[ https://issues.apache.org/jira/browse/HDFS-13594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lisheng Sun reassigned HDFS-13594: ---------------------------------- Assignee: Lisheng Sun > the lock of ShortCircuitCache is hold while close the ShortCircuitReplica > --------------------------------------------------------------------------- > > Key: HDFS-13594 > URL: https://issues.apache.org/jira/browse/HDFS-13594 > Project: Hadoop HDFS > Issue Type: Improvement > Components: hdfs-client > Affects Versions: 3.0.2 > Reporter: Gang Xie > Assignee: Lisheng Sun > Priority: Minor > Attachments: no_hdfs.svg > > > When we are profiling SC read, we find that ShortCircuitCache's lock is a hot > spot. After look into the code, we find that when close BlockReaderLocal, it > tries to trimEvictionMaps, and several ShortCircuitReplicas are closed while > the lock being hold. This slows down the close of the BlockReaderLocal, and > the worse is that it blocks the other allocating of the new > ShortCircuitReplicas. > An idea to avoid this is to close the replica in an async way. I will do a > prototype and get the performance. -- This message was sent by Atlassian JIRA (v7.6.14#76016) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org