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https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020063#comment-14020063
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Jimmy Xiang commented on HBASE-11059:
-------------------------------------
Thanks a lot for the review, Stack!
This one is fixed:
{quote}
Leave of this sentence I'd say: " The other
+ * way around is not recommended also sophisticated users could do it
+ * somehow."
{quote}
For migration instruction, I will copy it to the release note.
This one is fixed:
{quote}
This message will come out wrong?
+ LOG.info("Finished region assignment in (failover=" + failover
+ + ")" + (System.currentTimeMillis() - startTime) + "ms");
{quote}
That's right. It's better to be done in one single transaction explicitly.
Currently, I think we have transactions as long as only one RS is doing the
merge/split for the same set of regions.
{quote}
We have transactions right as long as all in the same region? Which is the case
when only single meta.
{quote}
By the way, I did some test. With a patch v3 (to-be-uploaded), it took about
316 seconds (~5 minutes) to assign 1 million regions. All these regions are
empty so take no time to open. Including loading the regions from meta (twice,
one to restore the state, the other one to init the region assignment snapshot
for favored nodes plan. I think the second one can be removed. I can fix it in
a separate issue), it took about 395 seconds (~6.5 minutes).
Without the patch, I don't have a number yet. It's still running. I have
increased the ZK jute buffer several times.
> ZK-less region assignment
> -------------------------
>
> Key: HBASE-11059
> URL: https://issues.apache.org/jira/browse/HBASE-11059
> Project: HBase
> Issue Type: Improvement
> Components: master, Region Assignment
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Attachments: hbase-11059.patch, hbase-11059_v2.patch, zk-less_am.pdf
>
>
> It seems that most people don't like region assignment with ZK (HBASE-5487),
> which causes many uncertainties. This jira is to support ZK-less region
> assignment. We need to make sure this patch doesn't break backward
> compatibility/rolling upgrade.
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