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Posted to hdfs-dev@hadoop.apache.org by "Yongjun Zhang (JIRA)" <ji...@apache.org> on 2014/06/10 18:41:02 UTC

[jira] [Created] (HDFS-6510) WebHdfs clients clears the delegation token on retry (for HA), thus failing retry requests

Yongjun Zhang created HDFS-6510:
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             Summary: WebHdfs clients clears the delegation token on retry (for HA), thus failing retry requests
                 Key: HDFS-6510
                 URL: https://issues.apache.org/jira/browse/HDFS-6510
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.0
            Reporter: Yongjun Zhang
            Assignee: Yongjun Zhang


In WebHdfs clients connected to a HA HDFS service, when a failure (that is inferred as a failover) happens and retry is attempted, the delegation token previously initialized is cleared. For token based auth, this causes all the subsequent retries to fail due to auth errors.
See "delegationToken = null" in method WebHdfsFileSystem.resetStateToFailOver.
This issue would not only show up on failover, but happens more commonly when the first NN specified in the config is not reachable.




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