xinglin commented on code in PR #5803:
URL: https://github.com/apache/hadoop/pull/5803#discussion_r1258987581
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hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ObserverReadProxyProvider.java:
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@@ -648,6 +645,7 @@ public synchronized void close() throws IOException {
}
}
failoverProxy.close();
+ nnProbingThreadPool.shutdown();
Review Comment:
The issue is previously we did not set _allowCoreThreadTimeout_ to true. So,
the core thread will be kept running, though there is no new tasks submitted.
As long as there is a thread running, JVM won't be shut down (unless we force
it with an explicit `System.exit()`).
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