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HBASE-27025 Change Hbase book's description for 74.7.3. Load Balancing META table load (#4530) 

Signed-off-by: Bryan Beaudreault <bbeaudreault@apache.org>
Signed-off-by: Duo Zhang <zhangduo@apache.org>
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huaxiangsun 2022-06-24 08:01:24 -07:00 committed by GitHub
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@ -2955,7 +2955,10 @@ client-side, clients will try to read META replicas first before falling back on
the primary. Before this, the replica lookup mode -- now named `HedgedRead` in
hbase-2.4.0 -- had clients read the primary and if no response after a
configurable amount of time had elapsed, it would start up reads against the
replicas.
replicas. Starting from hbase-2.4.12(and all higher minor versions), with
client-side `LoadBalance` mode, clients load balance META scan requests across
all META replica regions, including the primary META region. In case of exceptions
such as NotServingRegionException, it will fall back on the primary META region.
The new 'LoadBalance' mode helps alleviate hotspotting on the META
table distributing META read load.