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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2795) HA: Standby NN takes a long time to recover from a dead DN starting up
Date Tue, 17 Jan 2012 03:22:44 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2795.
-------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Committed to branch. I fixed the "20" to "5", good catch.
                
> HA: Standby NN takes a long time to recover from a dead DN starting up
> ----------------------------------------------------------------------
>
>                 Key: HDFS-2795
>                 URL: https://issues.apache.org/jira/browse/HDFS-2795
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2795.txt
>
>
> To reproduce:
> # Start an HA cluster with a DN.
> # Write several blocks to the FS with replication 1.
> # Shutdown the DN
> # Wait for the NNs to declare the DN dead. All blocks will be under-replicated.
> # Restart the DN.
> Note that upon restarting the DN, the active NN will immediately get all block locations
from the initial BR. The standby NN will not, and instead will slowly add block locations
for a subset of the previously-missing blocks on every DN heartbeat.

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