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  1. Hadoop Common
  2. HADOOP-17358

Improve excessive reloading of Configurations

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      daryn reported that adding a new resource to a conf forces a complete reload of the conf instead of just loading the new resource. Instantiating a SSLFactory adds a new resource for the ssl client/server file. Formerly only the KMS client used the SSLFactory but now TLS/RPC uses it too.

      The reload is so costly that RM token cancellation falls behind by hours or days. The accumulation of uncancelled tokens in the KMS rose from a few thousand to hundreds of thousands which risks ZK scalability issues causing a KMS outage.

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              ahussein Ahmed Hussein
              ahussein Ahmed Hussein
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