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https://issues.apache.org/jira/browse/HDFS-6982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14173030#comment-14173030
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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/12675082/HDFS-6982.v3.patch
against trunk revision f19771a.
{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:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of 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.snapshot.TestSnapshotMetrics
org.apache.hadoop.hdfs.server.namenode.TestCheckpoint
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.TestLazyPersistFiles
org.apache.hadoop.hdfs.server.blockmanagement.TestReplicationPolicyConsiderLoad
org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication
org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencing
org.apache.hadoop.hdfs.server.datanode.TestIncrementalBrVariations
org.apache.hadoop.hdfs.server.namenode.TestEditLog
org.apache.hadoop.hdfs.TestSafeMode
org.apache.hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics
org.apache.hadoop.hdfs.server.blockmanagement.TestReplicationPolicyWithNodeGroup
org.apache.hadoop.hdfs.server.namenode.TestFSNamesystemMBean
org.apache.hadoop.hdfs.server.blockmanagement.TestReplicationPolicy
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/8433//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8433//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,
> 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).
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