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https://issues.apache.org/jira/browse/HADOOP-15245?focusedWorklogId=714984&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-714984
]
ASF GitHub Bot logged work on HADOOP-15245:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Jan/22 17:03
Start Date: 25/Jan/22 17:03
Worklog Time Spent: 10m
Work Description: ahmarsuhail opened a new pull request #3927:
URL: https://github.com/apache/hadoop/pull/3927
### Description of PR
Implements an optimised skip() that calls lazySeek which will decided when
to do a default skip vs do a new get. Also adds in instrumentation to count
number of times skip is called.
### How was this patch tested?
Tested in eu-west-1 by running
```
mvn -Dparallel-tests -DtestsThreadCount=16 clean verify
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 714984)
Time Spent: 20m (was: 10m)
> S3AInputStream.skip() to use lazy seek
> --------------------------------------
>
> Key: HADOOP-15245
> URL: https://issues.apache.org/jira/browse/HADOOP-15245
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.1.0
> Reporter: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> the default skip() does a read and discard of all bytes, no matter how far
> ahead the skip is. This is very inefficient if the skip() is being done on
> S3A random IO, though exactly what to do when in sequential mode.
> Proposed:
> * add an optimized version of S3AInputStream.skip() which does a lazy seek,
> which itself will decided when to skip() vs issue a new GET.
> * add some more instrumentation to measure how often this gets used
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