Hanisha Koneru created HDFS-11789:
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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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