[ https://issues.apache.org/jira/browse/HBASE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764777#comment-13764777 ]
Jeffrey Zhong commented on HBASE-9480: -------------------------------------- I reviewed trunk-9480.patch. Since we have outer loop retries, the new retry could trigger NotServingRegionException if the region is closed at the RS or the RS just dies between retries {code}!serverManager.isServerOnline(server){code} would kick in. In addition, we still will have the issue depending on the time when region is closed at the hosting RS. [~jxiang] so you don't want remove the znode deletion part from unassign? Thanks. > 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 > Priority: Blocker > Fix For: 0.96.0 > > Attachments: 9480-1.txt, trunk-9480.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