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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: 0.7.4 Bad sstables?
Date Mon, 25 Apr 2011 17:08:10 GMT
Was it on a "large" row?  (> in_memory_compaction_limit?)

I'm starting to suspect that LazilyCompactedRow is computing row size
incorrectly in some cases.

On Mon, Apr 25, 2011 at 11:47 AM, Terje Marthinussen
<tmarthinussen@gmail.com> wrote:
> I have been hunting similar looking corruptions, especially in the hints
> column family, but I believe it occurs somewhere while  compacting.
> I looked in greater detail on one sstable and the row length was longer than
> the actual data in the row, and as far as I could see, either the length was
> wrong or the row was missing data as there was was no extra data in the row
> after the last column.
> This was however on a somewhat aging dataset, so suspected it could be
> related to 2376.
>
> Playing around with 0.8 at the moment and not seen it there yet.... (bet it
> will show up tomorrow once I wrote that.. :))
> Terje
>
> On Tue, Apr 26, 2011 at 12:44 AM, Sanjeev Kulkarni <sanjeev@locomatix.com>
> wrote:
>>
>> Hi Sylvain,
>> I started it from 0.7.4 with the patch 2376. No upgrade.
>> Thanks!
>>
>> On Mon, Apr 25, 2011 at 7:48 AM, Sylvain Lebresne <sylvain@datastax.com>
>> wrote:
>>>
>>> Hi Sanjeev,
>>>
>>> What's the story of the cluster ? Did you started with 0.7.4, or is it
>>> upgraded from
>>> some earlier version ?
>>>
>>> On Mon, Apr 25, 2011 at 5:54 AM, Sanjeev Kulkarni <sanjeev@locomatix.com>
>>> wrote:
>>> > Hey guys,
>>> > Running a one node cassandra server with version 0.7.4 patched
>>> > with https://issues.apache.org/jira/browse/CASSANDRA-2376
>>> > The system was running fine for a couple of days when we started
>>> > noticing
>>> > something strange with cassandra. I stopped all applications and
>>> > restarted
>>> > cassandra. And then did a scrub. During scrub, I noticed these in the
>>> > logs
>>> > WARN [CompactionExecutor:1] 2011-04-24 23:37:07,561
>>> > CompactionManager.java
>>> > (line 607) Non-fatal error reading row (stacktrace follows)
>>> > java.io.IOError: java.io.IOException: Impossible row size
>>> > 1516029079813320210
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.doScrub(CompactionManager.java:589)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.access$600(CompactionManager.java:56)
>>> >        at
>>> >
>>> > org.apache.cassandra.db.CompactionManager$3.call(CompactionManager.java:195)
>>> >         at
>>> > java.util.concurrent.FutureTask$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)
>>> >        at java.lang.Thread.run(Thread.java:662)
>>> > Caused by: java.io.IOException: Impossible row size 1516029079813320210
>>> >    ... 8 more
>>> >  INFO [CompactionExecutor:1] 2011-04-24 23:37:07,640
>>> > CompactionManager.java
>>> > (line 613) Retrying from row index; data is -1768177699 bytes starting
>>> > at
>>> > 2626524914
>>> >  WARN [CompactionExecutor:1] 2011-04-24 23:37:07,641
>>> > CompactionManager.java
>>> > (line 633) Retry failed too.  Skipping to next row (retry's stacktrace
>>> > follows)
>>> > java.io.IOError: java.io.EOFException: bloom filter claims to be
>>> > 1868982636
>>> > bytes, longer than entire row size -1768177699        at
>>> >
>>> > org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:117)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.doScrub(CompactionManager.java:618)
>>> >        at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.access$600(CompactionManager.java:56)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager$3.call(CompactionManager.java:195)
>>> >        at
>>> > java.util.concurrent.FutureTask$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)
>>> >        at java.lang.Thread.run(Thread.java:662)
>>> > Caused by: java.io.EOFException: bloom filter claims to be 1868982636
>>> > bytes,
>>> > longer than entire row size -1768177699        at
>>> >
>>> > org.apache.cassandra.io.sstable.IndexHelper.defreezeBloomFilter(IndexHelper.java:116)
>>> >         at
>>> >
>>> > org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:87)
>>> >        ... 8 more
>>> > WARN [CompactionExecutor:1] 2011-04-24 23:37:16,545
>>> > CompactionManager.java
>>> > (line 607) Non-fatal error reading row (stacktrace follows)
>>> > java.io.IOError: java.io.EOFException
>>> >         at
>>> >
>>> > org.apache.cassandra.io.sstable.SSTableIdentityIterator.next(SSTableIdentityIterator.java:144)
>>> >         at
>>> >
>>> > org.apache.cassandra.io.sstable.SSTableIdentityIterator.next(SSTableIdentityIterator.java:40)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.set(CollatingIterator.java:284)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.least(CollatingIterator.java:326)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.next(CollatingIterator.java:230)
>>> >         at
>>> >
