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https://issues.apache.org/jira/browse/CASSANDRA-5925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jeremy Hanna updated CASSANDRA-5925:
------------------------------------
Labels: LWT (was: )
> Race condition in update lightweight transaction
> ------------------------------------------------
>
> Key: CASSANDRA-5925
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5925
> Project: Cassandra
> Issue Type: Bug
> Environment: 3 node Cassandra 2.0.0-rc2 cluster. Java driver 1.0.2.
> Reporter: Phil Persad
> Assignee: Sylvain Lebresne
> Priority: Major
> Labels: LWT
> Fix For: 2.0.0
>
> Attachments: 5925.txt, TokenConsumptionTest.java
>
>
> I'm building some tests for a Cassandra PoC. One scenario I need to test is
> consumption of 1 time tokens. These tokens must be consumed exactly once.
> The cluster involved is a 3 node cluster. All queries are run with
> ConsistencyLevel.QUORUM. I'm using the following queries:
> CREATE KEYSPACE IF NOT EXISTS test WITH replication = { 'class' :
> 'SimpleStrategy', 'replication_factor' : 3 };
> CREATE TABLE IF NOT EXISTS tkns (tkn blob, consumed boolean, PRIMARY KEY
> (tkn));
> INSERT INTO tkns (tkn, consumed) VALUES (?,FALSE) USING TTL 30;
> UPDATE tkns USING TTL 1 SET consumed = TRUE WHERE tkn = ? IF consumed = FALSE;
> I use the '[applied]' column in the result set of the update statement to
> determine whether the token has been successfully consumed or if the token is
> being replayed.
> My test involves concurrently executing many sets of 1 insert and 2 update
> statements (using Session#execute on BoundStatemnts) then checking to make
> sure that only one of the updates was applied.
> When I run this test with relatively few iterations (~100) my results are
> what I expect (exactly 1 update succeeds). At ~1000 iterations, I start
> seeing both updates reporting success in 1-2% of cases. While my test is
> running, I see corresponding error entries in the Cassandra log:
> ERROR 15:34:53,583 Exception in thread Thread[MutationStage:522,5,main]
> java.lang.NullPointerException
> ERROR 15:34:53,584 Exception in thread Thread[MutationStage:474,5,main]
> java.lang.NullPointerException
> ERROR 15:34:53,584 Exception in thread Thread[MutationStage:536,5,main]
> java.lang.NullPointerException
> ERROR 15:34:53,729 Exception in thread Thread[MutationStage:480,5,main]
> java.lang.NullPointerException
> ERROR 15:34:53,729 Exception in thread Thread[MutationStage:534,5,main]
> java.lang.NullPointerException
> Thanks.
> Update:
> I'm not sure what's going on with the logging the the dev release. I grabbed
> the rc2 source and built that. The resultant log is a bit more informative:
> ERROR 11:53:38,967 Exception in thread Thread[MutationStage:114,5,main]
> java.lang.NullPointerException
> at
> org.apache.cassandra.serializers.UUIDSerializer.deserialize(UUIDSerializer.java:32)
> at
> org.apache.cassandra.serializers.UUIDSerializer.deserialize(UUIDSerializer.java:26)
> at
> org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:142)
> at
> org.apache.cassandra.cql3.UntypedResultSet$Row.getUUID(UntypedResultSet.java:131)
> at
> org.apache.cassandra.db.SystemKeyspace.loadPaxosState(SystemKeyspace.java:785)
> at
> org.apache.cassandra.service.paxos.PaxosState.commit(PaxosState.java:118)
> at
> org.apache.cassandra.service.paxos.CommitVerbHandler.doVerb(CommitVerbHandler.java:34)
> at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:56)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:722)
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