No worker selections strategy set. Using default.

Im seeing this error message in overlord console and not sure if it’s something I should be concerned about: “No worker selections strategy set. Using default.”

2016-11-07T15:12:00,998 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

805.766: [GC (Allocation Failure) 805.766: [ParNew: 229745K->25600K(230400K), 0.4006025 secs] 1019726K->935482K(2071552K), 0.4008191 secs] [Times: user=5.48 sys=0.05, real=0.40 secs]

806.484: [CMS-concurrent-sweep: 2.214/2.628 secs] [Times: user=11.48 sys=0.33, real=2.62 secs]

806.485: [CMS-concurrent-reset-start]

806.496: [CMS-concurrent-reset: 0.011/0.011 secs] [Times: user=0.10 sys=0.00, real=0.01 secs]

807.235: [GC (Allocation Failure) 807.235: [ParNew: 230400K->25600K(230400K), 0.4138589 secs] 968859K->901066K(2071552K), 0.4140754 secs] [Times: user=5.65 sys=0.02, real=0.42 secs]

2016-11-07T15:12:20,689 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

836.793: [GC (Allocation Failure) 836.793: [ParNew: 230400K->25600K(230400K), 0.2066828 secs] 1105866K->961678K(2071552K), 0.2069105 secs] [Times: user=1.73 sys=0.16, real=0.21 secs]

848.742: [GC (Allocation Failure) 848.742: [ParNew: 230400K->25600K(230400K), 0.2444816 secs] 1166478K->1040188K(2071552K), 0.2447393 secs] [Times: user=2.74 sys=0.11, real=0.24 secs]

856.444: [GC (Allocation Failure) 856.444: [ParNew: 230400K->25600K(230400K), 0.4097911 secs] 1244988K->1172663K(2071552K), 0.4100306 secs] [Times: user=5.33 sys=0.17, real=0.41 secs]

864.126: [GC (Allocation Failure) 864.126: [ParNew: 230400K->25600K(230400K), 0.3994982 secs] 1377463K->1304458K(2071552K), 0.3997196 secs] [Times: user=5.29 sys=0.16, real=0.40 secs]

871.800: [GC (Allocation Failure) 871.800: [ParNew: 230400K->25600K(230400K), 0.4150746 secs] 1509258K->1435199K(2071552K), 0.4153006 secs] [Times: user=5.33 sys=0.08, real=0.41 secs]

2016-11-07T15:13:09,974 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

2016-11-07T15:13:29,547 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

904.297: [GC (Allocation Failure) 904.297: [ParNew: 230400K->25600K(230400K), 0.1637766 secs] 1639999K->1481769K(2071552K), 0.1640020 secs] [Times: user=1.93 sys=0.08, real=0.16 secs]

909.922: [GC (Allocation Failure) 909.922: [ParNew: 229847K->25600K(230400K), 0.3319192 secs] 1686016K->1584690K(2071552K), 0.3321546 secs] [Times: user=4.21 sys=0.08, real=0.33 secs]

910.255: [GC (CMS Initial Mark) [1 CMS-initial-mark: 1559090K(1841152K)] 1588106K(2071552K), 0.0122978 secs] [Times: user=0.16 sys=0.00, real=0.01 secs]

910.268: [CMS-concurrent-mark-start]

910.646: [CMS-concurrent-mark: 0.378/0.378 secs] [Times: user=2.55 sys=0.09, real=0.37 secs]

910.646: [CMS-concurrent-preclean-start]

910.652: [CMS-concurrent-preclean: 0.006/0.006 secs] [Times: user=0.02 sys=0.00, real=0.01 secs]

910.652: [CMS-concurrent-abortable-preclean-start]

CMS: abort preclean due to time 915.806: [CMS-concurrent-abortable-preclean: 4.552/5.154 secs] [Times: user=10.78 sys=0.03, real=5.15 secs]

915.808: [GC (CMS Final Remark) [YG occupancy: 193837 K (230400 K)]915.808: [Rescan (parallel) , 0.0859287 secs]915.894: [weak refs processing, 0.0000778 secs]915.894: [class unloading, 0.0304456 secs]915.925: [scrub symbol table, 0.0129188 secs]915.938: [scrub string table, 0.0019844 secs][1 CMS-remark: 1559090K(1841152K)] 1752927K(2071552K), 0.1328209 secs] [Times: user=1.12 sys=0.03, real=0.14 secs]

915.941: [CMS-concurrent-sweep-start]

917.147: [GC (Allocation Failure) 917.147: [ParNew: 230400K->25600K(230400K), 0.3044367 secs] 1187271K->1090825K(2071552K), 0.3046537 secs] [Times: user=3.52 sys=0.08, real=0.31 secs]

918.227: [CMS-concurrent-sweep: 1.980/2.286 secs] [Times: user=7.40 sys=0.18, real=2.28 secs]

918.228: [CMS-concurrent-reset-start]

918.237: [CMS-concurrent-reset: 0.010/0.010 secs] [Times: user=0.02 sys=0.00, real=0.02 secs]

924.719: [GC (Allocation Failure) 924.719: [ParNew: 230400K->25600K(230400K), 0.3491760 secs] 930119K->855663K(2071552K), 0.3493974 secs] [Times: user=4.16 sys=0.11, real=0.35 secs]

925.849: [GC (Allocation Failure) 925.849: [ParNew: 230400K->25600K(230400K), 0.3071089 secs] 1060463K->964570K(2071552K), 0.3073290 secs] [Times: user=3.51 sys=0.11, real=0.31 secs]

928.421: [GC (Allocation Failure) 928.422: [ParNew: 230400K->25600K(230400K), 0.4298008 secs] 1169370K->1123232K(2071552K), 0.4300284 secs] [Times: user=4.53 sys=0.24, real=0.43 secs]

2016-11-07T15:14:08,214 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

950.189: [GC (Allocation Failure) 950.189: [ParNew: 230400K->25600K(230400K), 0.2476358 secs] 1328032K->1198478K(2071552K), 0.2478575 secs] [Times: user=2.67 sys=0.20, real=0.25 secs]

2016-11-07T15:14:28,113 WARN [rtr-pending-tasks-runner-0] io.druid.indexing.overlord.RemoteTaskRunner - No worker selections strategy set. Using default.

Hi JC, this isn’t really an issue. You can optionally configure different task distribution strategies for workers: http://druid.io/docs/0.9.1.1/configuration/indexing-service.html