Use java.io.tmpdir as default output location for BulkRecordWriter
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Key: CASSANDRA-3840
URL: https://issues.apache.org/jira/browse/CASSANDRA-3840
Project: Cassandra
Issue Type: Improvement
Components: Hadoop
Affects Versions: 1.1
Reporter: Erik Forsberg
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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