ERROR [ReadRepairStage:63497] 2015-06-15 16:23:58,989  CassandraDaemon.java:223 - Exception in thread Thread[ReadRepairStage:63497,5,main]
java.lang.UnsupportedOperationException: This operation is unsupported on CounterUpdateCell.
        at org.apache.cassandra.db.BufferCounterUpdateCell.diff(BufferCounterUpdateCell.java:57) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.db.ColumnFamily.diff(ColumnFamily.java:308) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.db.ColumnFamily.diff(ColumnFamily.java:399) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.service.RowDataResolver.scheduleRepairs(RowDataResolver.java:115) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.service.RowDataResolver.resolve(RowDataResolver.java:92) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.service.AsyncRepairCallback$1.runMayThrow(AsyncRepairCallback.java:51) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[cassandra-all-2.1.5.469.jar:2.1.5.469]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_80]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_80]