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https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620027#comment-13620027
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Colin Patrick McCabe commented on HDFS-4538:
--------------------------------------------
{{dfs.client.use.legacy.blockreader.local}} causes us to use the legacy
{{BlockReaderLocal}}. This is similar to how
{{dfs.client.use.legacy.blockreader}} works.
> 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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