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Hadoop QA commented on HDFS-6659: --------------------------------- \\ \\ | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | pre-patch | 14m 37s | Pre-patch trunk compilation is healthy. | | {color:green}+1{color} | @author | 0m 0s | The patch does not contain any @author tags. | | {color:green}+1{color} | tests included | 0m 0s | The patch appears to include 1 new or modified test files. | | {color:red}-1{color} | javac | 1m 25s | The patch appears to cause the build to fail. | \\ \\ || Subsystem || Report/Notes || | Patch URL | http://issues.apache.org/jira/secure/attachment/12666459/HDFS-6659.patch | | Optional Tests | javadoc javac unit findbugs checkstyle | | git revision | trunk / a319771 | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10734/console | This message was 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. > -- This message was sent by Atlassian JIRA (v6.3.4#6332)