From 31d7d470709555cbee14f0fdf59b9e15c3c02ff1 Mon Sep 17 00:00:00 2001
From: Yongjun Zhang <yzhang@cloudera.com>
Date: Fri, 21 Apr 2017 13:36:31 -0700
Subject: [PATCH] HDFS-11689. New exception thrown by
 DFSClient%isHDFSEncryptionEnabled broke hacky hive code. Contributed by
 Yongjun Zhang.

(cherry picked from commit 5078df7be317e635615c05c5da3285798993ff1f)
---
 .../java/org/apache/hadoop/hdfs/DFSClient.java | 18 ++++++++++++++++--
 .../hadoop/hdfs/DistributedFileSystem.java     |  8 +-------
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
index ca82df83462..07f5e78f806 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
@@ -3067,10 +3067,24 @@ public void setKeyProvider(KeyProvider provider) {
 
   /**
    * Probe for encryption enabled on this filesystem.
+   * Note (see HDFS-11689):
+   * Not to throw exception in this method since it would break hive.
+   * Hive accesses this method and assumes no exception would be thrown.
+   * Hive should not access DFSClient since it is InterfaceAudience.Private.
+   * Deprecated annotation is added to trigger build warning at hive side.
+   * Request has been made to Hive to remove access to DFSClient.
    * @return true if encryption is enabled
    */
-  public boolean isHDFSEncryptionEnabled() throws IOException{
-    return getKeyProviderUri() != null;
+  @Deprecated
+  public boolean isHDFSEncryptionEnabled() {
+    boolean result = false;
+    try {
+      result = (getKeyProviderUri() != null);
+    } catch (IOException ioe) {
+      DFSClient.LOG.warn("Exception while checking whether encryption zone "
+            + "is supported, assumes it is not supported", ioe);
+    }
+    return result;
   }
 
   /**
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
index 4caf04f82b7..fd45406400c 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
@@ -2520,13 +2520,7 @@ public DFSInotifyEventInputStream getInotifyEventStream(long lastReadTxid)
    */
   @Override
   public Path getTrashRoot(Path path) {
-    try {
-      if ((path == null) || !dfs.isHDFSEncryptionEnabled()) {
-        return super.getTrashRoot(path);
-      }
-    } catch (IOException ioe) {
-      DFSClient.LOG.warn("Exception while checking whether encryption zone is "
-          + "supported", ioe);
+    if ((path == null) || !dfs.isHDFSEncryptionEnabled()) {
       return super.getTrashRoot(path);
     }