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https://issues.apache.org/jira/browse/HADOOP-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12474975
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Devaraj Das commented on HADOOP-1012:
-------------------------------------
This is related to the issue HADOOP-1027
> 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
> Assigned To: Devaraj Das
> 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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