I read that the Hadoop Map tasks write their output to local disk.
Suppose if i have map only tasks without any reducers, still the map outputs will be written to local file system ?
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I read that the Hadoop Map tasks write their output to local disk.
Suppose if i have map only tasks without any reducers, still the map outputs will be written to local file system ?
Yes, it will still write the output to the path set by FileOutputFormat.setOutputPath(JobConf, Path) and there will no sorting or partitioning.
More info:
UPDATE: As mentioned by Chris White, it will be written directly to HDFS and not the local file system.