 1.0.0 - Node Load Bug
Date Fri, 21 Oct 2011 11:32:36 GMT
I thought this patch made it into the 1.0 release?  I remember it being referenced in one of
the re-rolls.


On Oct 20, 2011, at 9:56 PM, "Jonathan Ellis" <jbellis@gmail.com> wrote:

> That looks to me like it's reporting uncompressed size as the load.
> Should be fixed in the 1.0 branch for 1.0.1.
> (https://issues.apache.org/jira/browse/CASSANDRA-3338)
> 
> On Thu, Oct 20, 2011 at 11:53 AM, Dan Hendry <dan.hendry.junk@gmail.com> wrote:
>> I have been playing around with Cassandra 1.0.0 in our test environment it
>> seems pretty sweet so far. I have however come across what appears to be a
>> bug tracking node load. I have enabled compression and levelled compaction
>> on all CFs (scrub  + snapshot deletion) and the nodes have been operating
>> normally for a day or two. I started getting concerned when the load as
>> reported by nodetool ring kept increasing (it seems monotonically) despite
>> seeing a compression ratio of ~2.5x (as a side note, I find it strange
>> Cassandra does not provide the compression ratio via jmx or in the logs). I
>> initially thought there might be a bug in cleaning up obsolete SSTables but
>> I then noticed the following discrepancy:
>> 
>> 
>> 
>> Nodetool ring reports:
>> 
>>                 10.112.27.65    datacenter1 rack1       Up     Normal  8.64
>> GB         50.00%  170141183460469231731687303715884105727
>> 
>> 
>> 
>> Yet du . –h reports: only 2.4G in the data directory.
>> 
>> 
>> 
>> After restarting the node, nodetool ring reports a more accurate:
>> 
>> 10.112.27.65    datacenter1 rack1       Up     Normal  2.35 GB
>> 50.00%  170141183460469231731687303715884105727
>> 
>> 
>> 
>> Again, both compression and levelled compaction have been enabled on all
>> CFs. Is this a known issue or has anybody else observed a similar pattern?
>> 
>> 
>> 
>> Dan Hendry
>> 
>> (403) 660-2297
>> 
>> 
> 
> 
> 
> -- 
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
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