Walllee li created CASSANDRA-12771:

             Summary: the method scheduleFlush in CloumnFamilyStore maybe 
damage the sstable_activity data file
                 Key: CASSANDRA-12771
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12771
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: OS:suse11 SP3
JDK:Java HotSpot(TM) 64-Bit Server VM build 1.7.0_55-b13
            Reporter: Walllee li

Cassandra during running,it will automatically generate a group sstable files 
for cf sstable_activity intervals an hour.but if you running a tool like 
sstableupgrade , the tools may start a schedule task to flush sstable_activity.
In two different JVM, the sstable's index is the same.the group sstable files 
can be damage.

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