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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] ThomasMarquardt commented on a change in pull request #2246: Hadoop-17215. ABFS: Disable default create overwrite
Date Wed, 16 Sep 2020 19:23:11 GMT

ThomasMarquardt commented on a change in pull request #2246:
URL: https://github.com/apache/hadoop/pull/2246#discussion_r489701120



##########
File path: hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/contracts/exceptions/ConcurrentWriteOperationDetectedException.java
##########
@@ -0,0 +1,32 @@
+/**
+ * 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.azurebfs.contracts.exceptions;
+
+/**
+ * Thrown when a concurrent write operation is detected.
+ */
+@org.apache.hadoop.classification.InterfaceAudience.Public
+@org.apache.hadoop.classification.InterfaceStability.Evolving
+public class ConcurrentWriteOperationDetectedException

Review comment:
       HDFS would simply acquire a lease and overwrite the file or fail to acquire the lease
and throw an IOException, so what we're really pointing out here is the need for Azure Blob
Storage to support lease atomically on file creation and for ABFS to use leases when writing
to files so that it can uphold the single writer semantics.  We knew this was needed from
the beginning but the work has not been done.




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