FAQ
Provide a mechanism for a client Hadoop configuration to 'poison' daemon startup; i.e., disallow daemon start up on a client config.
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Key: HADOOP-7652
URL: https://issues.apache.org/jira/browse/HADOOP-7652
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Reporter: Philip Zeyliger


We've seen folks who have been given Hadoop configuration to act as a client accidentally type "hadoop namenode" and get things into a confused, or incorrect state. Most recently, we've seen data corruption when users accidentally run extra secondary namenodes (https://issues.apache.org/jira/browse/HDFS-2305).

I'd like to propose that we introduce a configuration property, say, "client.poison.servers", which, if set, disables the Hadoop daemons (nn, snn, jt, tt, etc.) with a reasonable error message. Hadoop administrators can hand out/install configs that are on machines intended to just be clients with a little less worry that they'll accidentally get run.


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postedSep 18, '11 at 6:18p
activeSep 18, '11 at 6:18p
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