These types of exceptions is seen sporadically in our cassandra logs.  They 
occur especially after running a repair with the nodetool. 

I assume there are a few "corrupt" rows.   Is this cause for panic?

 Will a repair fix this, or is it best to do a "decomission + bootstrap" via a 
move for example?   or would a "scrub" help here?


ERROR [CompactionExecutor:1] 2011-04-07 15:51:12,093 PrecompactedRow.java (line 
82) Skipping row DecoratedKey(36813508603227779893025154359070714012, 
32326437643439642d623566332d346433392d613334622d343738643433633130383633) in 
/var/lib/cassandra/data/DFS/main-f-164-Data.db
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:268)
        at 
org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:310)
        at 
org.apache.cassandra.utils.ByteBufferUtil.readWithLength(ByteBufferUtil.java:267)
        at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:76)
        at 
org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:35)
        at 
org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:129)
        at 
org.apache.cassandra.io.sstable.SSTableIdentityIterator.getColumnFamilyWithColumns(SSTableIdentityIterator.java:176)
        at 
org.apache.cassandra.io.PrecompactedRow.<init>(PrecompactedRow.java:78)
        at 
org.apache.cassandra.io.CompactionIterator.getCompactedRow(CompactionIterator.java:139)
        at 
org.apache.cassandra.io.CompactionIterator.getReduced(CompactionIterator.java:108)
        at 
org.apache.cassandra.io.CompactionIterator.getReduced(CompactionIterator.java:43)
        at 
org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:73)
        at 
com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
        at 
com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
        at 
org.apache.commons.collections.iterators.FilterIterator.setNextObject(FilterIterator.java:183)
        at 
org.apache.commons.collections.iterators.FilterIterator.hasNext(FilterIterator.java:94)
        at 
org.apache.cassandra.db.CompactionManager.doValidationCompaction(CompactionManager.java:803)
        at 
org.apache.cassandra.db.CompactionManager.access$800(CompactionManager.java:56)
        at 
org.apache.cassandra.db.CompactionManager$6.call(CompactionManager.java:358)
        at java.util.concurrent.FutureTask$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)
ERROR [CompactionExecutor:1] 2011-04-07 15:51:26,356




 INFO [MigrationStage:1] 2011-03-11 17:20:10,900 Migration.java (line 136) 
Applying migration 6f6e2a6c-4bfb-11e0-a3ae-87e4c47e8541 Add keyspace: DFSrep 
factor:2rep 
strategy:NetworkTopologyStrategy{org.apache.cassandra.config.CFMetaData@2a4bd173[cfId=1000,tableName=DFS,cfName=main,cfType=Standard,comparator=org.apache.cassandra.db.marshal.BytesType@c16c2c0,subcolumncomparator=<null>,c...skipping...
        at 
org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:129)
        at 
org.apache.cassandra.io.sstable.SSTableIdentityIterator.getColumnFamilyWithColumns(SSTableIdentityIterator.java:176)
        at 
org.apache.cassandra.io.PrecompactedRow.<init>(PrecompactedRow.java:78)
        at 
org.apache.cassandra.io.CompactionIterator.getCompactedRow(CompactionIterator.java:139)
        at 
org.apache.cassandra.io.CompactionIterator.getReduced(CompactionIterator.java:108)
        at 
org.apache.cassandra.io.CompactionIterator.getReduced(CompactionIterator.java:43)
        at 
org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:73)
        at 
com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
        at 
com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
        at 
org.apache.commons.collections.iterators.FilterIterator.setNextObject(FilterIterator.java:183)
        at 
org.apache.commons.collections.iterators.FilterIterator.hasNext(FilterIterator.java:94)
        at 
org.apache.cassandra.db.CompactionManager.doCompaction(CompactionManager.java:449)
        at 
org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:124)
        at 
org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:94)
        at java.util.concurrent.FutureTask$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)
ERROR [CompactionExecutor:1] 2011-04-07 16:01:26,860 
AbstractCassandraDaemon.java (line 114) Fatal exception in thread 
Thread[CompactionExecutor:1,1,main]
java.io.IOError: java.io.EOFException
        at 
org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:117)
        at 
org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:67)
        at 
org.apache.cassandra.io.sstable.SSTableScanner$KeyScanningIterator.next(SSTableScanner.java:179)
        at 
org.apache.cassandra.io.sstable.SSTableScanner$KeyScanningIterator.next(SSTableScanner.java:144)
        at 
org.apache.cassandra.io.sstable.SSTableScanner.next(SSTableScanner.java:136)
        at 
org.apache.cassandra.io.sstable.SSTableScanner.next(SSTableScanner.java:39)
        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 
org.apache.commons.collections.iterators.FilterIterator.setNextObject(FilterIterator.java:183)
        at 
org.apache.commons.collections.iterators.FilterIterator.hasNext(FilterIterator.java:94)
        at 
org.apache.cassandra.db.CompactionManager.doCompaction(CompactionManager.java:449)
        at 
org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:124)
        at 
org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:94)
        at java.util.concurrent.FutureTask$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 
org.apache.cassandra.io.sstable.IndexHelper.skipIndex(IndexHelper.java:65)
        at 
org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:109)
        ... 21 more

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