[GitHub] [accumulo] keith-turner opened a new issue #1086: ZooLock uses ZooReader which may retry on session expired

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keith-turner opened a new issue #1086: ZooLock uses ZooReader which may retry on session expired
URL: https://github.com/apache/accumulo/issues/1086
 
 
   Accumulo tablet servers use ephemeral nodes in zookeeper to advertise their existence. If this ephemeral node is deleted for any reason a tablet server must halt.   One way it can be deleted is if  a tablet server is not responsive enough to zookeeper servers.  In this case the zookeeper servers will close the session which causes any ephemeral nodes related to the session to be deleted.  If the tablet server is still alive and tries to communicate with zookeeper it will get a session expired exception.  When this happens the tablet server should halt.
   
   The code that manages tablet servers ephemeral nodes is called ZookLock.  ZooLock uses an Accumulo abstraction  for Zookeeper called ZooReader.  The ZooReader code may retry on session expired events.  Need to examine ZooLock's use of ZooReader to ensure that retrying on session expired events does not delay ZooLock from becoming aware of session expiration.

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