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https://issues.apache.org/jira/browse/HADOOP-16958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ctest updated HADOOP-16958:
---------------------------
Flags: Patch
> NullPointerException(NPE) when hadoop.security.authorization is enabled but
> the input PolicyProvider for ZKFCRpcServer is NULL
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-16958
> URL: https://issues.apache.org/jira/browse/HADOOP-16958
> Project: Hadoop Common
> Issue Type: Bug
> Components: common, ha
> Affects Versions: 3.2.1
> Reporter: Ctest
> Priority: Critical
> Attachments: HADOOP-16958.000.patch
>
>
> During initialization, ZKFCRpcServer refreshes the service authorization ACL
> for the service handled by this server if config
> hadoop.security.authorization is enabled, by calling refreshServiceAcl with
> the input PolicyProvider and Configuration.
> {code:java}
> ZKFCRpcServer(Configuration conf,
> InetSocketAddress bindAddr,
> ZKFailoverController zkfc,
> PolicyProvider policy) throws IOException {
> this.server = ...
>
> // set service-level authorization security policy
> if (conf.getBoolean(
> CommonConfigurationKeys.HADOOP_SECURITY_AUTHORIZATION, false)) {
> server.refreshServiceAcl(conf, policy);
> }
> }{code}
> refreshServiceAcl calls
> ServiceAuthorizationManager#refreshWithLoadedConfiguration which directly
> gets services from the provider with provider.getServices(). When the
> provider is NULL, the code throws NPE without an informative message. In
> addition, the default value of config
> `hadoop.security.authorization.policyprovider` (which controls PolicyProvider
> here) is NULL and the only usage of ZKFCRpcServer initializer provides only
> an abstract method getPolicyProvider which does not enforce that
> PolicyProvider should not be NULL.
> The suggestion here is to either add a guard check or exception handling with
> an informative logging message on ZKFCRpcServer to handle input
> PolicyProvider being NULL.
>
> I am very happy to provide a patch for it if the issue is confirmed :)
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