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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14444) Got NPE when querying Cassandra 3.11.2
Date Tue, 23 Oct 2018 03:26:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660013#comment-16660013
] 

Jeff Jirsa commented on CASSANDRA-14444:
----------------------------------------

Everyone satisfied this is a dupe of  CASSANDRA-10880 ?  Can I close it as such? 


> Got NPE when querying Cassandra 3.11.2
> --------------------------------------
>
>                 Key: CASSANDRA-14444
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14444
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>         Environment: Ubuntu 14.04, JDK 1.8.0_171. 
> Cassandra 3.11.2
>            Reporter: Xiaodong Xie
>            Assignee: Xiaodong Xie
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 3.11.x
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> We just upgraded our Cassandra cluster from 2.2.6 to 3.11.2
> After upgrading, we immediately got exceptions in Cassandra like this one: 
>  
> {code}
> ERROR [Native-Transport-Requests-1] 2018-05-11 17:10:21,994 QueryMessage.java:129 - Unexpected
error during query
> java.lang.NullPointerException: null
> at org.apache.cassandra.dht.RandomPartitioner.getToken(RandomPartitioner.java:248) ~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.dht.RandomPartitioner.decorateKey(RandomPartitioner.java:92)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.config.CFMetaData.decorateKey(CFMetaData.java:666) ~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.service.pager.PartitionRangeQueryPager.<init>(PartitionRangeQueryPager.java:44)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.db.PartitionRangeReadCommand.getPager(PartitionRangeReadCommand.java:268)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.statements.SelectStatement.getPager(SelectStatement.java:475)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:288)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:118)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:224)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:255) ~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:240) ~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:116)
~[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:517) [apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:410) [apache-cassandra-3.11.2.jar:3.11.2]
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[netty-all-4.0.44.Final.jar:4.0.44.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:357)
[netty-all-4.0.44.Final.jar:4.0.44.Final]
> at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:35)
[netty-all-4.0.44.Final.jar:4.0.44.Final]
> at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:348)
[netty-all-4.0.44.Final.jar:4.0.44.Final]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_171]
> at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
[apache-cassandra-3.11.2.jar:3.11.2]
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) [apache-cassandra-3.11.2.jar:3.11.2]
> at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
> {code}
>  
> The table schema is like:
> {code}
> CREATE TABLE example.example_table (
>  id bigint,
>  hash text,
>  json text,
>  PRIMARY KEY (id, hash)
> ) WITH COMPACT STORAGE
> {code}
>  
> The query is something like:
> {code}
> "select * from example.example_table;" // (We do know this is bad practise, and we
are trying to fix that right now)
> {code}
> with fetch-size as 200, using DataStax Java driver. 
> This table contains about 20k rows. 
>  
> Actually, the fix is quite simple, 
>  
> {code}
> --- a/src/java/org/apache/cassandra/service/pager/PagingState.java
> +++ b/src/java/org/apache/cassandra/service/pager/PagingState.java
> @@ -46,7 +46,7 @@ public class PagingState
> public PagingState(ByteBuffer partitionKey, RowMark rowMark, int remaining, int remainingInPartition)
>  {
> - this.partitionKey = partitionKey;
> + this.partitionKey = partitionKey == null ? ByteBufferUtil.EMPTY_BYTE_BUFFER : partitionKey;
>  this.rowMark = rowMark;
>  this.remaining = remaining;
>  this.remainingInPartition = remainingInPartition;
> {code}
>  
> "partitionKey == null ? ByteBufferUtil.EMPTY_BYTE_BUFFER : partitionKey;" is in 2.2.6
and 2.2.8. But it was removed for some reason. 
> The interesting part is that, we have: 
> {code}
> public final ByteBuffer partitionKey; // Can be null for single partition queries.
> {code}
> It seems "partitionKey" could be null.
> Thanks a lot. 
>  
>  
>  



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