hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8779) WebUI can't display randomly generated block ID
Date Tue, 21 Jul 2015 00:15:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634318#comment-14634318
] 

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

Yea, so like I said WebHdfsFileSystem's JSON parser does not have the 2^53-1 limitation...that
was an aside to my concern about compatibility, which I think is accurate.

> 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, after-02-patch.png,
before.png
>
>
> Old release use randomly generated block ID(HDFS-4645).
> max value of Long in Java is 2^63-1
> max value of number 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message