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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] snvijaya commented on a change in pull request #2246: Hadoop-17215. ABFS: Disable default create overwrite
Date Tue, 01 Sep 2020 08:34:23 GMT

snvijaya commented on a change in pull request #2246:
URL: https://github.com/apache/hadoop/pull/2246#discussion_r480967391



##########
File path: hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsClient.java
##########
@@ -271,10 +272,67 @@ public AbfsRestOperation deleteFilesystem() throws AzureBlobFileSystemException
     return op;
   }
 
-  public AbfsRestOperation createPath(final String path, final boolean isFile, final boolean
overwrite,
-                                      final String permission, final String umask,
-                                      final boolean isAppendBlob) throws AzureBlobFileSystemException
{
+  public AbfsRestOperation createPath(final String path,
+      final boolean isFile,
+      final boolean overwrite,
+      final String permission,
+      final String umask,
+      final boolean isAppendBlob) throws AzureBlobFileSystemException {
+    String operation = isFile
+        ? SASTokenProvider.CREATE_FILE_OPERATION
+        : SASTokenProvider.CREATE_DIRECTORY_OPERATION;
+
+    // HDFS FS defaults overwrite behaviour to true for create file which leads
+    // to majority create API traffic with overwrite=true. In some cases, this
+    // will end in race conditions at backend with parallel operations issued to
+    // same path either by means of the customer workload or ABFS driver retry.
+    // Disabling the create overwrite default setting to false should
+    // significantly reduce the chances for such race conditions.
+    boolean isFirstAttemptToCreateWithoutOverwrite = false;
+    if (isFile && overwrite
+        && abfsConfiguration.isDefaultCreateOverwriteDisabled()) {
+      isFirstAttemptToCreateWithoutOverwrite = true;
+    }
+
+    AbfsRestOperation op = null;
+    // Query builder
+    final AbfsUriQueryBuilder abfsUriQueryBuilder = createDefaultUriQueryBuilder();
+    abfsUriQueryBuilder.addQuery(QUERY_PARAM_RESOURCE,
+        operation.equals(SASTokenProvider.CREATE_FILE_OPERATION)
+            ? FILE
+            : DIRECTORY);
+    if (isAppendBlob) {
+      abfsUriQueryBuilder.addQuery(QUERY_PARAM_BLOBTYPE, APPEND_BLOB_TYPE);
+    }
+
+    appendSASTokenToQuery(path, operation, abfsUriQueryBuilder);
+
+    try {
+      op = createPathImpl(path, abfsUriQueryBuilder,
+          (isFirstAttemptToCreateWithoutOverwrite ? false : overwrite),
+          permission, umask);
+    } catch (AbfsRestOperationException e) {
+      if ((e.getStatusCode() == HttpURLConnection.HTTP_CONFLICT)

Review comment:
       In the driver code, we try to maintain all checks with HTTP status code. HTTP_CONFLICT
is possible only for operation on an already existing target.




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