[CASSANDRA-7465] DecoratedKey assertion error on reads

• Type: Bug
• Status: Resolved
• Priority: Urgent
• Resolution: Fixed
• Fix Version/s: 2.1 rc3

Environment

3 nodes
Oracle Linux Server 6.3
kernel ver 2.6.39

• Severity: Critical
• Since Version: 2.1 rc2
• Assignee: T Jake Luciani
• Reporter: Jason Brown

Authors

T Jake Luciani

Reviewers

Jason Brown

• Created: 27/Jun/14 21:34
• Updated: 16/Apr/19 09:31
• Resolved: 01/Jul/14 17:39

Description

Getting the following exception when running read stress:

WARN  [SharedPool-Worker-31] 2014-06-27 21:25:51,391 AbstractTracingAwareExecutorService.java:166 - Uncaught exception on thread Thread[SharedPool-Worker-31,10,main]: {}
java.lang.AssertionError: DecoratedKey(-5397116645141815707, 30303031393143364639) != DecoratedKey(-5397116645141815707, 30303031343439443233) in /u/sdd/cassandra-jasobrown/data/Keyspace1/Standard1-6ab9bd90fe3b11e385edff96c2ef2fd6/Keyspace1-Standard1-ka-73-Data.db
	at org.apache.cassandra.db.columniterator.SSTableNamesIterator.read(SSTableNamesIterator.java:111) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.columniterator.SSTableNamesIterator.<init>(SSTableNamesIterator.java:59) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.filter.NamesQueryFilter.getSSTableColumnIterator(NamesQueryFilter.java:89) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:62) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.CollationController.collectTimeOrderedData(CollationController.java:125) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:59) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1873) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1681) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.Keyspace.getRow(Keyspace.java:341) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.db.SliceByNamesReadCommand.getRow(SliceByNamesReadCommand.java:55) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:1393) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2060) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_13]
	at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:162) ~[apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:103) [apache-cassandra-2.1.0-rc2-SNAPSHOT.jar:2.1.0-rc2-SNAPSHOT]
	at java.lang.Thread.run(Thread.java:722) [na:1.7.0_13]

I have a three node cluster, which I populate with the following stress command:

cassandra-stress write n=60000000 -schema replication\(factor\=2\) -key populate=1..60000000 -rate threads=42  -mode native prepared cql3 -port native=9043 thrift=9161  -node athena06-a,athena06-b,athena06-c -col n=fixed\(21\) size=exp\(11..42\)

Then I run the read stress:

cassandra-stress read n=100000000  -key dist=extr\(1..600000000,2\)  -mode native prepared cql3 -port native=9043 thrift=9161  -node athena06-b,athena06-c,athena06-a -col n=fixed\(21\) -rate threads=64

The above exception occurs semi-frequently (several to ~50 times a minute, but seems to depend on amount of data in cluster - anecdotal evidence only).