The map tasks fail timing out after 600 sec. I am processing one 9 GB file with 16,000,000 records. Each record (think is it as a line) generates hundreds of key value pairs. The job is unusual in that the output of the mapper in terms of records or bytes orders of magnitude larger than the input. I have no idea what is slowing down the job except that the problem is in the writes.
If I change the job to merely bypass a fraction of the context.write statements the job succeeds. This is one map task that failed and one that succeeded - I cannot understand how a write can take so long or what else the mapper might be doing JOB FAILED WITH TIMEOUT *Parser*TotalProteins90,103NumberFragments10,933,089 *FileSystemCounters*HDFS_BYTES_READ67,245,605FILE_BYTES_WRITTEN444,054,807 *Map-Reduce Framework*Combine output records10,033,499Map input records 90,103Spilled Records10,032,836Map output bytes3,520,182,794Combine input records10,844,881Map output records10,933,089 Same code but fewer writes JOB SUCCEEDED *Parser*TotalProteins90,103NumberFragments206,658,758 *FileSystemCounters*FILE_BYTES_READ111,578,253HDFS_BYTES_READ67,245,607 FILE_BYTES_WRITTEN220,169,922 *Map-Reduce Framework*Combine output records4,046,128Map input records90,103Spilled Records4,046,128Map output bytes662,354,413Combine input records4,098,609Map output records2,066,588 Any bright ideas -- Steven M. Lewis PhD 4221 105th Ave NE Kirkland, WA 98033 206-384-1340 (cell) Skype lordjoe_com
