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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13305) Define common statistics names across schemes
Date Wed, 22 Jun 2016 00:08:58 GMT
Mingliang Liu created HADOOP-13305:

             Summary: Define common statistics names across schemes
                 Key: HADOOP-13305
                 URL: https://issues.apache.org/jira/browse/HADOOP-13305
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs
    Affects Versions: 2.8.0
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu

The {{StorageStatistics}} provides a pretty general interface, i.e. {{getLong(name)}} and
{{getLongStatistics()}}. There is no shared or standard names for the storage statistics and
thus the getLong(name) is up to the implementation of storage statistics. The problems:
# For the common statistics, downstream applications expect the same statistics name across
different storage statistics and/or file system schemes. Chances are they have to use {{DFSOpsCountStorageStatistics#getLong(“getStatus”)}}
and {{S3A.Statistics#getLong(“get_status”)}} for retrieving the getStatus operation stat.
# Moreover, probing per-operation stats is hard if there is no standard/shared common names.

It makes a lot of sense for different schemes to issue the per-operation stats of the same
name. Meanwhile, every FS will have its own internal things to count, which can't be centrally
defined or managed. But there are some common which would be easier managed if they all had
the same name.

Another motivation is that having a common set of names here will encourage uniform instrumentation
of all filesystems; it will also make it easier to analyze the output of runs, were the stats
to be published to a "performance log" similar to the audit log. See Steve's work for S3 
(e.g. [HADOOP-13171])

This jira is track the effort of defining common StorageStatistics entry names.

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