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Hadoop QA commented on HDFS-4452: --------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12567527/getAdditionalBlock.patch against trunk revision . {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:red}-1 tests included{color}. The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch. {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:green}+1 findbugs{color}. The patch does not introduce any 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:green}+1 core tests{color}. The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs. {color:green}+1 contrib tests{color}. The patch passed contrib unit tests. Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3933//testReport/ Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3933//console This message is automatically generated. > getAdditionalBlock() can create multiple blocks if the client times out and > retries. > ------------------------------------------------------------------------------------ > > Key: HDFS-4452 > URL: https://issues.apache.org/jira/browse/HDFS-4452 > Project: Hadoop HDFS > Issue Type: Bug > Components: namenode > Affects Versions: 2.0.2-alpha > Reporter: Konstantin Shvachko > Assignee: Konstantin Shvachko > Priority: Critical > Attachments: getAdditionalBlock.patch, TestAddBlockRetry.java > > > HDFS client tries to addBlock() to a file. If NameNode is busy the client can > timeout and will reissue the same request again. The two requests will race > with each other in {{FSNamesystem.getAdditionalBlock()}}, which can result in > creating two new blocks on the NameNode while the client will know of only > one of them. This eventually results in {{NotReplicatedYetException}} because > the extra block is never reported by any DataNode, which stalls file creation > and puts it in invalid state with an empty block in the middle. -- 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