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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HADOOP-17038) Support positional read in AbfsInputStream
Date Thu, 03 Sep 2020 18:32:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-17038?focusedWorklogId=478751&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-478751
]

ASF GitHub Bot logged work on HADOOP-17038:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Sep/20 18:31
            Start Date: 03/Sep/20 18:31
    Worklog Time Spent: 10m 
      Work Description: steveloughran commented on pull request #2206:
URL: https://github.com/apache/hadoop/pull/2206#issuecomment-686672349


   >  The Keys for the FSBuilder APIs needs to be generic. Any pointer where we need to
add this? May be already we have a place for this with sample keys .. Wanted to see the naming
convention. I can refer that. Thanks again Steve.
   
   Have a look at what I'm doing in #2168 for this.


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 478751)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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, screenshot-1.png
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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