Chu Cheng Li created HDDS-17433:
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Summary: Add a freon command for positioned reads on shared input
streams
Key: HDDS-17433
URL: https://issues.apache.org/jira/browse/HDDS-17433
Project: Apache Ozone
Issue Type: Improvement
Components: freon
Reporter: Chu Cheng Li
Assignee: Chu Cheng Li
h3. Problem
* No freon command reads one key through a shared input stream with positioned
reads.
* {{ocokr}} opens a new stream for each read and reads the whole key. Thus it
cannot measure contention between readers of the same stream, for example for
HDDS-17399.
h3. Changes
Add {{ozone freon ocpr}} (ozone-client-positioned-reader). It reads an existing
key.
* {{-t}} threads do random, aligned {{readFully(position, buffer)}} calls of
{{--read-size}} bytes.
* {{--streams S}} opens S streams on the key. {{--clients C}} creates C
{{OzoneClient}} instances.
* Thread i uses stream (i mod S), and stream j uses client (j mod C). The
mapping does not change during the run. Each stream gets the same number of
threads, plus or minus one.
* {{--sequential-readers K}} adds K threads for each stream. Each one reads the
stream from start to end in steps of {{--sequential-read-size}} bytes, and then
starts again.
* The report shows a timer for positioned reads and a timer for sequential
reads.
h3. Tests
* An integration test runs {{ocpr}} with one stream and with two streams, each
with one sequential reader, and checks that all reads succeed.
Related: HDDS-17399.
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