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https://issues.apache.org/jira/browse/HADOOP-13065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HADOOP-13065:
-----------------------------------
Attachment: HADOOP-13065.010.patch
Thanks [~cmccabe] for the comment. The v10 patch deprecates the getStatistics()
API, and fixes the simple checkstyle warning.
One quick question is that, some of the storage statistics classes (e.g.
{{GlobalStorageStatistics}} are annotated as {{Stable}}, do we have to be a bit
more conservative by making them {{Unstable}} before ultimately removing the
Statistics?
As follow-on work,
# We can move the rack-awareness read bytes to a separate storage statistics as
it's only used by HDFS
# We can remove Statistics API, but keep the thread local implementation in
{{FileSystemStorageStatistics}} class.
I will update the previously filed jiras [HADOOP-13032] and [HADOOP-13031]
accordingly after this patch is in the trunk.
> Add a new interface for retrieving FS and FC Statistics
> -------------------------------------------------------
>
> Key: HADOOP-13065
> URL: https://issues.apache.org/jira/browse/HADOOP-13065
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Reporter: Ram Venkatesh
> Assignee: Mingliang Liu
> Attachments: HADOOP-13065-007.patch, HADOOP-13065.008.patch,
> HADOOP-13065.009.patch, HADOOP-13065.010.patch, HDFS-10175.000.patch,
> HDFS-10175.001.patch, HDFS-10175.002.patch, HDFS-10175.003.patch,
> HDFS-10175.004.patch, HDFS-10175.005.patch, HDFS-10175.006.patch,
> TestStatisticsOverhead.java
>
>
> 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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