Database Reference
In-Depth Information
Summary table shows the number of blacklisted nodes in the cluster. The ex-
cluded nodes show the number of decommissioned nodes in the cluster.
The following screenshot shows the Cluster Summary section of the jobtracker
web interface:
Scheduling Information : This section shows the job scheduler information for
the cluster. Here, the default job scheduler is a hyperlink that can be clicked to see
the information of the jobs that are currently in queue. The default scheduler
maintains a queue of all the jobs submitted and completes jobs sequentially. There
are other types of the schedulers too that can be configured to run jobs in Hadoop,
such as fair scheduler and capacity scheduler.
The following screenshot shows the Scheduling Information section of the job-
tracker web interface:
Running Jobs : This section shows the details of the current running jobs in the
cluster. This is very useful to monitor the status of the jobs. The Jobid column
lists all the job IDs and each of them are hyperlinks. Clicking on one will bring up
more details of the job. Some other basic job-related information such as the job
priority, the user who submitted the job, and the name of the job are also dis-
played. The progress of the cumulative map and reduce tasks are also shown as
percentages. Total map tasks, completed map tasks, total reduce tasks, and com-
pleted reduce task are also displayed.
Search WWH ::




Custom Search