[ https://issues.apache.org/jira/browse/HDFS-12978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16486627#comment-16486627 ]
Yiqun Lin commented on HDFS-12978: ---------------------------------- Hi [~shv], I don't think {{Long.MAX_VALUE}} is a appropriate value for {{DFS_HA_TAILEDITS_MAX_TXNS_PER_LOCK_DEFAULT}}, that means we should display this so long number in hdfs-default.xml file. Maybe we can just use -1 instead, that means we don't do any limitation for consuming transactions. > Fine-grained locking while consuming journal stream. > ---------------------------------------------------- > > Key: HDFS-12978 > URL: https://issues.apache.org/jira/browse/HDFS-12978 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: namenode > Reporter: Konstantin Shvachko > Assignee: Konstantin Shvachko > Priority: Major > Attachments: HDFS-12978.001.patch > > > In current implementation SBN consumes the entire segment of transactions > under a single namesystem lock, which does not allow reads over a long period > of time until the segment is processed. We should break the lock into fine > grained chunks. In extreme case each transaction should release the lock once > it is applied. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org