arina-ielchiieva commented on a change in pull request #1625: DRILL-7008:
Drillbits: clear stale shutdown hooks
URL: https://github.com/apache/drill/pull/1625#discussion_r251373908
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/server/Drillbit.java
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@@ -258,6 +260,13 @@ public synchronized void close() {
}
final Stopwatch w = Stopwatch.createStarted();
logger.debug("Shutdown begun.");
+ // We don't really want for Drillbits to pile up in memory, so the hook
should be removed
+ // It might be better to use PhantomReferences to cleanup as soon as
Drillbit becomes
+ // unreachable, however current approach seems to be good enough.
+ Thread shutdownHook = this.shutdownHook;
+ if (shutdownHook != null && Thread.currentThread() != shutdownHook) {
+ Runtime.getRuntime().removeShutdownHook(shutdownHook);
Review comment:
@vlsi `removeShutdownHook` can throw `IllegalStateException` if the virtual
machine is already in the process of shutting down. Maybe we should add try /
catch block to ignore such exception?
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