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xiangheng edited comment on HDFS-12943 at 11/12/18 8:07 AM: ------------------------------------------------------------ Thanks [~csun] ,I configured hdfs-site.xml according to the plan document and used the haadmin command: {{haadmin -transitionToObserver,}}But transition from SBN to Observer state failed,And have a {color:#333333}prompt message{color} :{color:#FF0000}transitionToObserver: incorrect arguments{color},Can you tell me the configuration of the observer namenode related in detail?thank you very much. was (Author: xiangheng): Thanks [~csun] ,I configured hdfs-site.xml according to the plan document and used the haadmin command: {{haadmin -transitionToObserver,}}But transition from SBN to Observer state failed,And have a {color:#333333}prompt message{color} :{color:#FF0000}transitionToObserver: incorrect arguments{color},Can you tell me the configuration of the observer namenode related in detail?thank you very much. > Consistent Reads from Standby Node > ---------------------------------- > > Key: HDFS-12943 > URL: https://issues.apache.org/jira/browse/HDFS-12943 > Project: Hadoop HDFS > Issue Type: New Feature > Components: hdfs > Reporter: Konstantin Shvachko > Priority: Major > Attachments: ConsistentReadsFromStandbyNode.pdf, > ConsistentReadsFromStandbyNode.pdf, > TestPlan-ConsistentReadsFromStandbyNode.pdf > > > StandbyNode in HDFS is a replica of the active NameNode. The states of the > NameNodes are coordinated via the journal. It is natural to consider > StandbyNode as a read-only replica. As with any replicated distributed system > the problem of stale reads should be resolved. Our main goal is to provide > reads from standby in a consistent way in order to enable a wide range of > existing applications running on top of HDFS. -- 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