[ https://issues.apache.org/jira/browse/KUDU-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mostafa Mokhtar updated KUDU-2355: ---------------------------------- Summary: Uneven assignment of work across Maintenance Mgr threads (was: Uneven assignment of work across ) > Uneven assignment of work across Maintenance Mgr threads > -------------------------------------------------------- > > Key: KUDU-2355 > URL: https://issues.apache.org/jira/browse/KUDU-2355 > Project: Kudu > Issue Type: Bug > Affects Versions: 1.8.0 > Reporter: Mostafa Mokhtar > Priority: Major > > While running inserts into a Kudu table I noticed that there is an uneven > assignment of work across maintenance threads, this reduces scalability of > the maintenance as more threads won't always mean better throughput. > |Thread name|| Cumulative User CPU(s)|| Cumulative Kernel > CPU(s) ||Cumulative IO-wait(s)| > |MaintenanceMgr [worker]-59102| 3410.94| 352.07| 866.71| > |MaintenanceMgr [worker]-59101| 3056.77| 319.32| 794.1| > |MaintenanceMgr [worker]-59100| 2924.29| 300.35| 831.66| > |MaintenanceMgr [worker]-59099| 3021.22| 307.3| 783.84| > |MaintenanceMgr [worker]-59098| 2174.47| 216.55| 716| > |MaintenanceMgr [worker]-59097| 3240.47| 335.55| 846.99| > |MaintenanceMgr [worker]-59096| 2206.57| 218.63| 752.62| > |MaintenanceMgr [worker]-59095| 2112.76| 210.93| 720.67| > Snapshot from top > {code} > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 59102 kudu 20 0 25.3g 15g 11m R 105.0 6.1 64:42.20 MaintenanceMgr > 59097 kudu 20 0 25.3g 15g 11m R 101.7 6.1 61:15.90 MaintenanceMgr > 59096 kudu 20 0 25.3g 15g 11m R 98.4 6.1 42:12.19 MaintenanceMgr > 59098 kudu 20 0 25.3g 15g 11m R 98.4 6.1 41:53.22 MaintenanceMgr > 59100 kudu 20 0 25.3g 15g 11m D 36.1 6.1 55:49.99 MaintenanceMgr > 59095 kudu 20 0 25.3g 15g 11m D 29.5 6.1 40:34.79 MaintenanceMgr > 59099 kudu 20 0 25.3g 15g 11m D 0.0 6.1 57:28.81 MaintenanceMgr > 59101 kudu 20 0 25.3g 15g 11m D 0.0 6.1 58:03.63 MaintenanceMgr > {code} > This was found using > kudu 1.8.0-SNAPSHOT (rev e70c5ee0d6d598ba53d002ebfc7f81bb2ceda404) > server uuid bd4cc6fdd79d4ebc8a4def27004b011d -- This message was sent by Atlassian JIRA (v7.6.3#76005)