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https://issues.apache.org/jira/browse/CASSANDRA-6436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paulo Motta updated CASSANDRA-6436:
-----------------------------------
Component/s: Tools
> AbstractColumnFamilyInputFormat does not use start and end tokens configured
> via ConfigHelper.setInputRange()
> -------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-6436
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6436
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: Paulo Motta
> Assignee: Paulo Motta
> Labels: hadoop, patch
> Fix For: 2.0.7
>
> Attachments: cassandra-1.2-6436.txt, cassandra-1.2-6436.txt
>
>
> ConfigHelper allows to set a token input range via the setInputRange(conf,
> startToken, endToken) call (ConfigHelper:254).
> We used this feature to limit a hadoop job range to a single Cassandra node's
> range, or even to single row key, mostly for testing purposes.
> This worked before the fix for CASSANDRA-5536
> (https://github.com/apache/cassandra/commit/aaf18bd08af50bbaae0954d78d5e6cbb684aded9),
> but after this ColumnFamilyInputFormat never uses the value of
> KeyRange.start_token when defining the input splits
> (AbstractColumnFamilyInputFormat:142-160), but only KeyRange.start_key, which
> needs an order preserving partitioner to work.
> I propose the attached fix in order to allow defining Cassandra token ranges
> for a given Hadoop job even when using a non-order preserving partitioner.
> Example use of ConfigHelper.setInputRange(conf, startToken, endToken) to
> limit the range to a single Cassandra Key with RandomPartitioner:
> IPartitioner part = ConfigHelper.getInputPartitioner(job.getConfiguration());
> Token token = part.getToken(ByteBufferUtil.bytes("Cassandra Key"));
> BigInteger endToken = (BigInteger) new
> BigIntegerConverter().convert(BigInteger.class,
> part.getTokenFactory().toString(token));
> BigInteger startToken = endToken.subtract(new BigInteger("1"));
> ConfigHelper.setInputRange(job.getConfiguration(), startToken.toString(),
> endToken.toString());
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