[jira] [Resolved] (SAMZA-872) Remove unsafe log4j DailyRollingFileAppender from docs and hello-samza

["Yi Pan (Data Infrastructure) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SAMZA-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yi Pan (Data Infrastructure) resolved SAMZA-872.
------------------------------------------------
       Resolution: Fixed
    Fix Version/s: 0.10.1

> Remove unsafe log4j DailyRollingFileAppender from docs and hello-samza
> ----------------------------------------------------------------------
>
>                 Key: SAMZA-872
>                 URL: https://issues.apache.org/jira/browse/SAMZA-872
>             Project: Samza
>          Issue Type: Bug
>            Reporter: Jake Maes
>            Assignee: Branislav Cogic
>              Labels: newbie
>             Fix For: 0.10.1
>
>         Attachments: SAMZA-872.0.patch, SAMZA-872.1.patch
>
>
> DailyRollingFileAppender is known to have synchronization issues and cause data loss. It even claims this in its own documentation
> https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/DailyRollingFileAppender.html
> We shouldn't be referencing such a problematic appender in Samza. Instead, we could reference RollingFileAppender with these settings:
> <appender name="RollingAppender" class="org.apache.log4j.RollingFileAppender">
>     <param name="File" value="${samza.log.dir}/${samza.container.name}.log" />
>     <param name="MaxFileSize" value="256MB" />
>     <param name="MaxBackupIndex" value="20" />
>     <layout class="org.apache.log4j.PatternLayout">
>       <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n" />
>     </layout>
>   </appender>
> Docs:
> https://samza.apache.org/learn/documentation/0.10/jobs/logging.html
> Hello Samza:
> https://github.com/apache/samza-hello-samza/blob/master/src/main/resources/log4j.xml



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