Dear All,

COuld you please help on how to resolve the below issue?

1. Only insertion of records are done since the cassandra started. But, when 
looked into the system.log messages, i see this following error.

ERROR [HintedHandoff:15] 2014-08-22 22:35:17,629 SliceQueryFilter.java (line 
200) Scanned over 200000 tombstones in system.hints; query aborted (see 
tombstone_fail_threshold)
ERROR [HintedHandoff:15] 2014-08-22 22:35:17,630 CassandraDaemon.java (line 
196) Exception in thread Thread[HintedHandoff:15,1,main]
org.apache.cassandra.db.filter.TombstoneOverwhelmingException
        at 
org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns(SliceQueryFilter.java:202)
        at 
org.apache.cassandra.db.filter.QueryFilter.collateColumns(QueryFilter.java:122)
        at 
org.apache.cassandra.db.filter.QueryFilter.collateOnDiskAtom(QueryFilter.java:80)
        at 
org.apache.cassandra.db.filter.QueryFilter.collateOnDiskAtom(QueryFilter.java:72)
        at 
org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:297)
        at 
org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:53)
        at 
org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1551)
        at 
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1380)
        at 
org.apache.cassandra.db.HintedHandOffManager.doDeliverHintsToEndpoint(HintedHandOffManager.java:374)
        at 
org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:331)
        at 
org.apache.cassandra.db.HintedHandOffManager.access$300(HintedHandOffManager.java:92)
        at 
org.apache.cassandra.db.HintedHandOffManager$5.run(HintedHandOffManager.java:558)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)
 
Now, could you please tell how the tombstone got created when there are no 
deletes executed?

2. How and where to monitor the current tombstone counts ?

3. done compaction, nodetool repair, increased the threshold count but still 
this tombstone is not getting resolved. How to resolve this issue?


Thanks
Aravindan Thangavelu

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