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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/02/01 10:08:00 UTC
[jira] [Work logged] (HADOOP-17038) Support disabling buffered
reads in ABFS positional reads
[ https://issues.apache.org/jira/browse/HADOOP-17038?focusedWorklogId=545228&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-545228 ]
ASF GitHub Bot logged work on HADOOP-17038:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 01/Feb/21 10:07
Start Date: 01/Feb/21 10:07
Worklog Time Spent: 10m
Work Description: surendralilhore commented on a change in pull request #2646:
URL: https://github.com/apache/hadoop/pull/2646#discussion_r567700230
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File path: hadoop-tools/hadoop-azure/src/site/markdown/abfs.md
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@@ -812,6 +812,13 @@ aheads. Specify the value in bytes. The value should be between 16384 to
104857600 both inclusive (16 KB to 100 MB). The default value will be
4194304 (4 MB).
+`fs.azure.buffered.pread.disable`: By default the positional read API will do a
Review comment:
We can clearly mentioned here that, it is not a property and it's used as a option in FutureDataInputStreamBuilder.
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Issue Time Tracking
-------------------
Worklog Id: (was: 545228)
Time Spent: 2.5h (was: 2h 20m)
> Support disabling buffered reads in ABFS positional reads
> ---------------------------------------------------------
>
> 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: 2.5h
> 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)
> Allow an optional boolean config to be specified while opening file for read using which buffered pread can be disabled.
> FutureDataInputStreamBuilder openFile(Path path)
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