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From "J.Andreina (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9036) In BlockPlacementPolicyWithNodeGroup#chooseLocalStorage , random node is selected eventhough fallbackToLocalRack is true.
Date Thu, 10 Sep 2015 11:06:46 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

J.Andreina updated HDFS-9036:
-----------------------------
    Status: Patch Available  (was: Open)

> In BlockPlacementPolicyWithNodeGroup#chooseLocalStorage , random node is selected eventhough
fallbackToLocalRack is true.
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9036
>                 URL: https://issues.apache.org/jira/browse/HDFS-9036
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: J.Andreina
>            Assignee: J.Andreina
>         Attachments: HDFS-9036.1.patch
>
>
> For example in below clusterMap
> Writer                         = "/d2/r4/n8" which does not have local node.
> Available nodes rack = {"/d2/r4/n7","/d1/r1/n1","/d1/r2/n3","/d2/r3/n6"}
> Current hierarchy in choosing node for first local storage replica is
> 	1. Choose local machine (Not available)
> 	2. Choose Local node group machine (Not available)
> 	3. choose random
> *But instead of choosing random , should choose localrack node first(if fallbackToLocalRack
is true, in example it is "/d2/r4/n7" ) else should go for radom node*



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