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