@VisibleForTesting
org.apache.hadoop.security.token.Token<TimelineDelegationTokenIdentifier>
getTimelineDelegationToken() throws IOException, YarnException {
try {
return timelineClient.getDelegationToken(timelineDTRenewer);
} catch (Exception e) {
if (timelineServiceBestEffort) {
LOG.warn("Failed to get delegation token from the timeline server: " + e.getMessage());
return null;
}
throw e;
}
}
