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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2014) Can't delete whole row from Hadoop MapReduce
Date Tue, 25 Jan 2011 14:11:45 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2014:
--------------------------------------

         Reviewer: stuhood
    Fix Version/s: 0.7.1

> Can't delete whole row from Hadoop MapReduce
> --------------------------------------------
>
>                 Key: CASSANDRA-2014
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2014
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 0.7.0
>         Environment: Debian Linux 2.6.32 amd64
>            Reporter: Patrik Modesto
>             Fix For: 0.7.1
>
>         Attachments: 2014-mr-delete-whole-row.patch
>
>
> ColumnFamilyRecordWriter.java doesn't support Mutation with Deletion without slice_predicat
and super_column to delete whole row. The other way I tried is to specify SlicePredicate with
empty start and finish and I got:
> {code}
> java.io.IOException: InvalidRequestException(why:Deletion does not yet support SliceRange
predicates.)
>         at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:355)
> {code}
> I tryied to patch the ColumnFamilyRecordWriter.java like this:
> {code}
> --- a/src/java/org/apache/cassandra/hadoop/ColumnFamilyRecordWriter.java
> +++ b/src/java/org/apache/cassandra/hadoop/ColumnFamilyRecordWriter.java
> @@ -166,10 +166,17 @@ implements org.apache.hadoop.mapred.RecordWriter<ByteBuffer,List<org.apache.cass
>              // deletion
>              Deletion deletion = new Deletion(amut.deletion.timestamp);
>              mutation.setDeletion(deletion);
> +
>              org.apache.cassandra.avro.SlicePredicate apred = amut.deletion.predicate;
> -            if (amut.deletion.super_column != null)
> +            if (apred == null && amut.deletion.super_column == null)
> +            {
> +                // epmty; delete whole row
> +            }
> +            else if (amut.deletion.super_column != null)
> +            {
>                  // super column
>                  deletion.setSuper_column(copy(amut.deletion.super_column));
> +            }
>              else if (apred.column_names != null)
>              {
>                  // column names
> {code}
> but that didn't work as well.

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