672c440b9f
Added new bulk assign createRoundRobinAssignProcedure to complement the existing createAssignProcedure. The former asks the balancer for target servers to set into the created AssignProcedures. The latter sets no target server into AssignProcedure. When no target server is specified, we make effort at assign-time at trying to deploy the region to its old location if there was one. The new round robin assign procedure creator does not do this. Use the new round robin method on table create or reenabling offline regions. Use the old assign in ServerCrashProcedure or in EnableTable so there is a chance we retain locality. Bulk preassigning passing all to-be-assigned to the balancer in one go is good for ensuring good distribution especially when read replicas in the mix. The old assign was single-assign scoped so region replicas could end up on the same server. M hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignProcedure.java Cleanup around forceNewPlan. Was confusing. Added a Comparator to sort AssignProcedures so meta and system tables come ahead of user-space tables. M hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java Remove the forceNewPlan argument on createAssignProcedure. Didn't make sense given we were creating a new AssignProcedure; the arg had no effect. (createRoundRobinAssignProcedures) Recast to feed all regions to the balancer in bulk and to sort the return so meta and system tables take precedence. Miscellaneous fixes including keeping the Master around until all RegionServers are down, documentation on how assignment retention works, etc. |
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