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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3329) DatanodeDescriptor objects stored in FSImage may be out dated.
Date Tue, 06 May 2008 06:47:56 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-3329:
-------------------------------------

    Attachment: lastBlockLocations.patch

This patch removes the last block locations that were earlier stored in each persistent lease
record. 

> DatanodeDescriptor objects stored in FSImage may be out dated.
> --------------------------------------------------------------
>
>                 Key: HADOOP-3329
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3329
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: dhruba borthakur
>             Fix For: 0.18.0
>
>         Attachments: lastBlockLocations.patch
>
>
> INodeFileUnderConstruction.targets is a DatanodeDescriptor array which stores the locations
for last block.  These DatanodeDescriptors are serialized and stored in the FSImage.  However,
a DatanodeDescriptor contains information like IP address and ports.  These information may
be out dated after a datanode restart.
> We should probably only stored the storageID of a DatanodeDescriptor in FSImage and then
lookup the DatanodeDescriptor object from the datanodeMap.

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