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Date: Thu, 23 Aug 2007 16:20:30 -0700 (PDT)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Created: (HADOOP-1774) Remove use of INode.parent in Block
 CRC upgrade
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Remove use of INode.parent in Block CRC upgrade
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                 Key: HADOOP-1774
                 URL: https://issues.apache.org/jira/browse/HADOOP-1774
             Project: Hadoop
          Issue Type: Improvement
            Reporter: Raghu Angadi
             Fix For: 0.15.0


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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