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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8779) WebUI can't display randomly generated block ID
Date Tue, 21 Jul 2015 03:18:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Walter Su updated HDFS-8779:
----------------------------
    Attachment: HDFS-8779.04.patch
                patch-to-json-parse.txt

Thanks [~wheat9] for the idea.
json-bigint doesn't have a front-end version. The author gives a browserify version in [here|http://stackoverflow.com/questions/18755125/node-js-is-there-any-proper-way-to-parse-json-with-large-numbers-long-bigint]
The file is up to 79kb.

Since both [BigNumber|https://github.com/MikeMcl/bignumber.js] and [JSON-js|https://github.com/douglascrockford/JSON-js]
have a front-end version. I re-create the file using the idea of json-bigint:

I simply add 2 lines to JSON-js library ( that's how json-bigint does):
{code}
+                if (string.length > 15)
+                   return new BigNumber(string);
{code}
{{patch-to-json-parse.txt}} shows that. I didn't change anything to {{BigNumber}}.

Uploaded 04 patch, tested in chrome/ie11/firefox. I still prefer 03 patch because it's simple.
Both works for me.

> 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 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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