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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2016/01/04 15:19:39 UTC
[jira] [Commented] (CASSANDRA-10954) [Regression] Error when
removing list element with UPDATE statement
[ https://issues.apache.org/jira/browse/CASSANDRA-10954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081199#comment-15081199 ]
Sylvain Lebresne commented on CASSANDRA-10954:
----------------------------------------------
Linking to the very trivial fix along with a simple unit test to exercise it. I've started tests for the 3.0 branch but I'm dispensing from pushing a merge to trunk as the patch is beyond trivial and I'd rather save some electricity.
| [patch|https://github.com/pcmanus/cassandra/commits/10954] | [unit tests|http://cassci.datastax.com/view/Dev/view/pcmanus/job/pcmanus-10954-testall/] | [dtests|http://cassci.datastax.com/view/Dev/view/pcmanus/job/pcmanus-10954-dtest/] |
bq. about the code block in org.apache.cassandra.cql3.Lists:362, there is an if/else if but there is no final else block to catch all other alternatives, is it intended
It is intended. The only case left is when {{value == UNSET_BYTE_BUFFER}} and in that case we want by definition do nothing.
> [Regression] Error when removing list element with UPDATE statement
> -------------------------------------------------------------------
>
> Key: CASSANDRA-10954
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10954
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths
> Environment: Cassandra 3.0.0, Cassandra 3.1.1
> Reporter: DOAN DuyHai
> Assignee: Sylvain Lebresne
> Fix For: 3.0.x, 3.x
>
>
> Steps to reproduce:
> {code:sql}
> CREATE TABLE simple(
> id int PRIMARY KEY,
> int_list list<int>
> );
> INSERT INTO simple(id, int_list) VALUES(10, [1,2,3]);
> SELECT * FROM simple;
> id | int_list
> ----+-----------
> 10 | [1, 2, 3]
> UPDATE simple SET int_list[0]=null WHERE id=10;
> ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.AssertionError">
> {code}
> Per CQL semantics, setting a column to NULL == deleting it.
> When using debugger, below is the Java stack trace on server side:
> {noformat}
> ERROR o.apache.cassandra.transport.Message - Unexpected exception during request; channel = [id: 0x6dbc33bd, /192.168.51.1:57723 => /192.168.51.1:9473]
> java.lang.AssertionError: null
> at org.apache.cassandra.db.rows.BufferCell.<init>(BufferCell.java:49) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.db.rows.BufferCell.tombstone(BufferCell.java:88) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.UpdateParameters.addTombstone(UpdateParameters.java:141) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.UpdateParameters.addTombstone(UpdateParameters.java:136) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.Lists$SetterByIndex.execute(Lists.java:362) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.statements.UpdateStatement.addUpdateForKey(UpdateStatement.java:94) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.statements.ModificationStatement.addUpdates(ModificationStatement.java:666) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.statements.ModificationStatement.getMutations(ModificationStatement.java:606) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.statements.ModificationStatement.executeWithoutCondition(ModificationStatement.java:413) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.statements.ModificationStatement.execute(ModificationStatement.java:401) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:206) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:472) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:449) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:130) ~[cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507) [cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401) [cassandra-all-3.1.1.jar:3.1.1]
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32) [netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324) [netty-all-4.0.23.Final.jar:4.0.23.Final]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_60-ea]
> at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) [cassandra-all-3.1.1.jar:3.1.1]
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [cassandra-all-3.1.1.jar:3.1.1]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60-ea]
> {noformat}
> The root cause seems to be located at *org.apache.cassandra.cql3.Lists:362* :
> {code:java}
> CellPath elementPath = existingRow.getComplexColumnData(column).getCellByIndex(idx).path();
> if (value == null)
> {
> params.addTombstone(column);
> }
> else if (value != ByteBufferUtil.UNSET_BYTE_BUFFER)
> {
> params.addCell(column, elementPath, value);
> }
> {code}
> In the if block, it seems we do not pass the CellPath as it should be and it makes the asertion _assert column.isComplex() == (path != null);_ fails at
> *org.apache.cassandra.db.rows:49*
> {code:java}
> public BufferCell(ColumnDefinition column, long timestamp, int ttl, int localDeletionTime, ByteBuffer value, CellPath path)
> {
> super(column);
> assert column.isComplex() == (path != null);
> ....
> }
> {code}
> Another remark about the code block in *org.apache.cassandra.cql3.Lists:362*, there is an *if/else if* but there is no final *else* block to catch all other alternatives, is it *intended* or just an oversight ?
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