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Ted Yu commented on HBASE-4497: ------------------------------- Ming's idea @ 28/Sep/11 04:56, especially point 3 is interesting. I like that for long term solution. We need to be careful writing migration code to accommodate the new operation Id. > If region opening fails after updating META HBCK reports it as inconsistent > and scanning the region throws NSRE > --------------------------------------------------------------------------------------------------------------- > > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira