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https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-4538:
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Attachment: HDFS-4538.003.patch
* Enable both regular and legacy short-circuit local reads, and verify that
legacy takes priority. We do this by removing the socket path, which would
cause the regular SCR path to fail (when combined with
{{DFSInputStream.tcpReadsDisabledForTesting}}).
* DomainSocketFactory: don't create domain sockets for SCR if the legacy block
reader is enabled.
* BlockReaderFactory: don't create a new-style BlockReaderLocal when
BlockReaderLocalLegacy is enabled.
* don't log warnings about SCR being disabled due to a bad socket path, if it
is in fact enabled due to the legacy SCR being turned on.
> 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
>
>
> 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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