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https://issues.apache.org/jira/browse/HDFS-3924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13454444#comment-13454444
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Aaron T. Myers commented on HDFS-3924:
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bq. Maybe we don't care about wire compatibility, but if so we should
explicitly state that we don't care.
We don't care in this case because this code has never been released.
> Multi-byte id in HdfsVolumeId
> -----------------------------
>
> Key: HDFS-3924
> URL: https://issues.apache.org/jira/browse/HDFS-3924
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 2.0.3-alpha
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-3924-1.patch
>
>
> Currently, the {{id}} in {{HdfsVolumeId}} is just a single byte. It'd be nice
> to make this larger, for situations where there's a large number of disks.
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