MapR 5.1 is at End of Life (EOL) and no longer supported. Please see the latest documentation. This documentation is not being updated.

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5.1 Administration
This section contains administration information such as managing your cluster, data, users, jobs and security information such as configuring your security environment and auditing.
Administrator Guide
Managing the Cluster
Managing Roles and Services
TaskTracker Blacklisting
Un-blacklisting a TaskTracker Manually

Un-blacklisting a TaskTracker Manually

Procedure

If a TaskTracker is blacklisted per job, you can un-blacklist it by running the following command as the administrative user:
```
hadoop job -unblacklist <jobid> <hostname> 
```
If a TaskTracker has been blacklisted cluster-wide due to mapred.max.tracker.blacklists or using the hadoop job -blacklist-tracker <host> command, use the following command as the administrative user to remove that node from the blacklist:
```
hadoop job -unblacklist-tracker <hostname>
```
If a TaskTracker has been blacklisted cluster-wide due to a non-healthy status, correct the indicated problem and run the health check script again. When the script picks up the healthy status, the TaskTracker is un-blacklisted.