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https://issues.apache.org/jira/browse/HADOOP-13306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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chillon_m updated HADOOP-13306:
-------------------------------
    Description: 
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
line-705:defineFilter() doesnot check filter if it exists.we need check if it 
exists before add it.

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,maybe 
affact performance.

  was:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java
line-705:defineFilter() doesnot check filter if it exists.we need check if it 
exists before add it.

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.


> add filter doesnot check if it exists in HttpServer
> ---------------------------------------------------
>
>                 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
>            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:defineFilter() doesnot check filter if it exists.we need check if it 
> exists before add it.
> 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,maybe 
> affact performance.



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