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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3368) Missing blocks due to bad DataNodes comming up and down.
Date Sat, 05 May 2012 05:42:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268904#comment-13268904
] 

Todd Lipcon commented on HDFS-3368:
-----------------------------------

bq. Todd, if you want to double "minus heartbeat interval", please get some motivation for
that. I mean why not triple or 1.5 x.

Sure, either of those seem fine too. Just meant to express that using the heartbeat interval
itself may not be right, since the actual receipt of the heart beats may jitter a bit around
the configured value (eg if a DN has to make a block report, or otherwise gets held up by
a couple seconds).
                
> Missing blocks due to bad DataNodes comming up and down.
> --------------------------------------------------------
>
>                 Key: HDFS-3368
>                 URL: https://issues.apache.org/jira/browse/HDFS-3368
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0, 1.0.0, 2.0.0, 3.0.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: blockDeletePolicy.patch
>
>
> All replicas of a block can be removed if bad DataNodes come up and down during cluster
restart resulting in data loss.

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