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https://issues.apache.org/jira/browse/HADOOP-19161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17868392#comment-17868392
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ASF GitHub Bot commented on HADOOP-19161:
-----------------------------------------
steveloughran commented on code in PR #6789:
URL: https://github.com/apache/hadoop/pull/6789#discussion_r1689944706
##########
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/performance.md:
##########
@@ -276,7 +283,45 @@ Fix: Use one of the dedicated [S3A
Committers](committers.md).
## <a name="tuning"></a> Options to Tune
-### <a name="pooling"></a> Thread and connection pool settings.
+### <a name="flags"></a> Performance Flags: `fs.s3a.performance.flag`
+
+This option takes a comma separated list of performance flags.
+View it as the equivalent of the `-O` compiler optimization list C/C++
compilers offer.
+That is a complicated list of options which deliver speed if the person
setting them
+understands the risks.
Review Comment:
no, its an individual who takes the blame
##########
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/performance.md:
##########
@@ -276,7 +283,45 @@ Fix: Use one of the dedicated [S3A
Committers](committers.md).
## <a name="tuning"></a> Options to Tune
-### <a name="pooling"></a> Thread and connection pool settings.
+### <a name="flags"></a> Performance Flags: `fs.s3a.performance.flag`
+
+This option takes a comma separated list of performance flags.
+View it as the equivalent of the `-O` compiler optimization list C/C++
compilers offer.
+That is a complicated list of options which deliver speed if the person
setting them
+understands the risks.
+
+* The list of flags MAY change across releases
+* The semantics of specific flags SHOULD NOT change across releases.
+* If an option is to be tuned which may relax semantics, a new option MUST be
defined.
+* Unknown flags are ignored; this is to avoid compatibility.
+* The option `*` means "turn everything on". This is implicitly unstable
across releases.
+
+| *Option* | *Meaning* | Since |
+|----------|--------------------|:------|
+| `create` | Create Performance | 3.4.1 |
Review Comment:
no
> 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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