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ASF GitHub Bot logged work on HDFS-16642: ----------------------------------------- Author: ASF GitHub Bot Created on: 29/Jun/22 23:19 Start Date: 29/Jun/22 23:19 Worklog Time Spent: 10m Work Description: jojochuang commented on PR #4497: URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1170586655 Looks thread-safe to me. Has this patch been tested in a production environment? Issue Time Tracking ------------------- Worklog Id: (was: 786215) Time Spent: 0.5h (was: 20m) > [SBN read] Moving selecting inputstream from JN in EditlogTailer out of > FSNLock > ------------------------------------------------------------------------------- > > Key: HDFS-16642 > URL: https://issues.apache.org/jira/browse/HDFS-16642 > Project: Hadoop HDFS > Issue Type: Improvement > Reporter: ZanderXu > Assignee: ZanderXu > Priority: Major > Labels: pull-request-available > Time Spent: 0.5h > Remaining Estimate: 0h > > EditlogTailer cost a long time for selecting InputStreams from Journalnode > while holding the write lock of 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. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org