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https://issues.apache.org/jira/browse/HIVE-19050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426644#comment-16426644
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Peter Vary commented on HIVE-19050:
-----------------------------------
+1
> DBNotificationListener does not catch exceptions in the cleaner thread
> ----------------------------------------------------------------------
>
> Key: HIVE-19050
> URL: https://issues.apache.org/jira/browse/HIVE-19050
> Project: Hive
> Issue Type: Bug
> Components: Metastore, Standalone Metastore
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Priority: Minor
> Attachments: HIVE-19050.01.patch
>
>
> The DbNotificationListener class has a separate thread which cleans the old
> notifications from the database. Here is the snippet from the {{run}} method.
> {noformat}
> public void run() {
> while (true) {
> rs.cleanNotificationEvents(ttl);
> LOG.debug("Cleaner thread done");
> try {
> Thread.sleep(sleepTime);
> } catch (InterruptedException e) {
> LOG.info("Cleaner thread sleep interrupted", e);
> }
> }
> }
> {noformat}
> If {{rs.cleanNotificationEvents}} throws a RuntimeException which datanucleus
> can throw the exception remains uncaught and the thread will die. This can
> lead to older notifications never getting cleaned until we restart HMS. Given
> that many operations generate loads of events, the notification log table can
> quickly have thousands of rows which are never get cleaned up.
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