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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11450) HDFS specific network topology classes with storage type info included
Date Fri, 18 Aug 2017 19:47:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133545#comment-16133545
] 

Arpit Agarwal commented on HDFS-11450:
--------------------------------------

bq. Seems like this one also used HDFS-11419 rather than HDFS-11450 in the commit message.
Yes I used a bad commit message for a couple of Jiras, my apologies.

I have also committed this to branch-2 via HDFS-11482.



> HDFS specific network topology classes with storage type info included
> ----------------------------------------------------------------------
>
>                 Key: HDFS-11450
>                 URL: https://issues.apache.org/jira/browse/HDFS-11450
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>             Fix For: 2.9.0, 3.0.0-alpha4
>
>         Attachments: HDFS-11450.001.patch, HDFS-11450.002.patch, HDFS-11450.003.patch,
HDFS-11450.004.patch
>
>
> This JIRA adds storage type info into network topology.
> More specifically, this JIRA adds a storage type map by extending {{InnerNodeImpl}} to
describe the available storages under the current node's subtree. This map is updated when
a node is added/removed from the subtree.
> With this info, when choosing a random node with storage type requirement, the search
could then decide to/not to go deeper into a subtree by examining the available storage types
first.
> One to-do item still, is that, we might still need to separately handle the cases where
a Datanodes restarts, or a disk is hot-swapped, will file another JIRA in that case.



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