[ https://issues.apache.org/jira/browse/HADOOP-14032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Akira Ajisaka updated HADOOP-14032: ----------------------------------- Fix Version/s: 2.9.0 > Reduce fair call queue priority inversion > ----------------------------------------- > > Key: HADOOP-14032 > URL: https://issues.apache.org/jira/browse/HADOOP-14032 > Project: Hadoop Common > Issue Type: Sub-task > Components: ipc > Affects Versions: 2.7.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Fix For: 2.9.0, 2.8.1, 3.0.0-alpha4 > > Attachments: HADOOP-14032.patch > > > The fcq's round robin multiplexer actually rewards abusive users. Queue > consumers scan for a call from the roving multiplexer index to the lowest > prio ring before wrapping around to the higher prio rings. > Let's take a fcq with 4 priority rings. Multiplexer shares per index are 8, > 4, 2, 1. > All well behaved clients are operating in ring 0. Bad client floods the > server and drops to the lowest prio. Unfortunately the service order gives 8 > shares to the good clients, followed by 4+2+1=7 shares to the bad client. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org