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https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044689#comment-13044689
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Hadoop QA commented on HDFS-1323:
---------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12481528/hdfs-1323-trunk.txt
against trunk revision 1131331.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 5 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
-1 findbugs. The patch appears to introduce 3 new Findbugs (version 1.3.9)
warnings.
-1 release audit. The applied patch generated 1 release audit warnings
(more than the trunk's current 0 warnings).
-1 core tests. The patch failed these core unit tests:
org.apache.hadoop.hdfs.server.namenode.TestLargeDirectoryDelete
org.apache.hadoop.hdfs.server.namenode.TestParallelImageWrite
org.apache.hadoop.hdfs.TestFileAppend2
+1 contrib tests. The patch passed contrib unit tests.
+1 system test framework. The patch passed system test framework compile.
Test results:
https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/709//testReport/
Release audit warnings:
https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/709//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Findbugs warnings:
https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/709//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/709//console
This message is automatically generated.
> Pool/share file channels for HDFS read
> --------------------------------------
>
> Key: HDFS-1323
> URL: https://issues.apache.org/jira/browse/HDFS-1323
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Jay Booth
> Attachments: hdfs-1323-20100730.patch, hdfs-1323-trunk.txt
>
>
> Currently, all reads in HDFS require opening and closing the underlying
> block/meta filechannels. We could pool these filechannels and save some
> system calls and other work. Since HDFS read requests can be satisfied by
> positioned reads and transferTos, we can even share these filechannels
> between concurrently executing requests.
> The attached patch was benchmarked as part of work on HDFS-918 and exhibited
> a 10% performance increase for small random reads.
> This does not affect client logic and involves minimal change to server
> logic. Patch is based on branch 20-append.
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