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https://issues.apache.org/jira/browse/HADOOP-19161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843233#comment-17843233
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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_r1589313816
##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/S3APerformanceFlags.java:
##########
@@ -0,0 +1,166 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.s3a.impl;
+
+import java.util.Locale;
+
+import org.apache.hadoop.fs.StreamCapabilities;
+
+import static
org.apache.hadoop.fs.s3a.Constants.FS_S3A_CREATE_PERFORMANCE_ENABLED;
+import static org.apache.hadoop.fs.s3a.Constants.FS_S3A_PERFORMANCE_FLAGS;
+
+/**
+ * Performance flags.
+ * These are stored as a map of options.
+ */
+public final class S3APerformanceFlags implements StreamCapabilities {
+
+ /**
+ * Flag for create performance: {@value}.
+ */
+ public static final String CREATE = "create";
+
+ /**
+ * Flag for delete performance: {@value}.
+ */
+ public static final String DELETE = "delete";
+
+ /**
+ * Flag for mkdir performance: {@value}.
+ */
+ public static final String MKDIR = "mkdir";
+
+ /**
+ * Enable all performance flags: {@value}.
+ */
+ public static final String ALL = "*";
+
+ /**
+ * Higher performance create operations.
+ */
+ private boolean create;
+
+ /**
+ * Delete operation to skip parent probe.
+ */
+ private boolean delete;
+
+ /**
+ * Mkdir to skip checking for type of parent paths.
+ */
+ private boolean mkdir;
+
+ public S3APerformanceFlags() {
+ }
+
+ public boolean isCreate() {
+ return create;
+ }
+
+ public boolean isDelete() {
+ return delete;
+ }
Review Comment:
yes. harshit did an experiment where he turned off all attempts at creating
parent dirs after delete. fairly brittle, i think
> 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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