[jira] [Updated] (HADOOP-13306) adding filter doesnot check if it exists in HttpServer,this maybe results in degraded performance

["chillon_m (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-13306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

chillon_m updated HADOOP-13306:
-------------------------------
    Summary: adding filter doesnot check if it exists in HttpServer,this maybe results in degraded performance  (was: adding filter doesnot check if it exists in HttpServer,)

> adding filter doesnot check if it exists in HttpServer,this maybe results in degraded performance
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-13306
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13306
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.5.2, 2.7.2, 2.7.3, 2.6.4, 3.0.0-alpha1
>            Reporter: chillon_m
>            Priority: Minor
>         Attachments: 0001-HADOOP-13306(hadoop2.5.2).patch
>
>
> hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
> line-705(hadoop2.5.2):defineFilter() doesnot check filter if it exists.we need check if it exists before add it.so,ervery request/response maybe dealed by same filter many times,maybe affect performance
> another,No_Cache_Filter added twice when create a HttpServer2 object.I think addDefaultApps()  invoke addNoCacheFilter() is unnecessary.because addNoCacheFilter() has already been invoked by createWebAppContext()  in httpServer2 constructor method.every request invoke twice cachefilter.



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