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https://issues.apache.org/jira/browse/KYLIN-3588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16630557#comment-16630557
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ASF GitHub Bot commented on KYLIN-3588:
---------------------------------------
tttMelody commented on a change in pull request #248: KYLIN-3588, fix
potentially duplicate putting in RemoveBlackoutRealiz…
URL: https://github.com/apache/kylin/pull/248#discussion_r220956979
##########
File path:
query/src/main/java/org/apache/kylin/query/routing/rules/RemoveBlackoutRealizationsRule.java
##########
@@ -58,14 +58,16 @@ public static boolean accept(IRealization real) {
private static IRealizationFilter getFilterImpl(KylinConfig conf) {
IRealizationFilter filter = filters.get(conf);
- if (filter == null) {
- try {
- Class<? extends IRealizationFilter> clz =
ClassUtil.forName(conf.getQueryRealizationFilter(), IRealizationFilter.class);
- filter =
clz.getConstructor(KylinConfig.class).newInstance(conf);
- } catch (Exception e) {
- throw new RuntimeException(e);
+ synchronized (RemoveBlackoutRealizationsRule.class) {
Review comment:
Thanks shaofeng! I'll refine this.
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> Potentially duplicate put to RemoveBlackoutRealizationsRule#filters map
> -----------------------------------------------------------------------
>
> Key: KYLIN-3588
> URL: https://issues.apache.org/jira/browse/KYLIN-3588
> Project: Kylin
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: jiatao.tao
> Priority: Minor
>
> Here is related code:
> {code}
> IRealizationFilter filter = filters.get(conf);
> if (filter == null) {
> try {
> Class<? extends IRealizationFilter> clz =
> ClassUtil.forName(conf.getQueryRealizationFilter(), IRealizationFilter.class);
> filter =
> clz.getConstructor(KylinConfig.class).newInstance(conf);
> } catch (Exception e) {
> throw new RuntimeException(e);
> }
> filters.put(conf, filter);
> {code}
> Two threads may find out there is no filter for conf, they would proceed with
> creation of IRealizationFilter instances and try to put into the map.
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