Sandeep Guggilam created HBASE-25130:
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Summary: Masters in-memory serverHoldings map is not cleared
during hbck repair
Key: HBASE-25130
URL: https://issues.apache.org/jira/browse/HBASE-25130
Project: HBase
Issue Type: Bug
Reporter: Sandeep Guggilam
Assignee: Sandeep Guggilam
{color:#1d1c1d}Incase of repairing overlaps, bbck essentially calls the
closeRegion RPC on RS followed by offline RPC on Master to offline all the
overlap regions that would be merged into a new region. {color}
{color:#1d1c1d}However the offline RPC doesn’t remove it from the
serverHoldings map unless the new state is MERGED/SPLIT
(https://github.com/apache/hbase/blob/branch-1/hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionStates.java#L719)
b{color}{color:#1d1c1d}ut the new state in this case is OFFLINE. {color}
{color:#1d1c1d}This is actually intended to match with the META entries and
would be removed later when the region is online on a different server.
However, in our case , the region would never be online on a new server, hence
the region info is never cleared from the map that is used by balancer and SCP
for incorrect reeassignment.{color}
{color:#1d1c1d}We might need to tackle this by removing the entries from the
map when hbck actually deletes{color}{color:#1d1c1d} the meta entries for this
region which kind of matches the in-memory map’s expectation with the META
state.{color}
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