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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/09/18 17:15:08 UTC
[jira] [Commented] (CASSANDRA-4675) NPE in NTS when using LQ
against a node (DC) that doesn't have replica
[ https://issues.apache.org/jira/browse/CASSANDRA-4675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457883#comment-13457883 ]
Jonathan Ellis commented on CASSANDRA-4675:
-------------------------------------------
Not sure what version this stacktrace is supposed to be against. Doesn't appear to be against a recent 1.0 or 1.1.
> NPE in NTS when using LQ against a node (DC) that doesn't have replica
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-4675
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4675
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jackson Chung
> Priority: Minor
>
> in a NetworkTopologyStrategy where there are 2 DC:
> {panel}
> Address DC Rack Status State Load Owns Token
> 85070591730234615865843651857942052864
> 127.0.0.1 dc1 r1 Up Normal 115.78 KB 50.00% 0
> 127.0.0.2 dc2 r1 Up Normal 129.3 KB 50.00% 85070591730234615865843651857942052864
> {panel}
> I have a KS that has replica is 1 of the dc (dc1):
> {panel}
> [default@unknown] describe Keyspace3;
> Keyspace: Keyspace3:
> Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
> Durable Writes: true
> Options: [dc1:1]
> Column Families:
> ColumnFamily: testcf
> {panel}
> But if I connect to a node in dc2, using LOCAL_QUORUM, I get NPE in the Cassandra node's log:
> {panel}
> [default@unknown] consistencylevel as LOCAL_QUORUM;
> Consistency level is set to 'LOCAL_QUORUM'.
> [default@unknown] use Keyspace3;
> Authenticated to keyspace: Keyspace3
> [default@Keyspace3] get testcf[utf8('k1')][utf8('c1')];
> Internal error processing get
> org.apache.thrift.TApplicationException: Internal error processing get
> at org.apache.thrift.TApplicationException.read(TApplicationException.java:108)
> at org.apache.cassandra.thrift.Cassandra$Client.recv_get(Cassandra.java:511)
> at org.apache.cassandra.thrift.Cassandra$Client.get(Cassandra.java:492)
> at org.apache.cassandra.cli.CliClient.executeGet(CliClient.java:648)
> at org.apache.cassandra.cli.CliClient.executeCLIStatement(CliClient.java:209)
> at org.apache.cassandra.cli.CliMain.processStatementInteractive(CliMain.java:220)
> at org.apache.cassandra.cli.CliMain.main(CliMain.java:348)
> {panel}
> node2's log:
> {panel}
> ERROR [Thrift:3] 2012-09-17 18:15:16,868 Cassandra.java (line 2999) Internal error processing get
> java.lang.NullPointerException
> at org.apache.cassandra.locator.NetworkTopologyStrategy.getReplicationFactor(NetworkTopologyStrategy.java:142)
> at org.apache.cassandra.service.DatacenterReadCallback.determineBlockFor(DatacenterReadCallback.java:90)
> at org.apache.cassandra.service.ReadCallback.<init>(ReadCallback.java:67)
> at org.apache.cassandra.service.DatacenterReadCallback.<init>(DatacenterReadCallback.java:63)
> at org.apache.cassandra.service.StorageProxy.getReadCallback(StorageProxy.java:775)
> at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:609)
> at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:564)
> at org.apache.cassandra.thrift.CassandraServer.readColumnFamily(CassandraServer.java:128)
> at org.apache.cassandra.thrift.CassandraServer.internal_get(CassandraServer.java:383)
> at org.apache.cassandra.thrift.CassandraServer.get(CassandraServer.java:401)
> at org.apache.cassandra.thrift.Cassandra$Processor$get.process(Cassandra.java:2989)
> at org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
> at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> {panel}
> I could workaround it by adding dc2:0 to the option:
> {panel}
> [default@Keyspace3] describe Keyspace3;
> Keyspace: Keyspace3:
> Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
> Durable Writes: true
> Options: [dc2:0, dc1:1]
> Column Families:
> ColumnFamily: testcf
> {panel}
> Now you get UA:
> {panel}
> [default@Keyspace3] get testcf[utf8('k1')][utf8('c1')];
> null
> UnavailableException()
> at org.apache.cassandra.thrift.Cassandra$get_result.read(Cassandra.java:6506)
> at org.apache.cassandra.thrift.Cassandra$Client.recv_get(Cassandra.java:519)
> at org.apache.cassandra.thrift.Cassandra$Client.get(Cassandra.java:492)
> at org.apache.cassandra.cli.CliClient.executeGet(CliClient.java:648)
> at org.apache.cassandra.cli.CliClient.executeCLIStatement(CliClient.java:209)
> at org.apache.cassandra.cli.CliMain.processStatementInteractive(CliMain.java:220)
> at org.apache.cassandra.cli.CliMain.main(CliMain.java:348)
> {panel}
> On a side note, is there a thought on having a CL.LOCAL_ONE? Ie if local node (wrt the dc) does not have replica, on a LOCAL_ONE, it won't try to go across DC to try to get it. It would be similar to LOCAL_QUORUM.
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