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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7303) Quit using reflection for the method DFSOutputStream#getNumCurrentReplicas(…)
Date Sat, 08 Dec 2012 00:43:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526933#comment-13526933
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Harsh J commented on HBASE-7303:
--------------------------------

Thanks Elliot. I think this could be done using the compat modules. Would you have an example
commit to show how to port it to load from compat? Should I, for example, place the HLog interface
into general hadoop-compat module, and provide hadoop-1 and hadoop-2 implementations of FSHLog
in their own modules? Or would FSHLog itself have to be an interface?
                
> Quit using reflection for the method DFSOutputStream#getNumCurrentReplicas(…)
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-7303
>                 URL: https://issues.apache.org/jira/browse/HBASE-7303
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.96.0
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Minor
>
> Given that we've raised our minimum version guarantee for HBase with 1.x carrying the
0.20-append code finally, and all subsequent releases (0.21*, 0.22, 0.23 and 2) have this
method available in them, I don't see a reason to have the reflection based getNumCurrentReplicas
invocation (via HDFS-826) anymore.
> We could save ourselves quite a bit of perf. penalty by removing this check and simply
calling the method directly, as its API has not changed across releases.

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