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https://issues.apache.org/jira/browse/HADOOP-13986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822093#comment-15822093
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Steve Loughran commented on HADOOP-13986:
-----------------------------------------
really those Gauge.toString() operators should return values; certainly we
could do that for the various int/long gauges and counters. That would ensure
that the evaluation was only if the log statement was needed
> UGI.UgiMetrics.renewalFailureTotal is not printable
> ---------------------------------------------------
>
> Key: HADOOP-13986
> URL: https://issues.apache.org/jira/browse/HADOOP-13986
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.8.0, 3.0.0-alpha2
> Reporter: Wei-Chiu Chuang
> Priority: Minor
>
> The metrics (renewalFailures and renewalFailuresTotal) in the following code
> snippet are not printable.
> {code:title=UserGroupInformation.java}
> metrics.renewalFailuresTotal.incr();
> final long tgtEndTime = tgt.getEndTime().getTime();
> LOG.warn("Exception encountered while running the renewal "
> + "command for {}. (TGT end time:{}, renewalFailures: {},"
> + "renewalFailuresTotal: {})", getUserName(), tgtEndTime,
> metrics.renewalFailures, metrics.renewalFailuresTotal, ie);
> {code}
> The output of the code is like the following:
> {quote}
> 2017-01-12 12:23:14,062 WARN security.UserGroupInformation
> (UserGroupInformation.java:run(1012)) - Exception encountered while running
> the renewal command for [email protected]. (TGT end time:1484252600000,
> renewalFailures:
> org.apache.hadoop.metrics2.lib.MutableGaugeInt@323aa7f9,renewalFailuresTotal:
> org.apache.hadoop.metrics2.lib.MutableGaugeLong@c8af058)
> ExitCodeException exitCode=1: kinit: krb5_cc_get_principal: No credentials
> cache file found
> {quote}
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