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https://issues.apache.org/jira/browse/KYLIN-4929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17299200#comment-17299200
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ASF GitHub Bot commented on KYLIN-4929:
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zzcclp commented on a change in pull request #1605:
URL: https://github.com/apache/kylin/pull/1605#discussion_r591974403
##########
File path:
server-base/src/main/java/org/apache/kylin/rest/metrics/QueryMetricsFacade.java
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@@ -84,6 +84,9 @@ private static void updateMetricsToLocal(SQLRequest
sqlRequest, SQLResponse sqlR
update(getQueryMetrics(projectName), sqlResponse);
String cube = sqlResponse.getCube();
+ if (cube == null) {
Review comment:
It's better use `StringUtils.isEmpty(cube)` to check.
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> skip metrics update for simple queries to avoid NPE warnings
> ------------------------------------------------------------
>
> Key: KYLIN-4929
> URL: https://issues.apache.org/jira/browse/KYLIN-4929
> Project: Kylin
> Issue Type: Improvement
> Components: Metrics
> Reporter: Congling Xia
> Assignee: Congling Xia
> Priority: Minor
> Fix For: v3.1.2
>
>
> Users may use simple queries like 'select 1' to check the availability of
> kylin service. No realization is needed for such queries. Metric system will
> raise NullPointerException when trying to get the name of the realization.
> It does not cause the query to fail, but prints a lot of annoying warning
> logs with stack-traces.
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