09-07-2017 10:39 AM
A seemingly simple question, to which I can't find a clear answer.
Which services/node-types must be restarted for each of the configuration properties? For example, if I update the 'dfs.datanode.handler.count' property in the `hdfs-site.xml` configuration file, which services must be restarted? Can I get away with only restarting `datanodes`, or do I also need to restart `journalnodes` and/or `namenodes`, `zkfc` etc.
Just looking for clarification on this issue, though it seems that generally the advice is "restart everything"?
09-16-2017 12:31 AM - edited 09-16-2017 12:33 AM
since hdfs-site xml contains information / setting about hdfs daemons it is always good to restart namenode datanode and secondaryname.
In you case since you are only chaning the dfs.datanode.handler.count which at the datanode level you can just restart datanode alone . Hope this is suffice .