liying created HDFS-14634:
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Summary: Dynamically generates the namenode's election priorities
Key: HDFS-14634
URL: https://issues.apache.org/jira/browse/HDFS-14634
Project: Hadoop HDFS
Issue Type: Improvement
Components: auto-failover
Affects Versions: 2.7.2
Reporter: liying
Dynamically generates the namenode's election priorities in the zkfc Module。
For example，when the zookeeper crash，all of the namenode remain in their
original state。 Then the zookeeper service recovery，the original active
namenode should have priority to participate in the election。
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