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https://issues.apache.org/jira/browse/HADOOP-19161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17844398#comment-17844398
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Steve Loughran commented on HADOOP-19161:
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HADOOP-18544 is the delete optimisation. we know this is very brittle so could
maybe split
delete-no-parent-recreate
so distinguish from any future delete optimisations, such as skipping a LIST
for delete(recursive=false)
> S3A: option "fs.s3a.performance.flags" to take list of performance flags
> ------------------------------------------------------------------------
>
> Key: HADOOP-19161
> URL: https://issues.apache.org/jira/browse/HADOOP-19161
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/s3
> Affects Versions: 3.4.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
>
> HADOOP-19072 shows we want to add more optimisations than that of
> HADOOP-18930.
> * Extending the new optimisations to the existing option is brittle
> * Adding explicit options for each feature gets complext fast.
> Proposed
> * A new class S3APerformanceFlags keeps all the flags
> * it build this from a string[] of values, which can be extracted from
> getConf(),
> * and it can also support a "*" option to mean "everything"
> * this class can also be handed off to hasPathCapability() and do the right
> thing.
> Proposed optimisations
> * create file (we will hook up HADOOP-18930)
> * mkdir (HADOOP-19072)
> * delete (probe for parent path)
> * rename (probe for source path)
> We could think of more, with different names, later.
> The goal is make it possible to strip out every HTTP request we do for
> safety/posix compliance, so applications have the option of turning off what
> they don't need.
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