From e2ab829b95b3287c2ebf5195a93df4c38a2c89f1 Mon Sep 17 00:00:00 2001
From: Bo Cui <cuibo0108@163.com>
Date: Sat, 8 Aug 2020 08:58:45 +0800
Subject: [PATCH] HBASE-21721 reduce write#syncs() times

---
 .../java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
index 8ca6db4b35c5..cdebe554752a 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
@@ -635,8 +635,12 @@ public void run() {
           Throwable lastException = null;
           try {
             TraceUtil.addTimelineAnnotation("syncing writer");
+            long unSyncedFlushSeq = highestUnsyncedTxid;
             writer.sync(sf.isForceSync());
             TraceUtil.addTimelineAnnotation("writer synced");
+            if (unSyncedFlushSeq > currentSequence) {
+              currentSequence = unSyncedFlushSeq;
+            }
             currentSequence = updateHighestSyncedSequence(currentSequence);
           } catch (IOException e) {
             LOG.error("Error syncing, request close of WAL", e);