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https://issues.apache.org/jira/browse/CASSANDRA-3468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183361#comment-13183361
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Jonathan Ellis commented on CASSANDRA-3468:
-------------------------------------------
Are you using the serializing, off-heap row cache? If there is a bug where
that consumes the buffers it's serializing, that might cause this.
SerializingCacheProvider is the default if JNA is enabled, but Cassandra will
fall back to the on-heap cache otherwise. So you could test that theory by
enabling JNA but explicitly setting the row cache provider to
ConcurrentLinkedHashCacheProvider on all your ColumnFamilies.
Another possibility is where we call posix_fadvise in CLibrary.trySkipCache.
Try commenting out the method body there to make it a no-op, and see if you can
reproduce with that + the rest of JNA enabled. (If that fixes the problem,
then it's probably a kernel bug.)
> SStable data corruption in 1.0.x
> --------------------------------
>
> Key: CASSANDRA-3468
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3468
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.0
> Environment: RHEL 6 running Cassandra 1.0.x.
> Reporter: Terry Cumaranatunge
> Labels: patch
>
> We have noticed several instances of sstable corruptions in 1.0.x. This has
> occurred in 1.0.0-rcx and 1.0.0 and 1.0.1. It has happened on multiple nodes
> and multiple hosts with different disks, so this is the reason the software
> is suspected at this time. The file system used is XFS, but no resets or any
> type of failure scenarios have been run to create the problem. We were
> basically running under load and every so often, we see that the sstable gets
> corrupted and compaction stops on that node.
> I will attach the relevant sstable files if it lets me do that when I create
> this ticket.
> ERROR [CompactionExecutor:23] 2011-10-27 11:14:09,309 PrecompactedRow.java
> (line 119) Skipping row DecoratedKey(128013852116656632841539411062933532114,
> 37303730303138313533) in
> /var/lib/cassandra/data/MSA/participants-h-8688-Data.db
> java.io.EOFException
> at java.io.RandomAccessFile.readFully(RandomAccessFile.java:399)
> at java.io.RandomAccessFile.readFully(RandomAccessFile.java:377)
> at
> org.apache.cassandra.utils.BytesReadTracker.readFully(BytesReadTracker.java:95)
> at
> org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:388)
> at
> org.apache.cassandra.utils.ByteBufferUtil.readWithLength(ByteBufferUtil.java:350)
> at
> org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:96)
> at
> org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:36)
> at
> org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:143)
> at
> org.apache.cassandra.io.sstable.SSTableIdentityIterator.getColumnFamilyWithColumns(SSTableIdentityIterator.java:231)
> at
> org.apache.cassandra.db.compaction.PrecompactedRow.merge(PrecompactedRow.java:115)
> at
> org.apache.cassandra.db.compaction.PrecompactedRow.<init>(PrecompactedRow.java:102)
> at
> org.apache.cassandra.db.compaction.CompactionController.getCompactedRow(CompactionController.java:127)
> at
> org.apache.cassandra.db.compaction.CompactionIterable$Reducer.getReduced(CompactionIterable.java:102)
> at
> org.apache.cassandra.db.compaction.CompactionIterable$Reducer.getReduced(CompactionIterable.java:87)
> at
> org.apache.cassandra.utils.MergeIterator$ManyToOne.consume(MergeIterator.java:116)
> at
> org.apache.cassandra.utils.MergeIterator$ManyToOne.computeNext(MergeIterator.java:99)
> at
> com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:140)
> at
> com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:135)
> at
> com.google.common.collect.Iterators$7.computeNext(Iterators.java:614)
> at
> com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:140)
> at
> com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:135)
> at
> org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:179)
> at
> org.apache.cassandra.db.compaction.LeveledCompactionTask.execute(LeveledCompactionTask.java:47)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:131)
> at
> org.apache.cassandra.db.compaction.CompactionManager$1.call(CompactionManager.java:114)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> This was Sylvain's analysis:
> I don't have much better news. Basically it seems the 2 last MB of the file
> are complete garbage (which also explain the mmap error btw). And given where
> the corruption actually starts, it suggests that it's either a very low level
> bug in our file writer code that start writting bad data at some point for
> some reason, or it's corruption not related to Cassandra. But given that, a
> Cassandra bug sounds fairly unlikely.
> You said that you saw that corruption more than once. Could you be more
> precise? In particular, did you get it on different hosts? Also, what file
> system are you using?
> If you do happen to have another instance of a corrupted sstable (ideally
> from some other host) that you can share, please don't hesitate. I could try
> to look if I find something common between the two.
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