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Date: Thu, 13 Sep 2007 14:50:32 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-1774) Remove use of INode.parent in Block
 CRC upgrade
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    [ https://issues.apache.org/jira/browse/HADOOP-1774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527287 ] 

Hadoop QA commented on HADOOP-1774:
-----------------------------------

-1, build or testing failed

2 attempts failed to build and test the latest attachment http://issues.apache.org/jira/secure/attachment/12365759/HADOOP-1774-correction.patch against trunk revision r575438.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/753/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/753/console

Please note that this message is automatically generated and may represent a problem with the automation system and not the patch.

> Remove use of INode.parent in Block CRC upgrade
> -----------------------------------------------
>
>                 Key: HADOOP-1774
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1774
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.15.0
>
>         Attachments: HADOOP-1774-correction.patch, HADOOP-1774.patch, HADOOP-1774.patch, HADOOP-1774.patch
>
>
> HADOOP-1687 proposes various reductions in Namenode memory. One of the 'cuts' is to remove 'parent' field in INodes (8 bytes per file). HADOOP-1743 already deprecates INode.getAbsoluteName() method. 
> Block CRC Upgrade code still requires this field (blockID -> fileName -> parent -> INode for .crc file). If we don't want to use parent, we need to build INode-to-parent map at the beginning of the upgrade. Note this would increase memory required during upgrade by 50 bytes for each of non-crc files (50% of files). I would estimate this to be around 5% more memory. 

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