estimateRowsFromIndex exception in 0.7.5

[Wenjun Che]

Hello,

I have a one node cluster (refresh install from 0.7.4 and upgraded to 0.7.5
last week).  The data is being backed up by  a cron job that periodically
tar/gzip entire
var/lib directory.  when I tested the backup by restoring the last tar file,
I am seeing the following exception:

DEBUG 13:45:37,830 Load statistics for
\var\lib\cassandra\data\Appoji\ApplicationUserPermission-f-6
ERROR 13:45:37,832 Exception encountered during startup.
java.lang.AssertionError
        at
org.apache.cassandra.io.sstable.SSTable.estimateRowsFromIndex(SSTable.java:233)
        at
org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:286)
        at
org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:191)
        at
org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:232)
        at
org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:
480)
        at
org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:
461)
        at org.apache.cassandra.db.Table.initCf(Table.java:308)
        at org.apache.cassandra.db.Table.<init>(Table.java:245)
        at org.apache.cassandra.db.Table.open(Table.java:106)
        at
org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:1
61)
        at
org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.jav
a:315)
        at
org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:79)
Exception encountered during startup.

I checked few other earlier backup tar files and they seem to be fine.  Can
this be caused by the way I am backing  it up?


Thanks