[hadoop] 02/06: HADOOP-16578 : Avoid FileSystem API calls when FileSystem already exists

[dazhou]

This is an automated email from the ASF dual-hosted git repository.

dazhou pushed a commit to branch branch-3.2
in repository https://gitbox.apache.org/repos/asf/hadoop.git

commit 8b2c7e0c4d87eb792c573b16e3721e5e4020752f
Author: Sneha Vijayarajan <sneha.vijayara...@gmail.com>
AuthorDate: Tue Oct 1 17:38:11 2019 -0700

    HADOOP-16578 : Avoid FileSystem API calls when FileSystem already exists
---
 .../java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java     | 3 ++-
 .../org/apache/hadoop/fs/azurebfs/ITestGetNameSpaceEnabled.java     | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git 
a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java
 
b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java
index 1663ed9..82a38a2 100644
--- 
a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java
+++ 
b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java
@@ -55,6 +55,7 @@ import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PathIOException;
+import org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants;
 import org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations;
 import org.apache.hadoop.fs.azurebfs.constants.FileSystemUriSchemes;
 import 
org.apache.hadoop.fs.azurebfs.contracts.exceptions.AbfsRestOperationException;
@@ -107,7 +108,7 @@ public class AzureBlobFileSystem extends FileSystem {
     this.setWorkingDirectory(this.getHomeDirectory());
 
     if (abfsConfiguration.getCreateRemoteFileSystemDuringInitialization()) {
-      if (!this.fileSystemExists()) {
+      if (this.tryGetFileStatus(new Path(AbfsHttpConstants.ROOT_PATH)) == 
null) {
         try {
           this.createFileSystem();
         } catch (AzureBlobFileSystemException ex) {
diff --git 
a/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestGetNameSpaceEnabled.java
 
b/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestGetNameSpaceEnabled.java
index b9a2315..74c8803 100644
--- 
a/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestGetNameSpaceEnabled.java
+++ 
b/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestGetNameSpaceEnabled.java
@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.fs.azurebfs;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.UUID;
 
@@ -24,6 +25,7 @@ import org.junit.Assume;
 import org.junit.Test;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
 import 
org.apache.hadoop.fs.azurebfs.contracts.exceptions.AbfsRestOperationException;
 import org.apache.hadoop.fs.azurebfs.services.AuthType;
 
@@ -67,10 +69,10 @@ public class ITestGetNameSpaceEnabled extends 
AbstractAbfsIntegrationTest {
             + testUri.substring(testUri.indexOf("@"));
     AzureBlobFileSystem fs = this.getFileSystem(nonExistingFsUrl);
 
-    intercept(AbfsRestOperationException.class,
+    intercept(FileNotFoundException.class,
             "\"The specified filesystem does not exist.\", 404",
             ()-> {
-              fs.getIsNamespaceEnabled();
+              fs.getFileStatus(new Path("/")); // Run a dummy FS call
             });
   }
 


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