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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1012) OutOfMemoryError in reduce
Date Mon, 12 Feb 2007 22:28:05 GMT
OutOfMemoryError in reduce
--------------------------

                 Key: HADOOP-1012
                 URL: https://issues.apache.org/jira/browse/HADOOP-1012
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.11.1
            Reporter: Nigel Daley
            Priority: Critical


I'm seeing OutOfMemoryErrors from a reduce in each of DFSIO Benchmark and RandomWriter.  No
stack traces are given.  Snipets from the TaskTracker logs are below.  I believe I first saw
this on February 3rd during tests that I run weekly.

=====
DFSIO
=====
...
2007-02-10 18:25:20,201 INFO org.apache.hadoop.mapred.TaskRunner: task_0005_r_000000_0 Copying
of all map outputs complete. Initiating the last merge on the remaining files in ramfs://mapoutput9105104
2007-02-10 18:25:20,771 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:21,773 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:23,280 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:24,607 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:25,960 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:27,105 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:28,982 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:29,984 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:31,481 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:33,379 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:34,478 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:35,656 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:36,758 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:42,593 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:43,600 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:46,573 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:48,791 INFO org.apache.hadoop.mapred.TaskTracker: task_0005_r_000000_0 0.33333334%
reduce > copy (9000 of 9000 at 0.00 MB/s)
2007-02-10 18:25:49,828 WARN org.apache.hadoop.mapred.TaskRunner: Merge of the inmemory files
threw an exception: java.lang.OutOfMemoryError: Java heap space
...

============
RandomWriter
============
...
2007-02-11 03:58:00,887 INFO org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_3 Copying
of all map outputs complete. Initiating the last merge on the remaining files in ramfs://mapoutput6576294
2007-02-11 03:58:01,681 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:02,921 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:03,923 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:05,375 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:06,742 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:08,818 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:09,821 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:11,406 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:13,277 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:14,280 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:15,282 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:16,284 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:18,401 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:19,403 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:20,636 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:37,860 INFO org.apache.hadoop.mapred.TaskTracker: task_0001_r_000000_3 0.33333334%
reduce > copy (8890 of 8890 at 0.00 MB/s)
2007-02-11 03:58:37,898 WARN org.apache.hadoop.mapred.TaskRunner: task_0001_r_000000_3 Child
Error
java.lang.OutOfMemoryError: Java heap space
...

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