[ 
https://issues.apache.org/jira/browse/KYLIN-2780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Fangyuan Deng updated KYLIN-2780:
---------------------------------
    Attachment: jstack.log
                KYLIN-2780.0.patch

> QueryController.getMetadata and CacheController.wipeCache may be deadlock
> -------------------------------------------------------------------------
>
>                 Key: KYLIN-2780
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2780
>             Project: Kylin
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: v1.5.4.1, v2.0.0
>            Reporter: Fangyuan Deng
>            Assignee: liyang
>         Attachments: jstack.log, KYLIN-2780.0.patch
>
>
> When we send update metadata request to the query sever manually,
> while some getMetadata requests come,
> deadlock may happen.
> The jstack log is listed below.
> and we add  a double check in Broadcaster.getInstance to prevent lock each 
> time.
>  public static Broadcaster getInstance(KylinConfig config) {
>         Broadcaster r = CACHE.get(config);
>         if (r != null) {
>             return r;
>         }
>         synchronized (CACHE) {
>             r = CACHE.get(config);
>             if (r != null) {
>                 return r;
>             }



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

Reply via email to