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Posted to user@cassandra.apache.org by Scott Dworkis <sv...@mylife.com> on 2011/07/07 02:26:50 UTC
commitlogs not draining
couple questions about commitlogs and the nodetool drain operator:
* in 0.6, after invoking a drain, the commitlog directory would be empty.
in 0.8, it seems to contain 2 files, a 44 byte .header file and 270 byte
.log file. do these indicate a fully drained commitlog?
* i have a couple nodes for which the commitlogs do not seem to be
draining at all... they remain several hundred k or meg in size. are they
corrupt? if the data is not precious, is there some way to clear and reset
them to work around this?
also, i see this in system.log:
/data/var/log/cassandra/system.log.1:DEBUG [COMMIT-LOG-WRITER] 2011-07-06
11:04:10,076 CommitLog.java (line 473) Not safe to delete commit log
CommitLogSegment(/data/var/lib/cassandra/commitlog/CommitLog-1309288064262.log);
dirty is LocationInfo (0), ; hasNext: true
-scott
Re: commitlogs not draining
Posted by Aaron Morton <aa...@thelastpickle.com>.
When you run drain the node will log someone like "node drained" when it is done.
The commit log should be empty, any data in the log may be due to changes in the system tables after the drain. Can you raise a ticket and include the commit logs left behind and any relevant log messages?
The non draining logs may be this https://issues.apache.org/jira/browse/CASSANDRA-2829 .
If a node tool flush does not clear them a restart will.
Cheers
-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 7/07/2011, at 12:26 PM, Scott Dworkis <sv...@mylife.com> wrote:
> couple questions about commitlogs and the nodetool drain operator:
>
> * in 0.6, after invoking a drain, the commitlog directory would be empty. in 0.8, it seems to contain 2 files, a 44 byte .header file and 270 byte .log file. do these indicate a fully drained commitlog?
>
> * i have a couple nodes for which the commitlogs do not seem to be draining at all... they remain several hundred k or meg in size. are they corrupt? if the data is not precious, is there some way to clear and reset them to work around this?
>
> also, i see this in system.log:
>
> /data/var/log/cassandra/system.log.1:DEBUG [COMMIT-LOG-WRITER] 2011-07-06 11:04:10,076 CommitLog.java (line 473) Not safe to delete commit log CommitLogSegment(/data/var/lib/cassandra/commitlog/CommitLog-1309288064262.log); dirty is LocationInfo (0), ; hasNext: true
>
> -scott