[
https://issues.apache.org/jira/browse/HDFS-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544653#comment-14544653
]
Aaron T. Myers commented on HDFS-6440:
--------------------------------------
bq. Ah, Ok. Yes, that second set seed will clearly not be used and is
definitely be misleading. Sorry for being dense :-/ I was just looking at the
usage of the Random, not the seed!
No sweat. I figured we were talking past each other a bit.
bq. I'm thinking to just pull the better log message up to the static
initialization and remove the those two lines (4-5).
I agree, this seems like the right move to me. Just have a single seed for the
whole test class. Possible that we may at some point encounter some inter-test
dependencies, and if so it'll be nice that there's only a single seed used
across all the tests, instead of having to manually set several seeds to
reproduce the same sequence. The fact that we already clearly log which NN is
becoming active should be sufficient for reproducing individual test failures
if one wants to do that.
Thanks, Jesse.
> 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-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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
