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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6440) Support more than 2 NameNodes
Date Thu, 21 May 2015 08:01:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesse Yates updated HDFS-6440:
------------------------------
    Attachment: hdfs-6440-trunk-v4.patch

Attaching updated patch. Working through some local test failures - seem like they might be
just due to rebase changes? Looking into it.

Changes of note:
* fixing concurrent checkpoint management - was breaking TestRollingUpgrade - to not keep
around completed checkpoints
* Adding tests to TestRollingUpgrade
 Removing random seed setting in testpipelinesfailover
* Fixing startup option setting in minidfscluster#restartNode
* Fixing block manager to use correct nnid lookup

FYI, on vacation through memorial day, so not going to be doing much for the next few days.
Back on Tuesday.

> Support more than 2 NameNodes
> -----------------------------
>
>                 Key: HDFS-6440
>                 URL: https://issues.apache.org/jira/browse/HDFS-6440
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: auto-failover, ha, namenode
>    Affects Versions: 2.4.0
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>             Fix For: 3.0.0
>
>         Attachments: Multiple-Standby-NameNodes_V1.pdf, hdfs-6440-cdh-4.5-full.patch,
hdfs-6440-trunk-v1.patch, hdfs-6440-trunk-v1.patch, hdfs-6440-trunk-v3.patch, hdfs-6440-trunk-v4.patch,
hdfs-multiple-snn-trunk-v0.patch
>
>
> Most of the work is already done to support more than 2 NameNodes (one active, one standby).
This would be the last bit to support running multiple _standby_ NameNodes; one of the standbys
should be available for fail-over.
> Mostly, this is a matter of updating how we parse configurations, some complexity around
managing the checkpointing, and updating a whole lot of tests.



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