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Date: Thu, 10 May 2012 22:52:48 +0000 (UTC)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8361) avoid out-of-memory problems when
 deserializing strings
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    [ https://issues.apache.org/jira/browse/HADOOP-8361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272865#comment-13272865 ] 

Eli Collins commented on HADOOP-8361:
-------------------------------------

Block locations change is HADOOP-8388.
                
> avoid out-of-memory problems when deserializing strings
> -------------------------------------------------------
>
>                 Key: HADOOP-8361
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8361
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HADOOP-8361.001.patch, HADOOP-8361.002.patch, HADOOP-8361.003.patch, HADOOP-8361.004.patch, HADOOP-8361.005.patch, HADOOP-8361.006.patch
>
>
> In HDFS, we want to be able to read the edit log without crashing on an OOM condition.  Unfortunately, we currently cannot do this, because there are no limits on the length of certain data types we pull from the edit log.  We often read strings without setting any upper limit on the length we're prepared to accept.
> It's not that we don't have limits on strings-- for example, HDFS limits the maximum path length to 8000 UCS-2 characters.  Linux limits the maximum user name length to either 64 or 128 bytes, depending on what version you are running.  It's just that we're not exposing these limits to the deserialization functions that need to be aware of them.

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