From 11cfb0f38290be2cdbca5b0b74fbcbb1af3be15c Mon Sep 17 00:00:00 2001
From: Bo Cui <cuibo0108@163.com>
Date: Sat, 8 Aug 2020 12:09:48 +0800
Subject: [PATCH] HBASE-21721 FSHLog : reduce write#syncs() times (#2217)

Signed-off-by: stack <stack@apache.org>
Signed-off-by: Anoop <anoopsamjohn@apache.org>
---
 .../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 8fb8e83e00f..fb2abfaa45e 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
@@ -636,8 +636,12 @@ public class FSHLog extends AbstractFSWAL<Writer> {
           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);