Automatic configuration refresh

The Automatic configuration refresh feature is supported in gpfs.hdfs-protocol 2.7.0-2 and later.

After making configuration changes in /usr/lpp/mmfs/hadoop/etc/hadoop (for HDFS Transparency 2.7.3-x) or /var/mmfs/hadoop/etc/hadoop (for HDFS Transparency 3.0.0) or in the IBM Storage Scale file system, such as maximum number of replica and NSD server, run the following command to refresh HDFS transparency without restarting the HDFS transparency services:

/usr/lpp/mmfs/hadoop/bin/gpfs dfsadmin -refresh
<namenode_hostname>:<port> refreshGPFSConfig

Run the command on any HDFS transparency node and change <namenode_hostname>:<port> according to the HDFS transparency configuration. For example, if fs.defaultFS is hdfs://c8f2n03.gpfs.net:8020 in /usr/lpp/mmfs/hadoop/etc/hadoop/core-site.xml, replace <namenode_hostname> with c8f2n03.gpfs.net and <port> with 8020. HDFS transparency synchronizes the configuration changes with the HDFS transparency services running on the HDFS transparency nodes and makes it immediately effective.