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Hadoop QA commented on HDFS-3990: --------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12549353/HDFS-3990.patch against trunk revision . {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 1 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}. The javadoc tool did not generate any warning messages. {color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse. {color:red}-1 findbugs{color}. The patch appears to introduce 3 new Findbugs (version 1.3.9) 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.blockmanagement.TestReplicationPolicy org.apache.hadoop.hdfs.server.datanode.TestBlockReplacement org.apache.hadoop.hdfs.TestMiniDFSCluster org.apache.hadoop.cli.TestHDFSCLI org.apache.hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks org.apache.hadoop.hdfs.TestReplication {color:green}+1 contrib tests{color}. The patch passed contrib unit tests. Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3347//testReport/ Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/3347//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3347//console This message is automatically generated. > NN's health report has severe performance problems > -------------------------------------------------- > > Key: HDFS-3990 > URL: https://issues.apache.org/jira/browse/HDFS-3990 > Project: Hadoop HDFS > Issue Type: Bug > Components: name-node > Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Priority: Critical > Attachments: HDFS-3990.patch, HDFS-3990.patch, HDFS-3990.patch, > hdfs-3990.txt > > > The dfshealth page will place a read lock on the namespace while it does a > dns lookup for every DN. On a multi-thousand node cluster, this often > results in 10s+ load time for the health page. 10 concurrent requests were > found to cause 7m+ load times during which time write operations blocked. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira