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https://issues.apache.org/jira/browse/HADOOP-2110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554091
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dhruba borthakur commented on HADOOP-2110:
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1. In BlockListAsLongs() , you access iBlockList before checking whether it is 
null.
2. Also, BlockListAsLongs() constructor checks th condition "if 
(iBlockList.length%LONGS_PER_BLOCK != 0)" twice.

3. There should be no "public" methods in BlockListAsLongs. These methods 
should be package private.

All other portions of code looks good. +1.

> Block Report Optimization: Replace class instance
> -------------------------------------------------
>
>                 Key: HADOOP-2110
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2110
>             Project: Hadoop
>          Issue Type: Sub-task
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Robert Chansler
>            Assignee: Sanjay Radia
>             Fix For: 0.16.0
>
>         Attachments: brAsLongsPatch2.txt, brAsLongsPatch3.txt, comaprison.txt
>
>
> Block report processing can be more efficient if instances of the block ID 
> class are replaced with a sequence of longs.

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