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https://issues.apache.org/jira/browse/HDFS-6659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14121401#comment-14121401
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Hadoop QA commented on HDFS-6659:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12666459/HDFS-6659.patch
against trunk revision 8f1a668.
{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}. There were no new javadoc 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 2.0.3) warnings.
{color:red}-1 release audit{color}. The applied patch generated 2
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.web.TestWebHdfsFileSystemContract
org.apache.hadoop.hdfs.server.namenode.ha.TestPipelinesFailover
org.apache.hadoop.hdfs.server.balancer.TestBalancerWithSaslDataTransfer
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/7895//testReport/
Release audit warnings:
https://builds.apache.org/job/PreCommit-HDFS-Build/7895//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7895//console
This message is automatically generated.
> Create a Block List
> -------------------
>
> Key: HDFS-6659
> URL: https://issues.apache.org/jira/browse/HDFS-6659
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.4.1
> Reporter: Amir Langer
> Assignee: Amir Langer
> Labels: perfomance
> Attachments: HDFS-6659.patch
>
>
> BlockList - An efficient array based list that can extend its capacity with
> two main features:
> 1. Gaps (result of remove operations) are managed internally without the need
> for extra memory - We create a linked list of gaps by using the array index
> as references + An int to the head of the gaps list. In every insert
> operation, we first use any available gap before extending the array.
> 2. Array extension is done by chaining different arrays, not by allocating a
> larger array and copying all its data across. This is a lot less heavy in
> terms of latency for that particular call. It also avoids having large amount
> of contiguous heap space and so behaves nicer with garbage collection.
>
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