Xianyin Xin created YARN-3639:
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Summary: It takes too long time for RM to recover all apps if the
original active RM and namenode is deployed on the same node.
Key: YARN-3639
URL: https://issues.apache.org/jira/browse/YARN-3639
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Reporter: Xianyin Xin
Assignee: Xianyin Xin
If the node on which the active RM runs dies and if the active namenode is
running on the same node, the new RM will take long time to recover all apps.
After analysis, we found the root cause is renewing HDFS tokens in the
recovering process. The HDFS client created by the renewer would firstly try to
connect to the original namenode, the result of which is time-out after 10~20s,
and then the client tries to connect to the new namenode. The entire recovery
cost 15*#apps seconds according our test.
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