Zhankun Tang created YARN-9218:
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Summary: When register to MockRM, MockNM spend 30s on
InetAddress.getByName(name).getHostAddress();
Key: YARN-9218
URL: https://issues.apache.org/jira/browse/YARN-9218
Project: Hadoop YARN
Issue Type: Improvement
Reporter: Zhankun Tang
In a test case, reproduce the issue with below code. And you'll see that this
three code spends at least 30 seconds to complete.
{code:java}
MockRM rm1 = new MockRM(conf);
rm1.start();
rm1.registerNode("h1:1234", 2 * GB, 1);{code}
The root cause is when "registerNode". It will spend 30 seconds in below methodÂ
which is invoked in RackResolver, NodeListManager.CachedResolver and
NodeListManager.DirectResolver which is used to check a host when registering.
{code:java}
InetAddress.getByName(name).getHostAddress();{code}
We should mock the RackResolver.resolve(hostname) and resolver in
NodeListManager to eliminate the wasting time.
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