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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3586) Blocks are not getting replicate even DN's are availble.
Date Mon, 15 Sep 2014 08:08:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133677#comment-14133677
] 

Vinayakumar B commented on HDFS-3586:
-------------------------------------

Hi [~usrikanth],

yes you are right.. HDFS-3493 solves the above issue. this jira can be resolved as duplicate.

as mentioned in HDFS-3493 changes, in following cases corrupt replica will be deleted.

{code}
    // case 1: have enough number of live replicas
    // case 2: corrupted replicas + live replicas > Replication factor
    // case 3: Block is marked corrupt due to failure while writing. In this
    //         case genstamp will be different than that of valid block.
    // In all these cases we can delete the replica.
    // In case of 3, rbw block will be deleted and valid block can be replicated
{code}

> Blocks are not getting replicate even DN's are availble.
> --------------------------------------------------------
>
>                 Key: HDFS-3586
>                 URL: https://issues.apache.org/jira/browse/HDFS-3586
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Brahma Reddy Battula
>            Assignee: amith
>         Attachments: HDFS-3586-analysis.txt
>
>
> Scenario:
> =========
> Started four DN's(Say DN1,DN2,DN3 and DN4)
> writing files with RF=3..
> formed pipeline with DN1->DN2->DN3.
> Since DN3 network is very slow.it's not able to send acks.
> Again pipeline is fromed with DN1->DN2->DN4.
> Here DN4 network is also slow.
> So finally commitblocksync happend tp DN1 and DN2 successfully.
> block present in all the four DN's(finalized state in two DN's and rbw state in another
DN's)..
> Here NN is asking replicate to DN3 and DN4,but it's failing since replcia's are already
present in RBW dir.



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