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Posted to common-issues@hadoop.apache.org by "Ming Ma (JIRA)" <ji...@apache.org> on 2016/06/07 00:42:21 UTC
[jira] [Commented] (HADOOP-13031) Refactor rack-aware counters from
FileSystemStorageStatistics to HFDS specific StorageStatistics
[ https://issues.apache.org/jira/browse/HADOOP-13031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317565#comment-15317565 ]
Ming Ma commented on HADOOP-13031:
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Thanks [~liuml07]. Do you have a MAPREDUCE jira to consume any StorageStatistics and expose them to MR counters? MAPREDUCE-6660 was created specifically for network distance, but maybe it is better to solve the general case.
> Refactor rack-aware counters from FileSystemStorageStatistics to HFDS specific StorageStatistics
> ------------------------------------------------------------------------------------------------
>
> Key: HADOOP-13031
> URL: https://issues.apache.org/jira/browse/HADOOP-13031
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Affects Versions: 2.9.0
> Reporter: Mingliang Liu
>
> [HADOOP-13065] added a new interface for retrieving FS and FC Statistics. This jira is to refactor the code that maintains rack-aware read metrics to use the newly added StorageStatistics. Specially,
> # Rack-aware read bytes metrics is mostly specific to HDFS. For example, local file system doesn't need that. We consider to move it from base FileSystemStorageStatistics to a dedicated HDFS specific StorageStatistics sub-class.
> # We would have to develop an optimized thread-local mechanism to do this, to avoid causing a performance regression in HDFS stream performance.
> Optionally, it would be better to simply move this to HDFS's existing per-stream {{ReadStatistics}} for now. As [HDFS-9579] states, ReadStatistics metrics are only accessible via {{DFSClient}} or {{DFSInputStream}}. Not something that application framework such as MR and Tez can get to.
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