[jira] [Updated] (HADOOP-17038) Support positional read in AbfsInputStream

["Anoop Sam John (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-17038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anoop Sam John updated HADOOP-17038:
------------------------------------
    Attachment: HBase Perf Test Report.xlsx

> 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
>         Attachments: HBase Perf Test Report.xlsx
>
>
> 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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