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https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620184#comment-13620184
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Suresh Srinivas commented on HDFS-4538:
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I have not had time to read the patch in detail. The question is, when I
upgrade from branch-1 where I had short circuit reads configured, would it work
on branch-2? Does it need any additional changes to config to make it work?
> allow use of legacy blockreader
> -------------------------------
>
> Key: HDFS-4538
> URL: https://issues.apache.org/jira/browse/HDFS-4538
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, hdfs-client, performance
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-4538.001.patch, HDFS-4538.002.patch,
> HDFS-4538.003.patch, HDFS-4538.004.patch
>
>
> Some users might want to use the legacy block reader, because it is available
> on Windows, whereas the secure solution has not yet been implemented there.
> As described in the mailing list discussion, let's enable this.
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