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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11190) Namenode support for data stored in external stores.
Date Thu, 16 Mar 2017 00:16:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Virajith Jalaparti updated HDFS-11190:
--------------------------------------
    Attachment: HDFS-11190-HDFS-9806.001.patch

Posting a patch that enables this functionality on the NN. The main changes include:
a) Adding a {{LocatedBlockBuilder}} that is used to build {{LocatedBlocks}}. 
b) Adding a {{ProvidedBlocksBuilder}} as a subclass of {{LocatedBlockBuilder}}, which is used
to build {{LocatedBlocks}} for provided blocks -- the {{ProvidedBlocksBuilder}} assigns a
randomly chosen Datanode (which reports as provided volume) as the location of the provided
blocks. 
c) Adding a {{ProvidedStorageMap}} which is used to keep track of datanodes with provided
volumes
d) Modifications to the {{BlockManager}} to use {{LocatedBlockBuilder}} to build {{LocatedBlocks}}
and use {{ProvidedStorageMap}} while processing reports from datanodes. 


> Namenode support for data stored in external stores.
> ----------------------------------------------------
>
>                 Key: HDFS-11190
>                 URL: https://issues.apache.org/jira/browse/HDFS-11190
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Virajith Jalaparti
>         Attachments: HDFS-11190-HDFS-9806.001.patch
>
>
> The goal of this JIRA is to enable the Namenode to know about blocks that are in {{PROVIDED}}
stores and are not necessarily stored on any Datanodes. 



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