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https://issues.apache.org/jira/browse/HADOOP-17038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17174116#comment-17174116
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Anoop Sam John commented on HADOOP-17038:
-----------------------------------------
Attached below is pert test done on an HBase cluster. This is a single
RegionServer cluster with 15 regions. Total data size is 100 GB.
Single client app with 10 or 100 threads doing the random row get ops. (Using
HBase's native PerformanceEvaluation Tool)
> Support positional read in AbfsInputStream
> ------------------------------------------
>
> Key: HADOOP-17038
> URL: https://issues.apache.org/jira/browse/HADOOP-17038
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Priority: Major
> Labels: HBase, abfsactive
>
> Right now it will do a seek to the position , read and then seek back to the
> old position. (As per the impl in the super class)
> In HBase kind of workloads we rely mostly on short preads. (like 64 KB size
> by default). So would be ideal to support a pure pos read API which will not
> even keep the data in a buffer but will only read the required data as what
> is asked for by the caller. (Not reading ahead more data as per the read size
> config)
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