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https://issues.apache.org/jira/browse/CASSANDRA-16764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17370928#comment-17370928
 ] 

Richard Hesse commented on CASSANDRA-16764:
-------------------------------------------

Looking at the heap dump, there's definitely some application level garbage 
that made its way in there. Yep, it's a 2GB column value. 

> Compaction repeatedly fails validateReallocation exception
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-16764
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16764
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Compaction/LCS
>            Reporter: Richard Hesse
>            Priority: Normal
>
> I have a few nodes in my ring that are stuck repeatedly trying to compact the 
> same tables over and over again. I've run through the usual trick of rolling 
> restarts, and it doesn't seem to help. This exception is logged on the nodes:
> {code}
> ERROR [CompactionExecutor:6] 2021-06-25 20:28:30,001 CassandraDaemon.java:244 
> - Exception in thread Thread[CompactionExecutor:6,1,main]
> java.lang.RuntimeException: null
>         at 
> org.apache.cassandra.io.util.DataOutputBuffer.validateReallocation(DataOutputBuffer.java:134)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.util.DataOutputBuffer.calculateNewSize(DataOutputBuffer.java:152)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.util.DataOutputBuffer.expandToFit(DataOutputBuffer.java:159)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.util.DataOutputBuffer.doFlush(DataOutputBuffer.java:119)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.util.BufferedDataOutputStreamPlus.write(BufferedDataOutputStreamPlus.java:132)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.util.BufferedDataOutputStreamPlus.write(BufferedDataOutputStreamPlus.java:151)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.utils.ByteBufferUtil.writeWithVIntLength(ByteBufferUtil.java:296)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.marshal.AbstractType.writeValue(AbstractType.java:426)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.ClusteringPrefix$Serializer.serializeValuesWithoutSize(ClusteringPrefix.java:323)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.Clustering$Serializer.serialize(Clustering.java:131) 
> ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.ClusteringPrefix$Serializer.serialize(ClusteringPrefix.java:266)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.Serializers$NewFormatSerializer.serialize(Serializers.java:167)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.Serializers$NewFormatSerializer.serialize(Serializers.java:154)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.sstable.IndexInfo$Serializer.serialize(IndexInfo.java:103)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.sstable.IndexInfo$Serializer.serialize(IndexInfo.java:82)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.ColumnIndex.addIndexBlock(ColumnIndex.java:216) 
> ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at org.apache.cassandra.db.ColumnIndex.add(ColumnIndex.java:264) 
> ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.ColumnIndex.buildRowIndex(ColumnIndex.java:111) 
> ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.sstable.format.big.BigTableWriter.append(BigTableWriter.java:173)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:136)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.writers.MaxSSTableSizeWriter.realAppend(MaxSSTableSizeWriter.java:98)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.append(CompactionAwareWriter.java:143)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:204)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
> ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:85)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:272)
>  ~[apache-cassandra-3.11.10.jar:3.11.10]
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> ~[na:1.8.0_292]
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
> ~[na:1.8.0_292]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  ~[na:1.8.0_292]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_292]
>         at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84)
>  [apache-cassandra-3.11.10.jar:3.11.10]
>         at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_292]
> {code}
> Watching the compaction progress, it looks like it makes it through, dies, 
> then starts over again. This process repeats forever.



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