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Hadoop QA commented on HDFS-5563: --------------------------------- {color:green}+1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12616150/HDFS-5563.003.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: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-nfs. {color:green}+1 contrib tests{color}. The patch passed contrib unit tests. Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/5597//testReport/ Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5597//console This message is automatically generated. > NFS gateway should commit the buffered data when read request comes after > write to the same file > ------------------------------------------------------------------------------------------------ > > Key: HDFS-5563 > URL: https://issues.apache.org/jira/browse/HDFS-5563 > Project: Hadoop HDFS > Issue Type: Improvement > Components: nfs > Reporter: Brandon Li > Assignee: Brandon Li > Attachments: HDFS-5563.001.patch, HDFS-5563.002.patch, > HDFS-5563.003.patch > > > HDFS write is asynchronous and data may not be available to read immediately > after write. > One of the main reason is that DFSClient doesn't flush data to DN until its > local buffer is full. > To workaround this problem, when a read comes after write to the same file, > NFS gateway should sync the data so the read request can get the latest > content. The drawback is that, the frequent hsync() call can slow down data > write. -- This message was sent by Atlassian JIRA (v6.1#6144)