ZanderXu opened a new pull request, #4497: URL: https://github.com/apache/hadoop/pull/4497
### Description of PR In our prod environment, 8020 Handler of Observer NameNode also blocked by EditlogTailer. And EditlogTailer cost a long time for selecting InputStreams from Journalnode with holding the FSNLock. During this period, 8020 handlers of Observer NameNode will be blocked by the FSN Lock. In theory, selecting inputstreams from JournalNode does not involve changing memory information in NameNode, so we can move the selecting out of the FSN Lock, and it can improve the throughput of Observer NameNode. After reading the relevant code in depth, I found that it is feasible to move the selecting inputStream out of the FSNLock. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
