Hmm, interesting. You're right that it's a bug; those two are
supposed to be equivalent.
On Thu, Dec 30, 2010 at 4:02 PM, Thor Carpenter
<tcarpen...@mediosystems.com> wrote:
> So, I found a solution, but I think there is a (trivial) bug.
>
> The broken keyspace:
>
> create keyspace KeyspaceDC1 with
> replication_factor = 1 and
> placement_strategy =
> 'org.apache.cassandra.locator.NetworkTopologyStrategy' and
> strategy_options = [{DC1:1, DC2:0}];
>
> The fixed keyspace:
>
> create keyspace KeyspaceDC1 with
> replication_factor = 1 and
> placement_strategy =
> 'org.apache.cassandra.locator.NetworkTopologyStrategy' and
> strategy_options = [{DC1:1}];
>
> I'm not sure if the issue is that there are no nodes in DC2 or that I'm
> saying DC2 shouldn't get any replicas, or a combination of the two. If I
> get time I'll try to poke around the code base.
>
> -Thor
>
> On Dec 29, 2010, at 12:38 PM, Thor Carpenter wrote:
>
> In an attempt to replicate this error on a simpler system I have come across
> a different error but seemingly related problem. Now I am getting the
> following exception in system.log.
>
> DEBUG [pool-1-thread-3] 2010-12-29 12:10:38,897 CassandraServer.java (line
> 362) insert
> ERROR [pool-1-thread-3] 2010-12-29 12:10:38,906 Cassandra.java (line 2960)
> Internal error processing insert
> java.lang.AssertionError
> at
> org.apache.cassandra.locator.TokenMetadata.firstTokenIndex(TokenMetadata.java:392)
> at
> org.apache.cassandra.locator.TokenMetadata.ringIterator(TokenMetadata.java:417)
> at
> org.apache.cassandra.locator.NetworkTopologyStrategy.calculateNaturalEndpoints(NetworkTopologyStrategy.java:95)
> at
> org.apache.cassandra.locator.AbstractReplicationStrategy.getNaturalEndpoints(AbstractReplicationStrategy.java:99)
> at
> org.apache.cassandra.service.StorageService.getNaturalEndpoints(StorageService.java:1411)
> at
> org.apache.cassandra.service.StorageService.getNaturalEndpoints(StorageService.java:1394)
> at
> org.apache.cassandra.service.StorageProxy.mutate(StorageProxy.java:109)
> at
> org.apache.cassandra.thrift.CassandraServer.doInsert(CassandraServer.java:442)
> at
> org.apache.cassandra.thrift.CassandraServer.insert(CassandraServer.java:379)
> at
> org.apache.cassandra.thrift.Cassandra$Processor$insert.process(Cassandra.java:2952)
> at
> org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2555)
> at
> org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:167)
> 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:619)
>
> Looking at TokenMetadata.java:392, the assert that is triggered is:
> assert ring.size() > 0;
>
> Which led me to run nodetool ring which outputs a seemingly correct config:
> -sh-3.2$ nodetool -h localhost -p 8080 ring
> Address Status State Load Owns Token
> 10.5.64.26 Up Normal 47.16 KB 100.00% 1
>
>
> To reproduce:
>
> * I have upgraded to 0.7RC3 so install the latest riptano 0.7rc3 rpm on a
> single node in "DC1".
>
> * In cassandra.yaml set initial_token = 1
>
> * cassandra-topology.properties:
>
> 10.5.64.26=DC1:R1
> default=DC2:R1
>
> * Schema loaded via cassandra-cli:
>
> create keyspace KeyspaceDC1 with
> replication_factor = 1 and
> placement_strategy =
> 'org.apache.cassandra.locator.NetworkTopologyStrategy' and
> strategy_options = [{DC1:1, DC2:0}];
>
> use KeyspaceDC1;
>
> create column family TestCF with
> column_type = 'Standard' and
> comparator = 'BytesType' and
> keys_cached = 200000 and
> rows_cached = 2000 and
> gc_grace = 0 and
> read_repair_chance = 0.0;
>
> * In cassandra-cli execute the following:
>
> [defa...@unknown] use KeyspaceDC1;
> Authenticated to keyspace: KeyspaceDC1
> [defa...@keyspacedc1] set TestCF['some key']['some col'] = 'some value';
> Internal error processing insert
>
> * Check system.log where you should find the above assertion error.
>
>
> Can anybody find a flaw in this setup? Do others agree something looks
> buggy?
>
> Thanks,
> -Thor
>
> On Dec 28, 2010, at 4:33 PM, Thor Carpenter wrote:
>
> Third try for good luck. Maybe this time I'll get it all in one email. :-)
>
> At time 15:55 I performed a write with CL = ONE, a subsequent read with CL =
> ONE and received correct results. Similar results occur with any read CL
> other than LOCAL_QUORUM.
>
> At time 15:58 I performed a write with CL = ONE, a subsequent read with CL =
> LOCAL_QUORUM and received a TimedOutException.
>
> System.log and cassandra.log are from server dlc05-sea to corresponds with
> the hector error message "Closing client
> CassandraClient<dlc05-sea:9160-50>". I haven't found anything in the logs
> that indicates the problem but maybe others with more discerning eyes can.
>
> Please let me know if I can provide any additional information.
>
> Thanks,
> -Thor
>
> <logs.zip><ATT00001..txt>
>
>
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
