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https://issues.apache.org/jira/browse/HBASE-25032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196506#comment-17196506
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Sandeep Guggilam commented on HBASE-25032:
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FYI [~apurtell]
> Wait for region server to become online before considering it online in Master
> ------------------------------------------------------------------------------
>
> Key: HBASE-25032
> URL: https://issues.apache.org/jira/browse/HBASE-25032
> Project: HBase
> Issue Type: Bug
> Reporter: Sandeep Guggilam
> Assignee: Sandeep Guggilam
> Priority: Major
>
> As part of RS start up, RS reports for duty to Master . Master acknowledges
> the request and adds it to the onlineServers list for further assigning any
> regions to the RS
> Once Master acknowledges the reportForDuty and sends back the response, RS
> does a bunch of stuff like initializing replication sources etc before
> becoming online. However, sometimes there could be an issue with initializing
> replication sources when it is unable to connect to peer clusters because of
> some kerberos configuration and there would be a delay of around 20 mins in
> becoming online.
>
> Since master considers it online, it tries to assign regions and which fails
> with ServerNotRunningYet exception, then the master tries to unassign which
> again fails with the same exception leading the region to FAILED_CLOSE state.
>
> It would be good to have a check to see if the RS is ready to accept the
> assignment requests before adding it to online servers list which would
> account for any such delays as described above
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