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https://issues.apache.org/jira/browse/HBASE-2190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833207#action_12833207
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stack commented on HBASE-2190:
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@Kannan In the "commit message" above -- 11/Feb/10 12:15 AM -- I say this:
"Moved housekeeping AFTER pause since when before, its addition of
"processing open" would make it so we didn't sleep and we were
flooding the master with "processing open" messages (this new mechanism
is on a hair-trigger)."
What was happening was if opening a region, in housekeeping, we'd add a
opening-region message to the BlockingQueue -- MSG_REPORT_OPENING_REGION (sor
something like that) -- which in this new hair-trigger setup would immediately
trip a send of the message to the master.... and keep sending messages to the
master until the region successfully opened. We'd never sleep (block on the
queue).
I moved the housekeeping till after we got something from the blockingqueue.
If the region has opened in the meantime, we'll not bother sending
MSG_REPORT_OPENING_REGION. If it hasn't opened, it'll be added and get sent on
the next report to master.
I hope that helps.
> HRS should report to master when HMsg are available
> ---------------------------------------------------
>
> Key: HBASE-2190
> URL: https://issues.apache.org/jira/browse/HBASE-2190
> Project: Hadoop HBase
> Issue Type: Improvement
> Affects Versions: 0.20.3
> Reporter: Jean-Daniel Cryans
> Assignee: stack
> Fix For: 0.20.4, 0.21.0
>
> Attachments: 2190-v2.patch, 2190-v3.patch, 2190-v3.patch,
> HBASE-2190.patch
>
>
> It still takes a lot of time for the client to see splits or just regions
> that move around, with default PE it takes around 4 seconds and creating a
> table takes a bit more than 2 seconds. I remember having the discussion with
> Stack that HRS.run was not suppose to sleep if any message to send.
> Turns out it does sleep.
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