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From "Hanisha Koneru (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11789) Maintain Short-Circuit Read Statistics
Date Tue, 09 May 2017 23:13:04 GMT
Hanisha Koneru created HDFS-11789:
-------------------------------------

             Summary: Maintain Short-Circuit Read Statistics
                 Key: HDFS-11789
                 URL: https://issues.apache.org/jira/browse/HDFS-11789
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Hanisha Koneru
            Assignee: Hanisha Koneru


If a disk or controller hardware is faulty then short-circuit read requests can stall indefinitely
while reading from the file descriptor. Currently there is no way to detect when short-circuit
read requests are slow or blocked. 

This Jira proposes that each BlockReaderLocal maintain read statistics while it is active
by measuring the time taken for a pre-determined fraction of read requests. These per-reader
stats can be aggregated into global stats when the reader is closed. The aggregate statistics
can be exposed via JMX.



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