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From "Kurt Greaves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12867) Batch with multiple conditional updates for the same partition causes AssertionError
Date Mon, 31 Oct 2016 23:11:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623735#comment-15623735
] 

Kurt Greaves commented on CASSANDRA-12867:
------------------------------------------

[~mshuler] this was discovered from a test added by [~alwyn] in CASSANDRA-12649. Once we get
some confirmation on the "correctness" I'm happy to write a test for this. The test in 12649
would cover this but it's probably not in the most appropriate location.

> 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: Kurt Greaves
>         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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