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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9579) Provide bytes-read-by-network-distance metrics at FileSystem.Statistics level
Date Tue, 17 May 2016 02:11:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285883#comment-15285883

Hudson commented on HDFS-9579:

FAILURE: Integrated in Hadoop-trunk-Commit #9773 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/9773/])
HDFS-10208. Addendum for HDFS-9579: to handle the case when client (sjlee: rev 61f46be071e42f9eb49a54b1bd2e54feac59f808)
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/net/TestNetworkTopology.java
* hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/ClientContext.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
* hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NodeBase.java

> Provide bytes-read-by-network-distance metrics at FileSystem.Statistics level
> -----------------------------------------------------------------------------
>                 Key: HDFS-9579
>                 URL: https://issues.apache.org/jira/browse/HDFS-9579
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>             Fix For: 2.9.0, 3.0.0-alpha1
>         Attachments: HDFS-9579-10.patch, HDFS-9579-2.patch, HDFS-9579-3.patch, HDFS-9579-4.patch,
HDFS-9579-5.patch, HDFS-9579-6.patch, HDFS-9579-7.patch, HDFS-9579-8.patch, HDFS-9579-9.patch,
HDFS-9579-branch-2.patch, HDFS-9579.patch, MR job counters.png
> For cross DC distcp or other applications, it becomes useful to have insight as to the
traffic volume for each network distance to distinguish cross-DC traffic, local-DC-remote-rack,
> FileSystem's existing {{bytesRead}} metrics tracks all the bytes read. To provide additional
metrics for each network distance, we can add additional metrics to FileSystem level and have
{{DFSInputStream}} update the value based on the network distance between client and the datanode.
> {{DFSClient}} will resolve client machine's network location as part of its initialization.
It doesn't need to resolve datanode's network location for each read as {{DatanodeInfo}} already
has the info.
> There are existing HDFS specific metrics such as {{ReadStatistics}} and {{DFSHedgedReadMetrics}}.
But these metrics are only accessible via {{DFSClient}} or {{DFSInputStream}}. Not something
that application framework such as MR and Tez can get to. That is the benefit of storing these
new metrics in FileSystem.Statistics.
> This jira only includes metrics generation by HDFS. The consumption of these metrics
at MR and Tez will be tracked by separated jiras.
> We can add similar metrics for HDFS write scenario later if it is necessary.

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