Hi!

We’re running Cassandra 3.9

On the application side I see failed reads with this exception 
com.datastax.driver.core.exceptions.ReadFailureException: Cassandra failure 
during read query at consistency QUORUM (2 responses were required but only 0 
replica responded, 2 failed)

On the server side we see:

WARN  [SharedPool-Worker-3] 2016-10-28 13:28:22,965 
AbstractLocalAwareExecutorService.java:169 - Uncaught exception on thread 
Thread[SharedPool-Worker-3,5,
main]: {}
java.lang.AssertionError: null
        at org.apache.cassandra.db.rows.BTreeRow.getCell(BTreeRow.java:212) 
~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.canRemoveRow(SinglePartitionReadCommand.java:899)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.reduceFilter(SinglePartitionReadCommand.java:863)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndSSTablesInTimestampOrder(SinglePartitionReadCommand.java:748)
 ~[apache-cassan
dra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDiskInternal(SinglePartitionReadCommand.java:519)
 ~[apache-cassandra-3.7.jar:
3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDisk(SinglePartitionReadCommand.java:496)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryStorage(SinglePartitionReadCommand.java:358)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:366) 
~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:48)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64) 
~[apache-cassandra-3.7.jar:3.7]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[na:1.8.0_102]
        at 
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
 ~[apache-cassandra-
3.7.jar:3.7]
        at 
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)
 [apache
-cassandra-3.7.jar:3.7]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) 
[apache-cassandra-3.7.jar:3.7]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_102]

It’s only affect single table. Sadly both on test (3.9) and production (3.7) 
deployments of cassandra.

What could be the problem? Please help.

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