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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/10/07 10:55:00 UTC
[jira] [Work logged] (HADOOP-17038) Support positional read in
AbfsInputStream
[ https://issues.apache.org/jira/browse/HADOOP-17038?focusedWorklogId=496490&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-496490 ]
ASF GitHub Bot logged work on HADOOP-17038:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 07/Oct/20 10:54
Start Date: 07/Oct/20 10:54
Worklog Time Spent: 10m
Work Description: anoopsjohn closed pull request #2206:
URL: https://github.com/apache/hadoop/pull/2206
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Issue Time Tracking
-------------------
Worklog Id: (was: 496490)
Time Spent: 20m (was: 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, pull-request-available
> Attachments: HBase Perf Test Report.xlsx, screenshot-1.png
>
> Time Spent: 20m
> 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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