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  1. Hadoop Common
  2. HADOOP-12125

Retrying UnknownHostException on a proxy does not actually retry hostname resolution

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Details

    • Bug
    • Status: Open
    • Major
    • Resolution: Unresolved
    • None
    • None
    • ipc
    • None

    Description

      When RetryInvocationHandler attempts to retry an UnknownHostException the hostname fails to be resolved again. The InetSocketAddress in the ConnectionId has cached the fact that the hostname is unresolvable, and when the proxy tries to setup a new Connection object with that ConnectionId it checks if the (cached) resolution result is unresolved and immediately throws.

      The end result is we sleep and retry for no benefit. The hostname resolution is never attempted again.

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          is related to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-12285 Better handling of namenode ip address change

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-15129 Datanode caches namenode DNS lookup failure and cannot startup

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-8068 Do not retry rpc calls If the proxy contains unresolved address

          • Major - Major loss of function.
          • Patch Available

          Activity

            People

              jzhuge John Zhuge
              jlowe Jason Darrell Lowe
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              Dates

                Created:
                Updated: