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Posted to commits@cassandra.apache.org by "Brandon Williams (Commented) (JIRA)" <ji...@apache.org> on 2012/01/23 20:39:41 UTC
[jira] [Commented] (CASSANDRA-2878) Allow map/reduce to use
server-side query filters
[ https://issues.apache.org/jira/browse/CASSANDRA-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191380#comment-13191380 ]
Brandon Williams commented on CASSANDRA-2878:
---------------------------------------------
Problems running word count:
{noformat}
java.io.IOException: InvalidRequestException(why:(Expected 4 or 0 byte int (8)) [wordcount][output_words][word1] failed validation)
at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:308)
Caused by: InvalidRequestException(why:(Expected 4 or 0 byte int (8)) [wordcount][output_words][word1] failed validation)
at org.apache.cassandra.thrift.Cassandra$batch_mutate_result.read(Cassandra.java:18724)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
at org.apache.cassandra.thrift.Cassandra$Client.recv_batch_mutate(Cassandra.java:862)
at org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:848)
at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:300)
{noformat}
Note: using https://github.com/jbellis/cassandra/tree/2878-rebased
> Allow map/reduce to use server-side query filters
> -------------------------------------------------
>
> Key: CASSANDRA-2878
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2878
> Project: Cassandra
> Issue Type: New Feature
> Components: Hadoop
> Reporter: Mck SembWever
> Assignee: Jonathan Ellis
> Priority: Critical
> Labels: hadoop
> Fix For: 1.1
>
>
> Currently, when running a MapReduce job against data in a Cassandra data store, it reads through all the data for a particular ColumnFamily. This could be optimized to only read through those rows that have to do with the query.
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