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https://issues.apache.org/jira/browse/HDFS-8901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15466024#comment-15466024
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SammiChen commented on HDFS-8901:
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1. Run {{hadoop.net.TestDNS}} locally, it passed without any failure. Also the
patch is irrelevant to DNS.
2. The reported checkstyle issue seems a false alert.
> Use ByteBuffer in striping positional read
> ------------------------------------------
>
> Key: HDFS-8901
> URL: https://issues.apache.org/jira/browse/HDFS-8901
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: SammiChen
> Attachments: HDFS-8901-v10.patch, HDFS-8901-v17.patch,
> HDFS-8901-v18.patch, HDFS-8901-v19.patch, HDFS-8901-v2.patch,
> HDFS-8901-v20.patch, HDFS-8901-v3.patch, HDFS-8901-v4.patch,
> HDFS-8901-v5.patch, HDFS-8901-v6.patch, HDFS-8901-v7.patch,
> HDFS-8901-v8.patch, HDFS-8901-v9.patch, HDFS-8901.v11.patch,
> HDFS-8901.v12.patch, HDFS-8901.v13.patch, HDFS-8901.v14.patch,
> HDFS-8901.v15.patch, HDFS-8901.v16.patch, initial-poc.patch
>
>
> Native erasure coder prefers to direct ByteBuffer for performance
> consideration. To prepare for it, this change uses ByteBuffer through the
> codes in implementing striping position read. It will also fix avoiding
> unnecessary data copying between striping read chunk buffers and decode input
> buffers.
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