Ajay Kumar created HADOOP-14969:
-----------------------------------
Summary: Improve diagnostics in secure DataNode startup
Key: HADOOP-14969
URL: https://issues.apache.org/jira/browse/HADOOP-14969
Project: Hadoop Common
Issue Type: Improvement
Reporter: Ajay Kumar
Assignee: Ajay Kumar
When DN secure mode configuration is incorrect, it throws the following
exception from Datanode#checkSecureConfig
{code}
private static void checkSecureConfig(DNConf dnConf, Configuration conf,
SecureResources resources) throws RuntimeException {
if (!UserGroupInformation.isSecurityEnabled()) {
return;
}
...
throw new RuntimeException("Cannot start secure DataNode without " +
"configuring either privileged resources or SASL RPC data transfer " +
"protection and SSL for HTTP. Using privileged resources in " +
"combination with SASL RPC data transfer protection is not supported.");
{code}
The DN should print more useful diagnostics as to what exactly what went wrong.
Also when starting secure DN with resources then the startup scripts should
launch the SecureDataNodeStarter class. If no SASL is configured and
SecureDataNodeStarter is not used, then we could mention that too.
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