From 72932ad0df32859c9492b8f313c4a79a7e85bfd0 Mon Sep 17 00:00:00 2001
From: Gaurav Kanade <gaurav.kanade@gmail.com>
Date: Thu, 23 Jul 2020 10:25:33 +0530
Subject: [PATCH] null check for writer if not initialized yet during
 syncrunner run

---
 .../org/apache/hadoop/hbase/regionserver/wal/FSHLog.java  | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

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 9a4887da4ea..65bac01ba87 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
@@ -594,9 +594,11 @@ public class FSHLog extends AbstractFSWAL<Writer> {
           long start = System.nanoTime();
           Throwable lastException = null;
           try {
-            TraceUtil.addTimelineAnnotation("syncing writer");
-            writer.sync(sf.isForceSync());
-            TraceUtil.addTimelineAnnotation("writer synced");
+            if(writer != null) {
+              TraceUtil.addTimelineAnnotation("syncing writer");
+              writer.sync(sf.isForceSync());
+              TraceUtil.addTimelineAnnotation("writer synced");
+            }
             currentSequence = updateHighestSyncedSequence(currentSequence);
           } catch (IOException e) {
             LOG.error("Error syncing, request close of WAL", e);