When restarting one of the nodes in my cluster I found this error in the log. What does this mean?
INFO [GC inspection] 2010-04-15 05:03:04,898 GCInspector.java (line 110) GC for ConcurrentMarkSweep: 712 ms, 11149016 reclaimed leaving 442336680 used; max is 4432068608 ERROR [HINTED-HANDOFF-POOL:1] 2010-04-15 05:03:17,948 DebuggableThreadPoolExecutor.java (line 94) Error in executor futuretask java.util.concurrent.ExecutionException: java.lang.AssertionError: DecoratedKey(163143070370570938845670096830182058073, 1K2i35+B8RuuRDP7Gwz3Xw==) != DecoratedKey(163143368384879375649994309361429628039, 4k54mGvj7JoT5rBH68K+9A==) in /outbrain/cassandra/data/outbrain/DocumentMapping-305-Data.db at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) at java.util.concurrent.FutureTask.get(FutureTask.java:83) at org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:86) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.AssertionError: DecoratedKey(163143070370570938845670096830182058073, 1K2i35+B8RuuRDP7Gwz3Xw==) != DecoratedKey(163143368384879375649994309361429628039, 4k54mGvj7JoT5rBH68K+9A==) in /outbrain/cassandra/data/outbrain/DocumentMapping-305-Data.db at org.apache.cassandra.db.filter.SSTableSliceIterator$ColumnGroupReader.<init>(SSTableSliceIterator.java:127) at org.apache.cassandra.db.filter.SSTableSliceIterator.<init>(SSTableSliceIterator.java:59) at org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(SliceQueryFilter.java:63) at org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:830) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:750) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:719) at org.apache.cassandra.db.HintedHandOffManager.sendMessage(HintedHandOffManager.java:122) at org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:250) at org.apache.cassandra.db.HintedHandOffManager.access$100(HintedHandOffManager.java:80) at org.apache.cassandra.db.HintedHandOffManager$2.runMayThrow(HintedHandOffManager.java:280) at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) 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) ... 2 more