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From "Thibaut (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4976) Mapper runs out of memory
Date Mon, 26 Jan 2009 20:11:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thibaut updated HADOOP-4976:
----------------------------


Try increasing the child heap size in the hadoop-site.xml configuration file.

> Mapper runs out of memory
> -------------------------
>
>                 Key: HADOOP-4976
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4976
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>         Environment: Amazon EC2 Extra Large instance (4 cores, 15 GB RAM), Sun Java 6
(1.6.0_10); 1 Master, 4 Slaves (all the same); each Java process takes the argument "-Xmx700m"
(2 Java processes per Instance)
>            Reporter: Richard J. Zak
>             Fix For: 0.19.1
>
>
> The hadoop job has the task of processing 4 directories in HDFS, each with 15 files.
 This is sample data, a test run, before I go to the needed 5 directories of about 800 documents
each.  The mapper takes in nearly 200 pages (not files) and throws an OutOfMemory exception.
 The largest file is 17 MB.
> If this problem is something on my end and not truly a bug, I apologize.  However, after
Googling a bit, I did see many threads of people running out of memory with small data sets.

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