Mingliang Liu created HADOOP-13305:
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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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