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Hadoop QA commented on HDFS-6982: --------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12676789/HDFS-6982.v5.patch against trunk revision db45f04. {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 3 new or modified test files. {color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings. {color:green}+1 javadoc{color}. There were no new javadoc warning messages. {color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse. {color:red}-1 findbugs{color}. The patch appears to introduce 1 new Findbugs (version 2.0.3) warnings. {color:red}-1 release audit{color}. The applied patch generated 1 release audit warnings. {color:red}-1 core tests{color}. The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs: org.apache.hadoop.hdfs.server.namenode.ha.TestBootstrapStandbyWithQJM {color:green}+1 contrib tests{color}. The patch passed contrib unit tests. Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8513//testReport/ Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8513//artifact/patchprocess/patchReleaseAuditProblems.txt Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8513//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8513//console This message is automatically generated. > nntop: top-like tool for name node users > ----------------------------------------- > > Key: HDFS-6982 > URL: https://issues.apache.org/jira/browse/HDFS-6982 > Project: Hadoop HDFS > Issue Type: New Feature > Reporter: Maysam Yabandeh > Assignee: Maysam Yabandeh > Attachments: HDFS-6982.patch, HDFS-6982.v2.patch, HDFS-6982.v3.patch, > HDFS-6982.v4.patch, HDFS-6982.v5.patch, nntop-design-v1.pdf > > > In this jira we motivate the need for nntop, a tool that, similarly to what > top does in Linux, gives the list of top users of the HDFS name node and > gives insight about which users are sending majority of each traffic type to > the name node. This information turns out to be the most critical when the > name node is under pressure and the HDFS admin needs to know which user is > hammering the name node and with what kind of requests. Here we present the > design of nntop which has been in production at Twitter in the past 10 > months. nntop proved to have low cpu overhead (< 2% in a cluster of 4K > nodes), low memory footprint (less than a few MB), and quite efficient for > the write path (only two hash lookup for updating a metric). -- This message was sent by Atlassian JIRA (v6.3.4#6332)