i am seeing several different exceptions across my 8 node cluster. running 0.7 RC2. the following are all from one node. is this a known issue?

ERROR [MutationStage:35] 2010-12-15 09:25:06,466 RowMutationVerbHandler.java (line 83) Error in row mutation org.apache.cassandra.db.UnserializableColumnFamilyException: Couldn't find cfId=-1487798272 at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:117) at org.apache.cassandra.db.RowMutationSerializer.defreezeTheMaps(RowMutation.java:383) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:393) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:351) at org.apache.cassandra.db.RowMutationVerbHandler.doVerb(RowMutationVerbHandler.java:52) at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:63) 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:619)

ERROR [MutationStage:19] 2010-12-15 09:29:43,605 RowMutationVerbHandler.java (line 83) Error in row mutation
java.io.EOFException
        at java.io.DataInputStream.readFully(DataInputStream.java:180)
at org.apache.cassandra.utils.FBUtilities.readByteArray(FBUtilities.java:264) at org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:95) at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:363) at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:312) at org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:129) at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:120) at org.apache.cassandra.db.RowMutationSerializer.defreezeTheMaps(RowMutation.java:383) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:393) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:351) at org.apache.cassandra.db.RowMutationVerbHandler.doVerb(RowMutationVerbHandler.java:52) at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:63) 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:619)


ERROR [MutationStage:8] 2010-12-15 10:09:42,953 RowMutationVerbHandler.java (line 83) Error in row mutation org.apache.cassandra.db.ColumnSerializer$CorruptColumnException: invalid column name length 0 at org.apache.cassandra.db.ColumnSerializer.deserialize(ColumnSerializer.java:68) at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:363) at org.apache.cassandra.db.SuperColumnSerializer.deserialize(SuperColumn.java:312) at org.apache.cassandra.db.ColumnFamilySerializer.deserializeColumns(ColumnFamilySerializer.java:129) at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:120) at org.apache.cassandra.db.RowMutationSerializer.defreezeTheMaps(RowMutation.java:383) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:393) at org.apache.cassandra.db.RowMutationSerializer.deserialize(RowMutation.java:351) at org.apache.cassandra.db.RowMutationVerbHandler.doVerb(RowMutationVerbHandler.java:52) at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:63) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)


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