ramkrishna.s.vasudevan created HBASE-5875:
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Summary: Process RIT and Master restart may remove an online
server considering it as a dead server
Key: HBASE-5875
URL: https://issues.apache.org/jira/browse/HBASE-5875
Project: HBase
Issue Type: Bug
Affects Versions: 0.92.1
Reporter: ramkrishna.s.vasudevan
Fix For: 0.94.0
If on master restart it finds the ROOT/META to be in RIT state, master tries to
assign the ROOT region through ProcessRIT.
Master will trigger the assignment and next will try to verify the Root Region
Location.
Root region location verification is done seeing if the RS has the region in
its online list.
If the master triggered assignment has not yet been completed in RS then the
verify root region location will fail.
Because it failed
{code}
splitLogAndExpireIfOnline(currentRootServer);
{code}
we do split log and also remove the server from online server list. Ideally
here there is nothing to do in splitlog as no region server was restarted.
So master, though the server is online, master just invalidates the region
server.
In a special case, if i have only one RS then my cluster will become non
operative.
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