[
https://issues.apache.org/jira/browse/HADOOP-16721?focusedWorklogId=563632&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-563632
]
ASF GitHub Bot logged work on HADOOP-16721:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 10/Mar/21 10:34
Start Date: 10/Mar/21 10:34
Worklog Time Spent: 10m
Work Description: steveloughran commented on a change in pull request
#2742:
URL: https://github.com/apache/hadoop/pull/2742#discussion_r591334439
##########
File path:
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/impl/ITestRenameDeleteRace.java
##########
@@ -0,0 +1,248 @@
+/*
+ * 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.io.IOException;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
+
+import com.amazonaws.AmazonClientException;
+import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListeningExecutorService;
Review comment:
gotcha. Can we add some style checking to block this?
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Issue Time Tracking
-------------------
Worklog Id: (was: 563632)
Time Spent: 2h 20m (was: 2h 10m)
> Improve S3A rename resilience
> -----------------------------
>
> Key: HADOOP-16721
> URL: https://issues.apache.org/jira/browse/HADOOP-16721
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.2.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Blocker
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> h3. race condition in delete/rename overlap
> If you have multiple threads on a system doing rename operations, then one
> thread doing a delete(dest/subdir) may delete the last file under a subdir,
> and, before its listed and recreated any parent dir marker -other threads may
> conclude there's an empty dest dir and fail.
> This is most likely on an overloaded system with many threads executing
> rename operations, as with parallel copying taking place there are many
> threads to schedule and https connections to pool.
> h3. failure reporting
> the classic \{[rename(source, dest)}} operation returns \{{false}} on certain
> failures, which, while somewhat consistent with the posix APIs, turns out to
> be useless for identifying the cause of problems. Applications tend to have
> code which goes
> {code}
> if (!fs.rename(src, dest)) throw new IOException("rename failed");
> {code}
> While ultimately the rename/3 call needs to be made public (HADOOP-11452) it
> would then need a adoption across applications. We can do this in the hadoop
> modules, but for Hive, Spark etc it will take along time.
> Proposed: a switch to tell S3A to stop downgrading certain failures (source
> is dir, dest is file, src==dest, etc) into "false". This can be turned on
> when trying to diagnose why things like Hive are failing.
> Production code: trivial
> * change in rename(),
> * new option
> * docs.
> Test code:
> * need to clear this option for rename contract tests
> * need to create a new FS with this set to verify the various failure modes
> trigger it.
>
> If this works we should do the same for ABFS, GCS. Hey, maybe even HDFS
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