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From Shotaro Kamio <kamios...@gmail.com>
Subject How to repair HintsColumnFamily?
Date Sun, 27 Mar 2011 05:17:25 GMT
Hi,

Our cluster uses cassandra 0.7.4 (upgraded from 0.7.3) with
replication = 3. I found that error occurs on one node during hinted
handoff with following error (log #1 below).
When I tried out "scrub system HintsColumnFamily", I saw an ERROR in
log (log #2 below).
Do you think these errors are critical ?
I tried to "repair system HintsColumnFamily". But, it refuses to run
with "No neighbors". I can understand because hints are not
replicated. But then, is there any way to fix it without data loss?

 INFO [manual-repair-0996a2ec-26d3-4243-9586-d56daf30f9bd] 2011-03-27
13:55:05,664 AntiEntropyService.java (line 752) No neighbors to repair
with: manual-repair-0996a2ec-26d3-4243-9586-d56daf30f9bd completed.


Best regards,
Shotaro


---------------- Log #1: Error on hinted handoff
------------------------------------------------

ERROR [HintedHandoff:1] 2011-03-26 20:04:22,528
DebuggableThreadPoolExecutor.java (line 103) Error in
ThreadPoolExecutor
java.lang.RuntimeException: java.lang.RuntimeException: error reading
4976040 of 4976067
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
        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.lang.RuntimeException: error reading 4976040 of 4976067
        at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:83)
        at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:40)
        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.anyHasNext(CollatingIterator.java:364)
        at org.apache.commons.collections.iterators.CollatingIterator.hasNext(CollatingIterator.java:217)
        at org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:63)
        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.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:321)
        at org.apache.cassandra.db.HintedHandOffManager.access$100(HintedHandOffManager.java:88)
        at org.apache.cassandra.db.HintedHandOffManager$2.runMayThrow(HintedHandOffManager.java:409)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        ... 3 more
Caused by: java.io.EOFException
        at java.io.RandomAccessFile.readByte(RandomAccessFile.java:591)
        at org.apache.cassandra.utils.ByteBufferUtil.readShortLength(ByteBufferUtil.java:324)
        at org.apache.cassandra.utils.ByteBufferUtil.readWithShortLength(ByteBufferUtil.java:335)
        at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:351)
        at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:311)
        at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:79)
        ... 21 more

------------------------------------------

---- Log #2: Error on scrub -------------------

 INFO [CompactionExecutor:1] 2011-03-27 08:07:34,527
CompactionManager.java (line 512) Scrubbing
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-530-Data.db')
 WARN [CompactionExecutor:1] 2011-03-27 08:07:34,602
CompactionManager.java (line 607) Non-fatal error reading row
(stacktrace follows)
java.io.IOError: java.io.IOException: Impossible row size 406136901
        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 406136901
        ... 8 more
 INFO [CompactionExecutor:1] 2011-03-27 08:07:34,602
CompactionManager.java (line 613) Retrying from row index; data is
406134739 bytes starting at 21
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,065
CompactionManager.java (line 653) Scrub of
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-530-Data.db')
complete: 1 rows in new sstable and 0 empty (tombstoned) rows dropped
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,065
CompactionManager.java (line 512) Scrubbing
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-531-Data.db')
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,145
CompactionManager.java (line 653) Scrub of
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-531-Data.db')
complete: 1 rows in new sstable and 0 empty (tombstoned) rows dropped
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,145
CompactionManager.java (line 512) Scrubbing
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-532-Data.db')
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,363
CompactionManager.java (line 653) Scrub of
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-532-Data.db')
complete: 1 rows in new sstable and 0 empty (tombstoned) rows dropped
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,364
CompactionManager.java (line 512) Scrubbing
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-533-Data.db')
 INFO [CompactionExecutor:1] 2011-03-27 08:08:10,540
CompactionManager.java (line 653) Scrub of
SSTableReader(path='/data/cassandra/system/HintsColumnFamily-f-533-Data.db')
complete: 1 rows in new sstable and 0 empty (tombstoned) rows dropped
--------------------------------------------------------

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