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From "Michael Shuler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12867) Batch with multiple conditional updates for the same partition causes AssertionError
Date Thu, 03 Nov 2016 17:16:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Shuler updated CASSANDRA-12867:
---------------------------------------
    Fix Version/s: 3.10
                   3.0.10

> Batch with multiple conditional updates for the same partition causes AssertionError
> ------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-12867
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12867
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>            Reporter: Kurt Greaves
>            Assignee: Sylvain Lebresne
>            Priority: Critical
>             Fix For: 3.0.10, 3.10
>
>         Attachments: 12867-3.0.patch
>
>
> Reproduced in 3.0.10 and 3.10. Used to work in 3.0.9 and earlier. Bug was introduced
in CASSANDRA-12060.
> The following causes an AssertionError:
> {code}
> CREATE KEYSPACE test WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor'
: 1 };
> create table test.test (id int PRIMARY KEY, val text);
> BEGIN BATCH INSERT INTO test.test (id, val) VALUES (999, 'aaa') IF NOT EXISTS; INSERT
INTO test.test (id, val) VALUES (999, 'ccc') IF NOT EXISTS; APPLY BATCH ;
> {code}
> Stack trace is as follows:
> {code}
> ERROR [Native-Transport-Requests-2] 2016-10-31 04:16:44,231 Message.java:622 - Unexpected
exception during request; channel = [id: 0x176e1c04, L:/127.0.0.1:9042 - R:/127.0.0.1:59743]
> java.lang.AssertionError: null
>         at org.apache.cassandra.cql3.statements.CQL3CasRequest.setConditionsForRow(CQL3CasRequest.java:138)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.CQL3CasRequest.addExistsCondition(CQL3CasRequest.java:104)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.CQL3CasRequest.addNotExist(CQL3CasRequest.java:84)
~[main/:na]
>         at org.apache.cassandra.cql3.IfNotExistsCondition.addConditionsTo(IfNotExistsCondition.java:28)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.ModificationStatement.addConditions(ModificationStatement.java:482)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.BatchStatement.makeCasRequest(BatchStatement.java:434)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.BatchStatement.executeWithConditions(BatchStatement.java:379)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.BatchStatement.execute(BatchStatement.java:358)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.BatchStatement.execute(BatchStatement.java:346)
~[main/:na]
>         at org.apache.cassandra.cql3.statements.BatchStatement.execute(BatchStatement.java:341)
~[main/:na]
>         at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:218)
~[main/:na]
>         at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:249)
~[main/:na]
>         at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:234)
~[main/:na]
>         at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:115)
~[main/:na]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:516)
[main/:na]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:409)
[main/:na]
>         at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
[netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:35)
[netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:357)
[netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_102]
>         at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
[main/:na]
>         at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) [main/:na]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_102]
> {code}
> The problem is that previous will receive a value after the first statement in the batch
is evaluated in BatchStatement.makeCasRequest. I can't see any reason why we have this assertion,
it seems to me that it's unnecessary.
> Removing it fixes the problem (obviously) but I'm not sure if it breaks something else,
or if this is an intended failure case (in which case it should be caught earlier on).
> Relevant code is as follows:
> {code:title=CQL3CasRequest.java}
>     private void setConditionsForRow(Clustering clustering, RowCondition condition)
>     {
>         if (clustering == Clustering.STATIC_CLUSTERING)
>         {
>             assert staticConditions == null;
>             staticConditions = condition;
>         }
>         else
>         {
>             RowCondition previous = conditions.put(clustering, condition);
>             assert previous == null;
>         }
>     }
> {code}
> I've attached a patch that fixes the issue by removing the assert



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