Default replication level mapred.submit.replication=10 causes warnings on small clusters ----------------------------------------------------------------------------------------
Key: MAPREDUCE-2845 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2845 Project: Hadoop Map/Reduce Issue Type: Bug Components: client, distributed-cache Affects Versions: 0.20.1 Environment: Cloudera CDH 2 (hadoop-0.20 0.20.1+169.127-1~lenny-cdh2) Reporter: Christoph Schmitz Priority: Minor By default, the replication level for job jars, libjars and the distributed cache in general is mapred.submit.replication=10. This yields under-replication warnings for these files on small clusters (less than 10 data nodes) when using fsck ("hadoop fsck") on their HDFS. Example on an 8-node cluster: {quote} /tmp/hadoop/mapred/system/job_201105191458_1857/job.jar: Under replicated blk_-6996370258385460742_366223. Target Replicas is 10 but found 8 replica(s). {quote} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira