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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7430) Refactor the BlockScanner to use O(1) memory and use multiple threads
Date Mon, 24 Nov 2014 22:29:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14223654#comment-14223654
] 

Hadoop QA commented on HDFS-7430:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12683394/HDFS-7430.003.patch
  against trunk revision 8e253cb.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 11 new or modified
test files.

      {color:red}-1 javac{color}.  The applied patch generated 1219 javac compiler warnings
(more than the trunk's current 1218 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:red}-1 findbugs{color}.  The patch appears to introduce 1 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.TestRenameWithSnapshots
                  org.apache.hadoop.hdfs.server.datanode.TestNNHandlesCombinedBlockReport
                  org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshot
                  org.apache.hadoop.hdfs.server.datanode.TestNNHandlesBlockReportPerStorage
                  org.apache.hadoop.hdfs.server.balancer.TestBalancer
                  org.apache.hadoop.hdfs.server.namenode.TestFSImageWithSnapshot
                  org.apache.hadoop.hdfs.server.namenode.snapshot.TestINodeFileUnderConstructionWithSnapshot
                  org.apache.hadoop.hdfs.server.namenode.snapshot.TestNestedSnapshots
                  org.apache.hadoop.hdfs.server.datanode.TestBlockScanner
                  org.apache.hadoop.hdfs.server.blockmanagement.TestOverReplicatedBlocks

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8823//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8823//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Javac warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8823//artifact/patchprocess/diffJavacWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8823//console

This message is automatically generated.

> Refactor the BlockScanner to use O(1) memory and use multiple threads
> ---------------------------------------------------------------------
>
>                 Key: HDFS-7430
>                 URL: https://issues.apache.org/jira/browse/HDFS-7430
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-7430.002.patch, HDFS-7430.003.patch, memory.png
>
>
> We should update the BlockScanner to use a constant amount of memory by keeping track
of what block was scanned last, rather than by tracking the scan status of all blocks in memory.
 Also, instead of having just one thread, we should have a verification thread per hard disk
(or other volume), scanning at a configurable rate of bytes per second.



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