[jira] [Work started] (HBASE-26767) Rest server should not use a large Header Cache.

["Sergey Soldatov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-26767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-26767 started by Sergey Soldatov.
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> Rest server should not use a large Header Cache.
> ------------------------------------------------
>
>                 Key: HBASE-26767
>                 URL: https://issues.apache.org/jira/browse/HBASE-26767
>             Project: HBase
>          Issue Type: Bug
>          Components: REST
>    Affects Versions: 2.4.9
>            Reporter: Sergey Soldatov
>            Assignee: Sergey Soldatov
>            Priority: Major
>
> In the RESTServer we set the HeaderCache size to DEFAULT_HTTP_MAX_HEADER_SIZE (65536). That's not compatible with jetty-9.4.x because the cache size is limited by Character.MAX_VALUE - 1  (65534) there. According to the Jetty source code comments, it's possible to have a buffer overflow in the cache for higher values and that might lead to wrong/incomplete values returned by cache and following incorrect header handling.  
> There are a couple of ways to fix it:
> 1. change the value of DEFAULT_HTTP_MAX_HEADER_SIZE to 65534
> 2. make header cache size configurable and set its size separately from the header size. 
> I believe that the second would give us more flexibility.



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