aljoscha commented on a change in pull request #10891:
[FLINK-15561][Security][hotfix] Add Delegation Token checker in
YarnClusterDescriptor
URL: https://github.com/apache/flink/pull/10891#discussion_r376280166
##########
File path:
flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/util/HadoopUtils.java
##########
@@ -112,6 +112,27 @@ public static Configuration
getHadoopConfiguration(org.apache.flink.configuratio
return result;
}
+ public static boolean isCredentialsConfigured(boolean useTicketCache)
throws Exception {
+ UserGroupInformation loginUser =
UserGroupInformation.getCurrentUser();
+ if (UserGroupInformation.isSecurityEnabled()) {
+ // note: UGI::hasKerberosCredentials inaccurately
reports false
+ // for logins based on a keytab (fixed in Hadoop 2.6.1,
see HADOOP-10786),
+ // so we check only in ticket cache scenario.
+ if (useTicketCache &&
!loginUser.hasKerberosCredentials()) {
+ // a delegation token is an adequate substitute
in most cases
+ if (!HadoopUtils.hasHDFSDelegationToken()) {
+ LOG.warn("Hadoop security is enabled
but current login user does not have Kerberos credentials, " +
Review comment:
Are the two branches in the wrong order here?
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