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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3050) Cluster fall into infinite loop trying to replicate a block to a target that aready has this replica.
Date Wed, 02 Apr 2008 18:53:25 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HADOOP-3050:
----------------------------------

    Attachment: blockReport1.patch

I ended up fixing more problems associated with sending block reports.
1. Datanode does not send the inital block report until requested by the namenode;
2. namenode asks a datanode to send a block report when the datanode's network location is
resolved as a reply to a heartbeat;
3. Add a static field R of type Random to DataNode and replace all the use of new Random()
with R.

> Cluster fall into infinite loop trying to replicate a block to a target that aready has
this replica.
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3050
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3050
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Konstantin Shvachko
>            Assignee: Hairong Kuang
>            Priority: Blocker
>         Attachments: blockReport.patch, blockReport1.patch, FailedTestDecommission.log
>
>
> This happened during a test run by Hudson. So fortunately we have all logs present.
> http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1987/console
> Search for TestDecommission. And look for block blk_167544198419718831 that is being
replicated to node 127.0.0.1:65168 over and over again.
> The issue needs to be investigated. I am making it a blocker until it is.

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