xinglin commented on code in PR #5803:
URL: https://github.com/apache/hadoop/pull/5803#discussion_r1258986732
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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:
We switched to use BlockingThreadPoolExecutorService, which set
`allowCoreThreadTimeout` to true. When the main thread exits, there won't be
new tasks submitted to the executorService. Then all threads, including the
core threads will be idle and they will all be shut down, due to the
allowCoreThreadTimeout property to be true.
After all threads from the executorService are shutdown, and there is no
active thread, JVM will be shutdown.
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