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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CASSANDRA-440) get_key_range problems when a node is down
Date Tue, 15 Sep 2009 02:55:57 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-440.
--------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.5
                   0.4

committed to 0.4 and 0.5 branches

> get_key_range problems when a node is down
> ------------------------------------------
>
>                 Key: CASSANDRA-440
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-440
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.4, 0.5
>         Environment: 64-bit 4GB Rackspace-cloud boxes running FC11 (saw problem on 32-bit
platform as well)
>            Reporter: Simon Smith
>            Assignee: Jonathan Ellis
>             Fix For: 0.4, 0.5
>
>         Attachments: 440.patch
>
>
> I'm running Cassandra on 5 nodes using the
> OrderPreservingPartitioner, and have populated Cassandra with 78
> records, and I can use get_key_range via Thrift just fine.  Then, if I
> manually kill one of the nodes (if I kill off node #5), the node (node
> #1) which I've been using to call get_key_range will timeout and the
> error:
>  Thrift: Internal error processing get_key_range
> The Cassandra output traceback:
> ERROR - Encountered IOException on connection:
> java.nio.channels.SocketChannel[closed]
> java.net.ConnectException: Connection refused
>        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592)
>        at org.apache.cassandra.net.TcpConnection.connect(TcpConnection.java:349)
>        at org.apache.cassandra.net.SelectorManager.doProcess(SelectorManager.java:131)
>        at org.apache.cassandra.net.SelectorManager.run(SelectorManager.java:98)
> WARN - Closing down connection java.nio.channels.SocketChannel[closed]
> ERROR - Internal error processing get_key_range
> java.lang.RuntimeException: java.util.concurrent.TimeoutException:
> Operation timed out.
>        at org.apache.cassandra.service.StorageProxy.getKeyRange(StorageProxy.java:573)
>        at org.apache.cassandra.service.CassandraServer.get_key_range(CassandraServer.java:595)
>        at org.apache.cassandra.service.Cassandra$Processor$get_key_range.process(Cassandra.java:853)
>        at org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:606)
>        at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
>        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:675)
> Caused by: java.util.concurrent.TimeoutException: Operation timed out.
>        at org.apache.cassandra.net.AsyncResult.get(AsyncResult.java:97)
>        at org.apache.cassandra.service.StorageProxy.getKeyRange(StorageProxy.java:569)
>        ... 7 more
> The error starts as soon as the downed node #5 goes down and lasts
> until I restart the downed node #5.
> bin/nodeprobe cluster is accurate (it knows quickly when #5 is down,
> and when it is up again)
> Since I set the replication set to 3, I'm confused as to why (after
> the first few seconds or so) there is an error just because one host
> is down temporarily.
> (Jonathan Ellis and I discussed this on the mailing list, let me know if more information
is needed.)

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