[jira] [Updated] (HDFS-10175) add per-operation stats to FileSystem.Statistics

["Jitendra Nath Pandey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-10175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jitendra Nath Pandey updated HDFS-10175:
----------------------------------------
    Assignee: Mingliang Liu

> add per-operation stats to FileSystem.Statistics
> ------------------------------------------------
>
>                 Key: HDFS-10175
>                 URL: https://issues.apache.org/jira/browse/HDFS-10175
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Ram Venkatesh
>            Assignee: Mingliang Liu
>
> Currently FileSystem.Statistics exposes the following statistics:
> BytesRead
> BytesWritten
> ReadOps
> LargeReadOps
> WriteOps
> These are in-turn exposed as job counters by MapReduce and other frameworks. There is logic within DfsClient to map operations to these counters that can be confusing, for instance, mkdirs counts as a writeOp.
> Proposed enhancement:
> Add a statistic for each DfsClient operation including create, append, createSymlink, delete, exists, mkdirs, rename and expose them as new properties on the Statistics object. The operation-specific counters can be used for analyzing the load imposed by a particular job on HDFS. 
> For example, we can use them to identify jobs that end up creating a large number of files.
> Once this information is available in the Statistics object, the app frameworks like MapReduce can expose them as additional counters to be aggregated and recorded as part of job summary.



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