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https://issues.apache.org/jira/browse/CASSANDRA-5605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705442#comment-13705442
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Ananth Gundabattula commented on CASSANDRA-5605:
------------------------------------------------
Am not sure if the following information helps but we too hit this issue in
production today. We were running with cassandra 1.2.4 and two patches
CASSANDRA-5554 & CASSANDRA-5418.
We were running with RF=3 and LCS.
We cross checked using JMX if blacklisting is the cause of this bug and it
looks like it is definitely not the case.
We however saw a pile up of pending compactions ~ 1800 pending compactions per
node when node crashed. Surprising thing is that the "Insufficient disk space
to write xxxx bytes" appears much before the node crashes. For us it started
appearing aprrox 3 hours before the node crashed.
The cluster which showed this behavior was having loads of writes occurring (
We were using multiple SSTableLoaders to stream data into this cluster. ). We
pushed in almost 15 TB worth data ( including the RF =3 ) in a matter of 16
hours. We were not serving any reads from this cluster as we were still
migrating data to it.
Another interesting behavior observed that nodes were neighbors in most of the
time.
Am not sure if the above information helps but wanted to add it to the context
of the ticket.
> Crash caused by insufficient disk space to flush
> ------------------------------------------------
>
> Key: CASSANDRA-5605
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5605
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.3, 1.2.5
> Environment: java version "1.7.0_15"
> Reporter: Dan Hendry
>
> A few times now I have seen our Cassandra nodes crash by running themselves
> out of memory. It starts with the following exception:
> {noformat}
> ERROR [FlushWriter:13000] 2013-05-31 11:32:02,350 CassandraDaemon.java (line
> 164) Exception in thread Thread[FlushWriter:13000,5,main]
> java.lang.RuntimeException: Insufficient disk space to write 8042730 bytes
> at
> org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:42)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:722)
> {noformat}
> After which, it seems the MemtablePostFlusher stage gets stuck and no further
> memtables get flushed:
> {noformat}
> INFO [ScheduledTasks:1] 2013-05-31 11:59:12,467 StatusLogger.java (line 68)
> MemtablePostFlusher 1 32 0
> INFO [ScheduledTasks:1] 2013-05-31 11:59:12,469 StatusLogger.java (line 73)
> CompactionManager 1 2
> {noformat}
> What makes this ridiculous is that, at the time, the data directory on this
> node had 981GB free disk space (as reported by du). We primarily use STCS and
> at the time the aforementioned exception occurred, at least one compaction
> task was executing which could have easily involved 981GB (or more) worth of
> input SSTables. Correct me if I am wrong but but Cassandra counts data
> currently being compacted against available disk space. In our case, this is
> a significant overestimation of the space required by compaction since a
> large portion of the data being compacted has expired or is an overwrite.
> More to the point though, Cassandra should not crash because its out of disk
> space unless its really actually out of disk space (ie, dont consider
> 'phantom' compaction disk usage when flushing). I have seen one of our nodes
> die in this way before our alerts for disk space even went off.
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