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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2013/09/11 19:48:02 UTC
[jira] [Assigned] (CASSANDRA-6004) Performing a "Select count(*)"
when replication factor < node count causes assertion error and timeout
[ https://issues.apache.org/jira/browse/CASSANDRA-6004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Brandon Williams reassigned CASSANDRA-6004:
-------------------------------------------
Assignee: Sylvain Lebresne
> Performing a "Select count(*)" when replication factor < node count causes assertion error and timeout
> ------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-6004
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6004
> Project: Cassandra
> Issue Type: Bug
> Components: API
> Environment: Two node setup
> Ubuntu Server 12.04
> Tested on JDK 1.6 and 1.7
> Reporter: James P
> Assignee: Sylvain Lebresne
>
> When performing a "Select Count()" query on a table belonging to a keyspace with a replication factor less than the total node count, the following error is encountered which ultimately results in an rpc_timeout for the request:
> ERROR 18:47:54,660 Exception in thread Thread[Thread-5,5,main]
> java.lang.AssertionError
> at org.apache.cassandra.db.filter.IDiskAtomFilter$Serializer.deserialize(IDiskAtomFilter.java:116)
> at org.apache.cassandra.db.RangeSliceCommandSerializer.deserialize(RangeSliceCommand.java:247)
> at org.apache.cassandra.db.RangeSliceCommandSerializer.deserialize(RangeSliceCommand.java:156)
> at org.apache.cassandra.net.MessageIn.read(MessageIn.java:99)
> at org.apache.cassandra.net.IncomingTcpConnection.receiveMessage(IncomingTcpConnection.java:148)
> at org.apache.cassandra.net.IncomingTcpConnection.handleModernVersion(IncomingTcpConnection.java:125)
> at org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:73)
> The issue is not encountered when the replication factor is >= node count
> To replicate the issue:
> 1) Create the keyspace: CREATE KEYSPACE demodb WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor': 1};
> 2) Create the table CREATE TABLE users (
> user_name varchar,
> password varchar,
> gender varchar,
> session_token varchar,
> state varchar,
> birth_year bigint,
> PRIMARY KEY (user_name));
> 3) Do a CQL query: "SELECT count( * ) FROM demodb.users" ;
> The issue is reproducible even if the table is empty. Both CQLSH and client (astyanax) api calls are affected. Tested on two different clusters (2-node and 8-node)
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