>>> > org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:68)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
>>> >         at
>>> > com.google.common.collect.Iterators$7.computeNext(Iterators.java:604)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnIndexer.serializeInternal(ColumnIndexer.java:76)
>>> >         at
>>> > org.apache.cassandra.db.ColumnIndexer.serialize(ColumnIndexer.java:50)
>>> >         at
>>> >
>>> > org.apache.cassandra.io.LazilyCompactedRow.<init>(LazilyCompactedRow.java:90)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.getCompactedRow(CompactionManager.java:778)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.doScrub(CompactionManager.java:591)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager.access$600(CompactionManager.java:56)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.CompactionManager$3.call(CompactionManager.java:195)
>>> >         at
>>> > java.util.concurrent.FutureTask$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)
>>> >         at java.lang.Thread.run(Thread.java:662)
>>> > Caused by: java.io.EOFException
>>> >         at
>>> > java.io.RandomAccessFile.readFully(RandomAccessFile.java:383)
>>> >         at
>>> > java.io.RandomAccessFile.readFully(RandomAccessFile.java:361)
>>> >         at
>>> >
>>> > org.apache.cassandra.io.util.BufferedRandomAccessFile.readBytes(BufferedRandomAccessFile.java:270)
>>> >         at
>>> > org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:317)
>>> >         at
>>> >
>>> > org.apache.cassandra.utils.ByteBufferUtil.readWithLength(ByteBufferUtil.java:273)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:94)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:35)
>>> >         at
>>> >
>>> > org.apache.cassandra.io.sstable.SSTableIdentityIterator.next(SSTableIdentityIterator.java:140)
>>> >         ... 22 more
>>> >  INFO [CompactionExecutor:1] 2011-04-24 23:37:16,561
>>> > CompactionManager.java
>>> > (line 613) Retrying from row index; data is 78540539 bytes starting at
>>> > 2229643127
>>> >
>>> > And then when i restarted the readers, i get the following crash
>>> > ERROR [ReadStage:24] 2011-04-24 23:43:05,658
>>> > AbstractCassandraDaemon.java
>>> > (line 112) Fatal exception in thread Thread[ReadStage:24,5,main]
>>> > java.lang.AssertionError: mmap segment underflow; remaining is
>>> > 791462117 but
>>> > 1970433058 requested
>>> >         at
>>> >
>>> > org.apache.cassandra.io.util.MappedFileDataInput.readBytes(MappedFileDataInput.java:119)
>>> >         at
>>> > org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:317)
>>> >         at
>>> >
>>> > org.apache.cassandra.utils.ByteBufferUtil.readWithLength(ByteBufferUtil.java:273)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:94)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:35)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.columniterator.IndexedSliceReader$IndexedBlockFetcher.getNextBlock(IndexedSliceReader.java:181)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.columniterator.IndexedSliceReader.computeNext(IndexedSliceReader.java:121)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.columniterator.IndexedSliceReader.computeNext(IndexedSliceReader.java:49)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.columniterator.SSTableSliceIterator.hasNext(SSTableSliceIterator.java:108)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.set(CollatingIterator.java:283)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.least(CollatingIterator.java:326)
>>> >         at
>>> >
>>> > org.apache.commons.collections.iterators.CollatingIterator.next(CollatingIterator.java:230)
>>> >         at
>>> >
>>> > org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:68)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
>>> >         at
>>> >
>>> > com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns(SliceQueryFilter.java:116)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.filter.QueryFilter.collectCollatedColumns(QueryFilter.java:130)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1368)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1245)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1173)
>>> >         at org.apache.cassandra.db.Table.getRow(Table.java:333)
>>> >         at
>>> >
>>> > org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:63)
>>> >         at
>>> >
>>> > org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:453)
>>> >         at
>>> > org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
>>> >         at
>>> >
>>> > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>> >         at
>>> >
>>> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>> >         at java.lang.Thread.run(Thread.java:662)
>>> >
>>> > Any ideas?
>>> > Thanks!
>>
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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