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https://issues.apache.org/jira/browse/CASSANDRA-3840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-3840:
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Affects Version/s: (was: 1.1)
Assignee: Erik Forsberg
> Use java.io.tmpdir as default output location for BulkRecordWriter
> ------------------------------------------------------------------
>
> Key: CASSANDRA-3840
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3840
> Project: Cassandra
> Issue Type: Improvement
> Components: Hadoop
> Reporter: Erik Forsberg
> Assignee: Erik Forsberg
> Labels: bulkloader
> Fix For: 1.1
>
> Attachments: java.io.tmpdir.patch
>
>
> BulkRecordWriter uses the value of the property
> mapreduce.output.bulkoutputformat.localdir if set, defaulting to value of
> mapred.local.dir if the former is not set.
> However, on a typical production system, mapred.local.dir is set to a list of
> directories. This leads to BulkOutputFormat writing to silly paths such as
> /dir1/,dir2,/dir3,KeySpaceName/CFName
> This has two effects:
> 1) Directory is not removed when job is finished, leading to disk space
> management issues.
> 2) If a new job is run against same keyspacename and CF, it tries to load old
> data + new data.
> Better to use System.getProperty("java.io.tmpdir"), as that is set to an
> attempt-specific temporary directory which is cleaned after the job finishes.
> See http://hadoop.apache.org/common/docs/current/mapred_tutorial.html, under
> "Directory Structure".
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