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https://issues.apache.org/jira/browse/CASSANDRA-11606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15250084#comment-15250084
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Sylvain Lebresne commented on CASSANDRA-11606:
----------------------------------------------

I'm afraid the stack trace is a bit low on info to understand why this happen 
here. I don't imagine you have an easy way to reproduce? If not, what could 
help narrowing it down is to know on which table this happen and what is the 
schema of this table.

> Upgrade from 2.1.9 to 3.0.5 Fails with AssertionError
> -----------------------------------------------------
>
>                 Key: CASSANDRA-11606
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11606
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Fedora 20, Oracle Java 8, Apache Cassandra 2.1.9 -> 3.0.5
>            Reporter: Anthony Verslues
>             Fix For: 3.0.x
>
>
> I get this error while upgrading sstables. I got the same error when 
> upgrading to 3.0.2 and 3.0.4.
> error: null
> -- StackTrace --
> java.lang.AssertionError
>         at 
> org.apache.cassandra.db.LegacyLayout$CellGrouper.addCell(LegacyLayout.java:1167)
>         at 
> org.apache.cassandra.db.LegacyLayout$CellGrouper.addAtom(LegacyLayout.java:1142)
>         at 
> org.apache.cassandra.db.UnfilteredDeserializer$OldFormatDeserializer$UnfilteredIterator.readRow(UnfilteredDeserializer.java:444)
>         at 
> org.apache.cassandra.db.UnfilteredDeserializer$OldFormatDeserializer$UnfilteredIterator.hasNext(UnfilteredDeserializer.java:423)
>         at 
> org.apache.cassandra.db.UnfilteredDeserializer$OldFormatDeserializer.hasNext(UnfilteredDeserializer.java:289)
>         at 
> org.apache.cassandra.io.sstable.SSTableSimpleIterator$OldFormatIterator.readStaticRow(SSTableSimpleIterator.java:133)
>         at 
> org.apache.cassandra.io.sstable.SSTableIdentityIterator.<init>(SSTableIdentityIterator.java:57)
>         at 
> org.apache.cassandra.io.sstable.format.big.BigTableScanner$KeyScanningIterator$1.initializeIterator(BigTableScanner.java:334)
>         at 
> org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator.maybeInit(LazilyInitializedUnfilteredRowIterator.java:48)
>         at 
> org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator.isReverseOrder(LazilyInitializedUnfilteredRowIterator.java:65)
>         at 
> org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$1.reduce(UnfilteredPartitionIterators.java:109)
>         at 
> org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$1.reduce(UnfilteredPartitionIterators.java:100)
>         at 
> org.apache.cassandra.utils.MergeIterator$OneToOne.computeNext(MergeIterator.java:442)
>         at 
> org.apache.cassandra.utils.AbstractIterator.hasNext(AbstractIterator.java:47)
>         at 
> org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$2.hasNext(UnfilteredPartitionIterators.java:150)
>         at 
> org.apache.cassandra.db.transform.BasePartitions.hasNext(BasePartitions.java:72)
>         at 
> org.apache.cassandra.db.compaction.CompactionIterator.hasNext(CompactionIterator.java:226)
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:177)
>         at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:78)
>         at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)
>         at 
> org.apache.cassandra.db.compaction.CompactionManager$5.execute(CompactionManager.java:416)
>         at 
> org.apache.cassandra.db.compaction.CompactionManager$2.call(CompactionManager.java:313)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)



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