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.