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From William Oberman <ober...@civicscience.com>
Subject Re: Cassandra 0.7.4 and LOCAL_QUORUM Consistency level
Date Wed, 20 Apr 2011 01:25:44 GMT
Good point, should have read your message (and the code) more closely!

Sent from my iPhone

On Apr 19, 2011, at 9:16 PM, Oleg Tsvinev <oleg.tsvinev@gmail.com> wrote:

> I'm puzzled because code does not even check for LOCAL_QUORUM before
> throwing exception.
> Indeed I did not configure NetworkTopologyStrategy. Are you saying
> that it works after configuring it?
>
> On Tue, Apr 19, 2011 at 6:04 PM, William Oberman
> <oberman@civicscience.com> wrote:
>> I had a similar error today when I tried using LOCAL_QUORUM without having a
>> properly configured NetworkTopologyStrategy.  QUORUM worked fine however.
>> will
>>
>> On Tue, Apr 19, 2011 at 8:52 PM, Oleg Tsvinev <oleg.tsvinev@gmail.com>
>> wrote:
>>>
>>> Earlier I've posted the same message to a hector-users list.
>>>
>>> Guys,
>>>
>>> I'm a bit puzzled today. I'm using just released Hector 0.7.0-29
>>> (thank you, Nate!) and Cassandra 0.7.4 and getting the exception
>>> below, marked as (1) Exception. When I dig to Cassandra source code
>>> below, marked as (2) Cassandra source, I see that there's no check for
>>> LOCAL_QUORUM. I also see that (3) cassandra.thrift defines
>>> LOCAL_QUORUM as enum value 3 and in debugger, I see that LOCAL_QUORUM
>>> is a valid enum value.
>>>
>>> My question is, how is it possible to use LOCAL_QUORUM if Cassandra
>>> code throws exception when it sees it? Is it a bad merge or something?
>>> I know it worked before, from looking at
>>> https://issues.apache.org/jira/browse/CASSANDRA-2254
>>>
>>> :-\
>>>
>>> (1) Exception:
>>>
>>> 2011-04-19 14:57:33,550 [pool-2-thread-49] ERROR
>>> org.apache.cassandra.thrift.Cassandra$Processor - Internal error
>>> processing batch_mutate
>>> java.lang.UnsupportedOperationException: invalid consistency level:
>>> LOCAL_QUORUM
>>>       at
>>> org.apache.cassandra.service.WriteResponseHandler.determineBlockFor(WriteResponseHandler.java:99)
>>>       at
>>> org.apache.cassandra.service.WriteResponseHandler.<init>(WriteResponseHandler.java:48)
>>>       at
>>> org.apache.cassandra.service.WriteResponseHandler.create(WriteResponseHandler.java:61)
>>>       at
>>> org.apache.cassandra.locator.AbstractReplicationStrategy.getWriteResponseHandler(AbstractReplicationStrategy.java:127)
>>>       at
>>> org.apache.cassandra.service.StorageProxy.mutate(StorageProxy.java:115)
>>>       at
>>> org.apache.cassandra.thrift.CassandraServer.doInsert(CassandraServer.java:415)
>>>       at
>>> org.apache.cassandra.thrift.CassandraServer.batch_mutate(CassandraServer.java:388)
>>>       at
>>> org.apache.cassandra.thrift.Cassandra$Processor$batch_mutate.process(Cassandra.java:3036)
>>>       at
>>> org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2555)
>>>       at
>>> org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:206)
>>>       at
>>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>       at
>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>       at java.lang.Thread.run(Thread.java:662)
>>>
>>> (2) Cassandra source (line 99 is throw statement)
>>>
>>>   protected int determineBlockFor(String table)
>>>   {
>>>       int blockFor = 0;
>>>       switch (consistencyLevel)
>>>       {
>>>           case ONE:
>>>               blockFor = 1;
>>>               break;
>>>           case ANY:
>>>               blockFor = 1;
>>>               break;
>>>           case TWO:
>>>               blockFor = 2;
>>>               break;
>>>           case THREE:
>>>               blockFor = 3;
>>>               break;
>>>           case QUORUM:
>>>               blockFor = (writeEndpoints.size() / 2) + 1;
>>>               break;
>>>           case ALL:
>>>               blockFor = writeEndpoints.size();
>>>               break;
>>>           default:
>>>               throw new UnsupportedOperationException("invalid
>>> consistency level: " + consistencyLevel.toString());
>>>       }
>>>       // at most one node per range can bootstrap at a time, and
>>> these will be added to the write until
>>>       // bootstrap finishes (at which point we no longer need to
>>> write to the old ones).
>>>       assert 1 <= blockFor && blockFor <= 2 *
>>> Table.open(table).getReplicationStrategy().getReplicationFactor()
>>>           : String.format("invalid response count %d for replication
>>> factor %d",
>>>                           blockFor,
>>> Table.open(table).getReplicationStrategy().getReplicationFactor());
>>>       return blockFor;
>>>   }
>>>
>>> (3) cassandra.thrift:
>>>
>>> enum ConsistencyLevel {
>>>   ONE = 1,
>>>   QUORUM = 2,
>>>   LOCAL_QUORUM = 3,
>>>   EACH_QUORUM = 4,
>>>   ALL = 5,
>>>   ANY = 6,
>>>   TWO = 7,
>>>   THREE = 8,
>>> }
>>
>>
>>
>> --
>> Will Oberman
>> Civic Science, Inc.
>> 3030 Penn Avenue., First Floor
>> Pittsburgh, PA 15201
>> (M) 412-480-7835
>> (E) oberman@civicscience.com
>>

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