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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Encountering timeout exception when running get_key_range
Date Tue, 20 Oct 2009 02:24:13 GMT
Can you tell me anything about the nature of your rows?  Many/few
columns?  Large/small column values?

On Mon, Oct 19, 2009 at 9:17 PM, Ramzi Rabah <rrabah@playdom.com> wrote:
> Hi Jonathan
> I actually spoke too early. Now even if I restart the servers it still
> gives a timeout exception.
> As far as the sstable files are, not sure which ones are the sstables,
> but here is the list of files in the data directory that are prepended
> with the column family name:
> DatastoreDeletionSchedule-1-Data.db
> DatastoreDeletionSchedule-1-Filter.db
> DatastoreDeletionSchedule-1-Index.db
> DatastoreDeletionSchedule-5-Data.db
> DatastoreDeletionSchedule-5-Filter.db
> DatastoreDeletionSchedule-5-Index.db
> DatastoreDeletionSchedule-7-Data.db
> DatastoreDeletionSchedule-7-Filter.db
> DatastoreDeletionSchedule-7-Index.db
> DatastoreDeletionSchedule-8-Data.db
> DatastoreDeletionSchedule-8-Filter.db
> DatastoreDeletionSchedule-8-Index.db
>
> I am not currently doing any system stat collection.
>
> On Mon, Oct 19, 2009 at 6:41 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>> How many sstable files are in the data directories for the
>> columnfamily you are querying?
>>
>> How many are there after you restart and it is happy?
>>
>> Are you doing system stat collection with munin or ganglia or some such?
>>
>> On Mon, Oct 19, 2009 at 8:25 PM, Ramzi Rabah <rrabah@playdom.com> wrote:
>>> Hi Jonathan I updated to 4.1 and I still get the same exception when I
>>> call get_key_range.
>>> I checked all the server logs, and there is only one exception being
>>> thrown by whichever server I am connecting to.
>>>
>>> Thanks
>>> Ray
>>>
>>> On Mon, Oct 19, 2009 at 4:52 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>>> No, it's smart enough to avoid scanning.
>>>>
>>>> On Mon, Oct 19, 2009 at 6:49 PM, Ramzi Rabah <rrabah@playdom.com> wrote:
>>>>> Hi Jonathan thanks for the reply, I will update the code to 0.4.1 and
>>>>> will check all the logs on all the machines.
>>>>> Just a simple question, when you do a get_key_range and you specify ""
>>>>> and "" for start and end, and the limit is 25, if there are too many
>>>>> entries, does it do a scan to find out the start or is it smart enough
>>>>> to know what the start key is?
>>>>>
>>>>> On Mon, Oct 19, 2009 at 4:42 PM, Jonathan Ellis <jbellis@gmail.com>
wrote:
>>>>>> You should check the other nodes for potential exceptions keeping
them
>>>>>> from replying.
>>>>>>
>>>>>> Without seeing that it's hard to say if this is caused by an old
bug,
>>>>>> but you should definitely upgrade to 0.4.1 either way :)
>>>>>>
>>>>>> On Mon, Oct 19, 2009 at 5:51 PM, Ramzi Rabah <rrabah@playdom.com>
wrote:
>>>>>>> Hello all,
>>>>>>>
>>>>>>> I am running into problems with get_key_range. I have
>>>>>>> OrderPreservingPartitioner defined in storage-conf.xml and I
am using
>>>>>>> a columnfamily that looks like
>>>>>>>     <ColumnFamily CompareWith="BytesType"
>>>>>>>                   Name="DatastoreDeletionSchedule"
>>>>>>>                   />
>>>>>>>
>>>>>>> My command is client.get_key_range("Keyspace1", "DatastoreDeletionSchedule",
>>>>>>>                    "", "", 25, ConsistencyLevel.ONE);
>>>>>>>
>>>>>>> It usually works fine but after a day or so from server writes
into
>>>>>>> this column family, I started getting
>>>>>>> ERROR [pool-1-thread-36] 2009-10-19 17:24:28,223 Cassandra.java
(line
>>>>>>> 770) 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:560)
>>>>>>>        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:766)
>>>>>>>        at org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:609)
>>>>>>>        at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
>>>>>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
>>>>>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
>>>>>>>        at java.lang.Thread.run(Thread.java:619)
>>>>>>> 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:556)
>>>>>>>        ... 7 more
>>>>>>>
>>>>>>> I still get the timeout exceptions even though the servers have
been
>>>>>>> idle for 2 days. When I restart the cassandra servers, it seems
to
>>>>>>> work fine again. Any ideas what could be wrong?
>>>>>>>
>>>>>>> By the way, I am using version:apache-cassandra-incubating-0.4.0-rc2
>>>>>>> Not sure if this is fixed in the 0.4.1 version
>>>>>>>
>>>>>>> Thanks
>>>>>>> Ray
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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