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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8248) Store INodeId instead of the INodeFile object in BlockInfoContiguous
Date Tue, 28 Apr 2015 18:02:06 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Haohui Mai updated HDFS-8248:
-----------------------------
    Attachment: HDFS-8248.002.patch

> Store INodeId instead of the INodeFile object in BlockInfoContiguous
> --------------------------------------------------------------------
>
>                 Key: HDFS-8248
>                 URL: https://issues.apache.org/jira/browse/HDFS-8248
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>         Attachments: HDFS-8248.000.patch, HDFS-8248.001.patch, HDFS-8248.002.patch
>
>
> Currently the namespace and the block manager are tightly coupled together. There are
two couplings in terms of implementation:
> 1. The {{BlockInfoContiguous}} stores a reference of the {{INodeFile}} that owns the
block, so that the block manager can look up the corresponding file when replicating blocks,
recovering from pipeline failures, etc.
> 1. The {{INodeFile}} stores {{BlockInfoContiguous}} objects that the file owns.
> Decoupling the namespace and the block manager allows the BM to be separated out from
the Java heap or even as a standalone process. This jira proposes to remove the first coupling
by storing the id of the inode instead of the object reference of {{INodeFile}} in the {{BlockInfoContiguous}}
class.



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