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https://issues.apache.org/jira/browse/HIVE-20168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543294#comment-16543294
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BELUGA BEHR commented on HIVE-20168:
------------------------------------
Actually... don't remove anything... just change the guards to match the
{{MapOperator}} implementation.
Though you should do:
{code}
if (LOG.isTraceEnabled()) {
LOG.info(toString() + ": records written - " + numRows);
}
// ---------------
LOG.info("{} records written - {}", this, numRows);
{code}
> ReduceSinkOperator Logging Hidden
> ---------------------------------
>
> Key: HIVE-20168
> URL: https://issues.apache.org/jira/browse/HIVE-20168
> Project: Hive
> Issue Type: Bug
> Components: Operators
> Affects Versions: 3.0.0, 4.0.0
> Reporter: BELUGA BEHR
> Priority: Minor
> Labels: newbie, noob
>
> [https://github.com/apache/hive/blob/ac6b2a3fb195916e22b2e5f465add2ffbcdc7430/ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java]
>
> {code:java}
> if (LOG.isTraceEnabled()) {
> if (numRows == cntr) {
> cntr = logEveryNRows == 0 ? cntr * 10 : numRows + logEveryNRows;
> if (cntr < 0 || numRows < 0) {
> cntr = 0;
> numRows = 1;
> }
> LOG.info(toString() + ": records written - " + numRows);
> }
> }
> ...
> if (LOG.isTraceEnabled()) {
> LOG.info(toString() + ": records written - " + numRows);
> }
> {code}
> There are logging guards here checking for TRACE level debugging but the
> logging is actually INFO. This is important logging for detecting data skew.
> Please change guards to check for INFO... or I would prefer that the guards
> are removed altogether since it's very rare that a service is running with
> only WARN level logging.
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