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ASF GitHub Bot commented on FLINK-3929: --------------------------------------- Github user smarthi commented on a diff in the pull request: https://github.com/apache/flink/pull/2275#discussion_r72472262 --- Diff: flink-core/src/main/java/org/apache/flink/util/Preconditions.java --- @@ -293,6 +293,16 @@ private static String format(@Nullable String template, @Nullable Object... args return builder.toString(); } + + /** + * Returns {@code true} if the given string is null or is the empty string. + * @param string a string reference to check + * @return {@code true} if the string is null or is the empty string + */ + public static boolean isNullOrEmpty(@Nullable String string) { --- End diff -- Consider using Apache Commons StringUtils.isBlank() for this. > Support for Kerberos Authentication with Keytab Credential > ---------------------------------------------------------- > > Key: FLINK-3929 > URL: https://issues.apache.org/jira/browse/FLINK-3929 > Project: Flink > Issue Type: New Feature > Reporter: Eron Wright > Assignee: Vijay Srinivasaraghavan > Labels: kerberos, security > Original Estimate: 672h > Remaining Estimate: 672h > > _This issue is part of a series of improvements detailed in the [Secure Data > Access|https://docs.google.com/document/d/1-GQB6uVOyoaXGwtqwqLV8BHDxWiMO2WnVzBoJ8oPaAs/edit?usp=sharing] > design doc._ > Add support for a keytab credential to be associated with the Flink cluster, > to facilitate: > - Kerberos-authenticated data access for connectors > - Kerberos-authenticated ZooKeeper access > Support both the standalone and YARN deployment modes. > -- This message was sent by Atlassian JIRA (v6.3.4#6332)