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https://issues.apache.org/jira/browse/HADOOP-13305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347249#comment-15347249
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Mingliang Liu commented on HADOOP-13305:
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Thank you [[email protected]] for your review and test against S3A. I
appreciate your help very much.
> 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
> Fix For: 2.8.0
>
> Attachments: HADOOP-13305.000.patch, HADOOP-13305.001.patch
>
>
> 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. Thanks to [~cmccabe], [[email protected]], [~hitesh] and [~jnp] for
> offline discussion.
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