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https://issues.apache.org/jira/browse/HBASE-22005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16786813#comment-16786813
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Steve Loughran commented on HBASE-22005:
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A lot of filesystems don't implement the byte buffer operations, not just
through laziness but because if the underlying APIs used for data just work at
the stream level (e.g. all the http clients), its pretty suboptimal to try:
we'd be streaming into a byte buffer, the app would be pulling out thinking
they were getting a performance boost when they weren't etc.
See HADOOP-11867 for some discussion of this.
I'll accept a patch to let you use the StreamCapabilities to query all the way
through a wrapped input stream to see if the feature is available, and once
HADOOP-15691 is in, a check on a filesystem before even opening a file. This
should let you decide when to switch to ByteBuffers.
> Use ByteBuff's refcnt to track the life cycle of data block
> -----------------------------------------------------------
>
> Key: HBASE-22005
> URL: https://issues.apache.org/jira/browse/HBASE-22005
> Project: HBase
> Issue Type: Sub-task
> Reporter: Zheng Hu
> Assignee: Zheng Hu
> Priority: Major
> Attachments: HBASE-22005.HBASE-21879.v1.patch
>
>
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