Change in LB.randomAssignment(List<ServerName> servers) API
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Key: HBASE-5510
URL: https://issues.apache.org/jira/browse/HBASE-5510
Project: HBase
Issue Type: Improvement
Affects Versions: 0.92.0
Reporter: Anoop Sam John
In LB there is randomAssignment(List<ServerName servers>) API which will be
used by AM to assign
a region from a down RS. [This will be also used in other cases like call to
assign() API from client]
I feel it would be better to pass the HRegionInfo also into this method. When
the LB making a choice for a region
assignment, when one RS is down, it would be nice that the LB knows for which
region it is doing this server selection.
+Scenario+
While one RS down, we wanted the regions to get moved to other RSs but a set
of regions stay together. We are having custom load balancer but with the
current way of LB interface this is not possible. Another way is I can allow a
random assignment of the regions at the RS down time. Later with a cluster
balance I can balance the regions as I need. But this might make regions assign
1st to one RS and then again move to another. Also for some time period my
business use case can not get satisfied.
Also I have seen some issue in JIRA which speaks about making sure that Root
and META regions always sit in some specific RSs. With the current LB API this
wont be possible in future.
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