[bookkeeper] branch master updated: Add static declaration for useFallocate in DirectWriter (#3388)

[chenhang]

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chenhang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/bookkeeper.git


The following commit(s) were added to refs/heads/master by this push:
     new 988b92d9d3 Add static declaration for useFallocate in DirectWriter 
(#3388)
988b92d9d3 is described below

commit 988b92d9d3364513dd3857b89a95f515b99d4e87
Author: wenbingshen <oliver.shen...@gmail.com>
AuthorDate: Wed Jul 13 22:37:27 2022 +0800

    Add static declaration for useFallocate in DirectWriter (#3388)
    
    ### Motivation
    
    The work of the `BP-47` has been very meaningful. I am reading and learning 
it.
    
    As the title, `useFallocate` in `DirectWriter` has no practical meaning, 
because the judgment of SystemUtils.IS_OS_LINUX always happens.
---
 .../bookie/storage/directentrylogger/DirectWriter.java         | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/directentrylogger/DirectWriter.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/directentrylogger/DirectWriter.java
index 13cd7c34f2..d441fb0340 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/directentrylogger/DirectWriter.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/directentrylogger/DirectWriter.java
@@ -49,7 +49,7 @@ class DirectWriter implements LogWriter {
     final List<Future<?>> outstandingWrites = new ArrayList<Future<?>>();
     Buffer nativeBuffer;
     long offset;
-    private volatile boolean useFallocate = true;
+    private static volatile boolean useFallocate = true;
 
     DirectWriter(int id,
                  String filename,
@@ -77,7 +77,7 @@ class DirectWriter implements LogWriter {
 
         if (useFallocate) {
             if (!SystemUtils.IS_OS_LINUX) {
-                useFallocate = false;
+                disableUseFallocate();
                 slog.warn(Events.FALLOCATE_NOT_AVAILABLE);
             } else {
                 try {
@@ -86,7 +86,7 @@ class DirectWriter implements LogWriter {
                 } catch (NativeIOException ex) {
                     // fallocate(2) is not supported on all filesystems.  
Since this is an optimization, disable
                     // subsequent usage instead of failing the operation.
-                    useFallocate = false;
+                    disableUseFallocate();
                     slog.kv("message", ex.getMessage())
                         .kv("file", filename)
                         .kv("errno", ex.getErrno())
@@ -99,6 +99,10 @@ class DirectWriter implements LogWriter {
         this.nativeBuffer = bufferPool.acquire();
     }
 
+    private static void disableUseFallocate() {
+        DirectWriter.useFallocate = false;
+    }
+
     @Override
     public int logId() {
         return id;