From: Jonathan Ellis <email@example.com>
Sent: Wed, February 24, 2010 11:34:59 AM
Subject: Re: Anti-compaction Diskspace issue even when latest patch applied
as you noticed, "nodeprobe move" first unloads the data, then moves to
the new position. so that won't help you here.
If you are using replicationfactor=1, scp the data to the previous
node on the ring, then reduce the original node's token so it isn't
responsible for so much, and run cleanup. (you can do this w/ higher
RF too, you just have to scp the data more places.)
Finally, you could work onhttps://issues.apache.org/jira/browse/CASSANDRA-579
so it doesn't need
to anticompact to disk before moving data.
On Wed, Feb 24, 2010 at 12:06 PM, shiv shivaji <firstname.lastname@example.org
> According to the stack trace I get in the log, it makes it look like the
> patch was for anti-compaction but I did not look at
the source code in
> detail yet.
> java.lang.UnsupportedOperationException: disk full
> at java.util.concurrent.FutureTask.get(FutureTask.java:83)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.UnsupportedOperationException: disk full
> ... 2 more
> I tried "nodetool cleanup" before and it did not really stop the disk from
> filling, is there a way to force move the data or some other way to solve
> the issue?
> Thanks, Shiv
> From: Jonathan Ellis <email@example.com
> To: firstname.lastname@example.org
> Sent: Wed, February 24, 2010 7:16:32 AM
> Subject: Re: Anti-compaction Diskspace
issue even when latest patch applied
> The patch you refer to was to help *compaction*, not *anticompaction*.
> If the space is mostly hints for other machines (is that what you
> meant by "due to past problems with others?") you should run nodeprobe
> cleanup on it to remove data that doesn't actually belong on that
> On Wed, Feb 24, 2010 at 3:09 AM, shiv shivaji <email@example.com
>> For about 6TB of total data size with a replication factor of 2 (6TB x 2)
>> on a five node cluster, I see about 4.6 TB on one machine (due to
>> past problems with other machines). The machine has a disk of 6TB.
>> The data folder on this machine has 59,289 files totally 4.6 TB. The files
>> are the
data, filter and indexes. I see that anti-compaction is running. I
>> applied a recent patch which does not do anti-compaction if disk space is
>> limited. I still see it happening. I have also called nodetool loadbalance
>> on this machine. Seems like it will run out of disk space anyway.
>> The machine diskspace consumed are: (Each machine has a 6TB hard-drive on
>> Machine Space Consumed
>> M1 4.47 TB
>> M2 2.93 TB
>> M3 1.83 GB
>> M4 56.19 GB
>> M5 398.01 GB
>> How can I force M1 to immediately move its load to M3 and M4 for instance
>> (or any other machine). The nodetool move command moves all data, is there
>> way instead to force move 50% of data to M3 and the remaining 50% to M4
>> resume anti-compaction after the move?
>> Thanks, Shiv