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Chen Liang commented on HDFS-13873: ----------------------------------- Update here for reference: Synced offline with Konstantin. Seems one fundamental issue with my previous proposed approaches is that, when the server state id increment is slow, it is hard to differentiate between: 1. the server is slow; 2. there were not many write anyway. Meaning, in addition to estimating request syncing time, we also need to have a reasonable estimate of server state catch up rate, instead purely based current window. > ObserverNode should reject read requests when it is too far behind. > ------------------------------------------------------------------- > > Key: HDFS-13873 > URL: https://issues.apache.org/jira/browse/HDFS-13873 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: hdfs-client, namenode > Affects Versions: HDFS-12943 > Reporter: Konstantin Shvachko > Assignee: Chao Sun > Priority: Major > > Add a server-side threshold for ObserverNode to reject read requests when it > is too far behind. -- 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