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Posted to common-dev@hadoop.apache.org by "Roger Liu (Jira)" <ji...@apache.org> on 2019/09/03 23:33:00 UTC

[jira] [Created] (HADOOP-16543) Cached DNS name resolution error

Roger Liu created HADOOP-16543:
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             Summary: Cached DNS name resolution error
                 Key: HADOOP-16543
                 URL: https://issues.apache.org/jira/browse/HADOOP-16543
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 3.1.2
            Reporter: Roger Liu


In Kubernetes, the a node may go down and then come back later with a different IP address. Yarn clients which are already running will be unable to rediscover the node after it comes back up due to caching the original IP address. This is problematic for cases such as Spark HA on Kubernetes, as the node containing the resource manager may go down and come back up, meaning existing node managers must then also be restarted.



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