JobTracker Configuration
Changing any parameters in this section requires a JobTracker restart.
Parameter |
Description |
---|---|
mapreduce.job.counters.counter.name.max |
Limit on the length of counter names in jobs. Names exceeding this limit will be truncated. Default value: |
mapreduce.job.counters.group.name.max |
Limit on the length of counter group names in jobs. Names exceeding this limit will be truncated. Default value: |
mapred.job.tracker |
JobTracker address ip:port or use uri Default value: |
mapred.jobtracker.port |
Port on which JobTracker listens. Read by JobTracker to start RPC Server. Default value: |
mapred.jobtracker.ui.showcounters |
Enables the CPU/memory counters for active jobs on the JobTracker node. Set the
value to Default value: |
mapreduce.tasktracker.outofband.heartbeat |
The task tracker sends an out-of-band heartbeat on task completion to improve latency. Set this value to false to disable this behavior. Default value: |
webinterface.private.actions |
By default, jobs cannot be killed from the JobTracker's web interface. Set this value to True to enable this behavior. WARNING:
MapR recommends properly securing your interfaces before enabling this behavior. Default value: |
maprfs.openfid2.prefetch.bytes |
Expert: number of shuffle bytes to be prefetched by reduce task Default value: |
mapr.localoutput.dir |
The path for map output files on shuffle volume. Default value: |
mapr.localspill.dir |
The path for local spill files on shuffle volume. Default value: |
mapreduce.jobtracker.node.labels.file |
The file that specifies the labels to apply to the nodes in the cluster. |
mapreduce.jobtracker.node.labels.monitor.interval |
Specifies a time interval in milliseconds. The node labels file is polled for changes every time this interval passes. Default value: 120000 |
mapred.queue.<queue-name>.label |
Specifies a label for the queue named in the
|
mapred.queue.<queue-name>.label.policy |
Specifies a policy for the label applied to the queue named in the
|
ipc.server.noncurrent.version.allowed |
When set to true, this parameter allows IPC version mismatches. Set this parameter to false to prevent JobClient or TaskTracker code from releases prior to version 3.1 of the MapR software from running with a 3.1 JobTracker. Default value: |