(orc) branch branch-2.0 updated: ORC-1600: Reduce getStaticMemoryManager sync block in OrcFile

[dongjoon]

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

dongjoon pushed a commit to branch branch-2.0
in repository https://gitbox.apache.org/repos/asf/orc.git


The following commit(s) were added to refs/heads/branch-2.0 by this push:
     new ecfd17ae8 ORC-1600: Reduce getStaticMemoryManager sync block in OrcFile
ecfd17ae8 is described below

commit ecfd17ae8d995ce06958b53b1ffca9bccc9097a8
Author: sychen <syc...@ctrip.com>
AuthorDate: Mon Jan 22 10:50:02 2024 -0800

    ORC-1600: Reduce getStaticMemoryManager sync block in OrcFile
    
    ### What changes were proposed in this pull request?
    Improve calling efficiency of 
`org.apache.orc.OrcFile#getStaticMemoryManager`.
    
    ### Why are the changes needed?
    `org.apache.orc.OrcFile#getStaticMemoryManager` is a static method with 
synchronized. It needs to be locked every time it is called. This is 
unnecessary.
    
    ### How was this patch tested?
    GA
    
    ### Was this patch authored or co-authored using generative AI tooling?
    No
    
    Closes #1768 from cxzl25/ORC-1600.
    
    Authored-by: sychen <syc...@ctrip.com>
    Signed-off-by: Dongjoon Hyun <dongj...@apache.org>
    (cherry picked from commit b5c2250f1e89629a1ce7d398e3567ea0713fd8cb)
    Signed-off-by: Dongjoon Hyun <dongj...@apache.org>
---
 java/core/src/java/org/apache/orc/OrcFile.java | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/java/core/src/java/org/apache/orc/OrcFile.java 
b/java/core/src/java/org/apache/orc/OrcFile.java
index dfe3088fb..86444868b 100644
--- a/java/core/src/java/org/apache/orc/OrcFile.java
+++ b/java/core/src/java/org/apache/orc/OrcFile.java
@@ -1044,11 +1044,15 @@ public class OrcFile {
     return new WriterOptions(tableProperties, conf);
   }
 
-  private static MemoryManager memoryManager = null;
+  private static volatile MemoryManager memoryManager = null;
 
-  private static synchronized MemoryManager 
getStaticMemoryManager(Configuration conf) {
+  private static MemoryManager getStaticMemoryManager(Configuration conf) {
     if (memoryManager == null) {
-      memoryManager = new MemoryManagerImpl(conf);
+      synchronized (OrcFile.class) {
+        if (memoryManager == null) {
+          memoryManager = new MemoryManagerImpl(conf);
+        }
+      }
     }
     return memoryManager;
   }