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https://issues.apache.org/jira/browse/HDFS-14084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753266#comment-16753266
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Ayush Saxena commented on HDFS-14084:
-------------------------------------
Hi!!!
I guess the newly introduced test seems to be failing at trunk!!!
[https://builds.apache.org/job/hadoop-qbt-trunk-java8-linux-x86/1028/testReport/junit/org.apache.hadoop.hdfs/TestClientMetrics/testGetMetrics/]
Even at Pre-Commit Jobs too
[https://builds.apache.org/job/PreCommit-HDFS-Build/26062/testReport/junit/org.apache.hadoop.hdfs/TestClientMetrics/testGetMetrics/]
Pls give a check to the package name for the Test too.
{code:java}
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestClientMetrics.java
{code}
There is a difference b/w the location and the package set.
{code:java}
+package org.apache.hadoop.hdfs;
{code}
I guess it should be org.apache.hadoop.hdfs.client.impl instead
org.apache.hadoop.hdfs from the location where it is put in ; If I am not
missing some context. :)
> Need for more stats in DFSClient
> --------------------------------
>
> Key: HDFS-14084
> URL: https://issues.apache.org/jira/browse/HDFS-14084
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Pranay Singh
> Assignee: Pranay Singh
> Priority: Minor
> Fix For: 3.3.0
>
> Attachments: HDFS-14084.001.patch, HDFS-14084.002.patch,
> HDFS-14084.003.patch, HDFS-14084.004.patch, HDFS-14084.005.patch,
> HDFS-14084.006.patch, HDFS-14084.007.patch, HDFS-14084.008.patch,
> HDFS-14084.009.patch, HDFS-14084.010.patch, HDFS-14084.011.patch,
> HDFS-14084.012.patch, HDFS-14084.013.patch
>
>
> The usage of HDFS has changed from being used as a map-reduce filesystem, now
> it's becoming more of like a general purpose filesystem. In most of the cases
> there are issues with the Namenode so we have metrics to know the workload or
> stress on Namenode.
> However, there is a need to have more statistics collected for different
> operations/RPCs in DFSClient to know which RPC operations are taking longer
> time or to know what is the frequency of the operation.These statistics can
> be exposed to the users of DFS Client and they can periodically log or do
> some sort of flow control if the response is slow. This will also help to
> isolate HDFS issue in a mixed environment where on a node say we have Spark,
> HBase and Impala running together. We can check the throughput of different
> operation across client and isolate the problem caused because of noisy
> neighbor or network congestion or shared JVM.
> We have dealt with several problems from the field for which there is no
> conclusive evidence as to what caused the problem. If we had metrics or stats
> in DFSClient we would be better equipped to solve such complex problems.
> List of jiras for reference:
> -------------------------
> HADOOP-15538 HADOOP-15530 ( client side deadlock)
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