Haiyang Jiang created HADOOP-9022: ------------------------------------- Summary: Hadoop distcp tool fails to copy file if -m 0 specified Key: HADOOP-9022 URL: https://issues.apache.org/jira/browse/HADOOP-9022 Project: Hadoop Common Issue Type: Bug Affects Versions: 0.23.4, 0.23.3, 0.23.1 Reporter: Haiyang Jiang
When trying to copy file using distcp on H23, if -m 0 is specified, distcp will just spawn 0 mapper tasks and the file will not be copied. But this used to work before H23, even when -m 0 specified, distcp will always copy the files. Checked the code of DistCp.java Before the rewrite, it set the number maps at least to 1 job.setNumMapTasks(Math.max(numMaps, 1)); But in the newest code, it just takes the input from user: job.getConfiguration().set(JobContext.NUM_MAPS, String.valueOf(inputOptions.getMaxMaps())); -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira