lei w created HDFS-17270:
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Summary: Fix ZKDelegationTokenSecretManagerImpl use closed
zookeeper Client to get token in some case
Key: HDFS-17270
URL: https://issues.apache.org/jira/browse/HDFS-17270
Project: Hadoop HDFS
Issue Type: Bug
Reporter: lei w
Attachments: CuratorFrameworkException
Now, we use CuratorFramework to simplifies using ZooKeeper in
ZKDelegationTokenSecretManagerImpl and we always hold the same zookeeperClient
after initialization ZKDelegationTokenSecretManagerImpl. But in some cases like
network problem , CuratorFramework may close current zookeeperClient and create
new one. In this case , we will use a zkclient which has been closed to get
token. We encountered this situation in our cluster，exception information in
attachment.
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