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stack commented on HBASE-9480: ------------------------------ [~jeffreyz] Agreed. There are too many corner cases and then there is amount of resources consumed getting this whole rube goldberg machine working reliably. There are scaling issues too (see the flurry talk at the last hbase meetup). We should have a chat about it -- post 0.96.0 rollout? There are a few ideas floating about. Should come up with a strawman at least while the pain is fresh in our minds. (Cc'ing [~fenghh] since he expressed interest in this area too as is [~jxiang] of course) > Regions are unexpectedly made offline in certain failure conditions > ------------------------------------------------------------------- > > Key: HBASE-9480 > URL: https://issues.apache.org/jira/browse/HBASE-9480 > Project: HBase > Issue Type: Bug > Reporter: Devaraj Das > Assignee: Jimmy Xiang > Fix For: 0.96.0 > > Attachments: 9480-1.txt, trunk-9480.patch, trunk-9480_v1.1.patch, > trunk-9480_v1.2.patch, trunk-9480_v2.patch > > > Came across this issue (HBASE-9338 test): > 1. Client issues a request to move a region from ServerA to ServerB > 2. ServerA is compacting that region and doesn't close region immediately. In > fact, it takes a while to complete the request. > 3. The master in the meantime, sends another close request. > 4. ServerA sends it a NotServingRegionException > 5. Master handles the exception, deletes the znode, and invokes regionOffline > for the said region. > 6. ServerA fails to operate on ZK in the CloseRegionHandler since the node is > deleted. > The region is permanently offline. > There are potentially other situations where when a RegionServer is offline > and the client asks for a region move off from that server, the master makes > the region offline. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira