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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8779) WebUI can't display randomly generated block ID
Date Fri, 28 Aug 2015 18:25:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720366#comment-14720366
] 

Andrew Wang commented on HDFS-8779:
-----------------------------------

I'm +1 on the 03 patch, seems like the cleanest and least intrusive change on the table. [~wheat9]
I'll commit in a while unless you have more comments.

> WebUI can't display randomly generated block ID
> -----------------------------------------------
>
>                 Key: HDFS-8779
>                 URL: https://issues.apache.org/jira/browse/HDFS-8779
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>            Reporter: Walter Su
>            Assignee: Walter Su
>            Priority: Minor
>         Attachments: HDFS-8779.01.patch, HDFS-8779.02.patch, HDFS-8779.03.patch, HDFS-8779.04.patch,
after-02-patch.png, before.png, patch-to-json-parse.txt
>
>
> Old release use randomly generated block ID(HDFS-4645).
> max value of Long in Java is 2^63-1
> max value of -number-(*integer*) in Javascript is 2^53-1. ( See [Link|https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER])
> Which means almost every randomly generated block ID exceeds MAX_SAFE_INTEGER.
> A integer which exceeds MAX_SAFE_INTEGER cannot be represented in Javascript.



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