[jira] [Created] (HDFS-13166) [SPS]: Implement caching mechanism to keep LIVE datanodes to minimize costly getLiveDatanodeStorageReport() calls

["Rakesh R (JIRA)" <ji...@apache.org>]

Rakesh R created HDFS-13166:
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             Summary: [SPS]: Implement caching mechanism to keep LIVE datanodes to minimize costly getLiveDatanodeStorageReport() calls
                 Key: HDFS-13166
                 URL: https://issues.apache.org/jira/browse/HDFS-13166
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Rakesh R
            Assignee: Rakesh R


Presently {{#getLiveDatanodeStorageReport}} is fetched for every file and does the computation. This task is to discuss and implement a cache mechanism to minimize the number of function calls. Probably, we could define a configurable refresh interval and periodically refresh the DN cache by fetching latest {{#getLiveDatanodeStorageReport}}.



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