[ https://issues.apache.org/jira/browse/YARN-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp updated YARN-503: ----------------------------- Attachment: YARN-503.patch Fixed findbugs issues. Upon review of those issues, I realized I was trying too hard to prevent tight & unlikely race conditions. I simplified the design further which allowed for the removal of virtually all the synchronization which could lead to tricky deadlocks. Updated tests to ensure apps and/or tokens don't leak. > DelegationTokens will be renewed forever if multiple jobs share tokens and > the first one sets JOB_CANCEL_DELEGATION_TOKEN to false > ---------------------------------------------------------------------------------------------------------------------------------- > > Key: YARN-503 > URL: https://issues.apache.org/jira/browse/YARN-503 > Project: Hadoop YARN > Issue Type: Bug > Components: resourcemanager > Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha > Reporter: Siddharth Seth > Assignee: Daryn Sharp > Attachments: YARN-503.patch, YARN-503.patch > > > The first Job/App to register a token is the one which DelegationTokenRenewer > associates with a a specific Token. An attempt to remove/cancel these shared > tokens by subsequent jobs doesn't work - since the JobId will not match. > As a result, Even if subsequent jobs have > MRJobConfig.JOB_CANCEL_DELEGATION_TOKEN set to true - tokens will not be > cancelled when those jobs complete. > Tokens will eventually be removed from the RM / JT when the service that > issued them considers them to have expired or via an explicit > cancelDelegationTokens call (not implemented yet in 23). > A side affect of this is that the same delegation token will end up being > renewed multiple times (a separate TimerTask for each job which uses the > token). > DelegationTokenRenewer could maintain a reference count/list of jobIds for > shared tokens. -- 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