Xing Lin created HDFS-17067:
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Summary: allowCoreThreadTimeOut should be set to true for
nnProbingThreadPool in ObserverReadProxy
Key: HDFS-17067
URL: https://issues.apache.org/jira/browse/HDFS-17067
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 3.4.0
Reporter: Xing Lin
Assignee: Xing Lin
In HDFS-17030, we introduced an ExecutorService, to submit getHAServiceState()
requests. We constructed the ExecutorService directly from a basic
ThreadPoolExecutor, without setting _allowCoreThreadTimeOut_ to true. Then, the
core thread will be kept up and running even when the main thread exits. To fix
it, one could set _allowCoreThreadTimeOut_ to true. However, in this PR, we
decide to directly use an existing executorService implementation
(_BlockingThreadPoolExecutorService_) in hadoop instead. It takes care of
setting _allowCoreThreadTimeOut_ and allowing setting the thread prefix.
Second minor issue is we did not shutdown the executorService in close(). It is
a minor issue as close() will only be called when the garbage collector starts
to reclaim an ObserverReadProxyProvider object, not when there is no reference
to the ObserverReadProxyProvider object. The time between when an
ObserverReadProxyProvider becomes dereferenced and when the garage collector
actually starts to reclaim that object is out of control/under-defined (unless
the program is shutdown with an explicit System.exit(1)).
{code:java}
private final ExecutorService nnProbingThreadPool =
new ThreadPoolExecutor(1, 4, 1L, TimeUnit.MINUTES,
new ArrayBlockingQueue<Runnable>(1024));
{code}
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