If region opening fails after updating META HBCK reports it as inconsistent and
scanning the region throws NSRE
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Key: HBASE-4497
URL: https://issues.apache.org/jira/browse/HBASE-4497
Project: HBase
Issue Type: Bug
Reporter: ramkrishna.s.vasudevan
Priority: Critical
As per the discussion in the mail chain "HBCK reporting of possible mismatch in
RS assignment" this JIRA is created.
Consider two RS-> RS1 and RS2.
A region tries to open in RS1. But it takes a while. The RS1 has still not
updated meta and transitioned the node from OPENING to OPENED
So timeout assigns the region to RS2. RS2 successfully updates the META and
opens the region.
Now RS1 tries to act on the region by first updating the META and then
transiting the node to OPENING to OPENED.
RS1 transiting the node to OPENING to OPENED will fail. But the META entry
will have RS1 as the latest.
Now HBCK reports this as an inconsistency and if we try to scan the Region we
get NotServingRegionException.
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