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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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org