[doc] Add a section about RS failover
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Key: HBASE-4456
URL: https://issues.apache.org/jira/browse/HBASE-4456
Project: HBase
Issue Type: Task
Reporter: Jean-Daniel Cryans
The following questions were asked on IRC and I couldn't find a good source of
info in the online book (so I had to answer them, sad I know):
bq. when a region server goes down, 1) do any queries get affected which are
using that region server, if they do what happens to the transactions 2) how
long does it take to switch over to another region server?
Brief answers:
To Q1:
The queries get retried (I'm not sure if we have a chapter that describes how
that works, might be worth adding however bad it currently is).
To Q2:
ZK session timeout + split time + assignment/replay time.
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