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https://issues.apache.org/jira/browse/HDFS-6813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086007#comment-14086007
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Steve Loughran commented on HDFS-6813:
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Nicholas, can you look at HADOOP-10938 and see if we can pull this discussion
together.
For HBase they are looking at what could be done for concurrent HDFS
operations, that is what can be relaxed/unrelaxed.
The native IO streams are all generally wrapped by RawLocal and checksummed
filesystems, so they get their sync semantics from there.
What we do have, however is a model in which {{getPos() }} can block until a
potentially remote, long-haul IO operation completes, which I think is an
anomaly.
> WebHdfsFileSystem#OffsetUrlInputStream should implement PositionedReadable
> with thead-safe.
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-6813
> URL: https://issues.apache.org/jira/browse/HDFS-6813
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 2.6.0
> Reporter: Yi Liu
> Assignee: Yi Liu
> Attachments: HDFS-6813.001.patch
>
>
> {{PositionedReadable}} definition requires the implementations for its
> interfaces should be thread-safe.
> OffsetUrlInputStream(WebHdfsFileSystem inputstream) doesn't implement these
> interfaces with tread-safe, this JIRA is to fix this.
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