HBASE-28743 Fixes NPE for TableSnapshotScanner by disabling mslab (apache#6110)

Signed-off-by: Duo Zhang <[email protected]>
Signed-off-by: Viraj Jasani <[email protected]>
Signed-off-by: Pankaj Kumar <[email protected]>
(cherry picked from commit c264299)
Signed-off-by: apoonia <[email protected]>

Author: vineet4008

hbase-server/src/main/java/org/apache/hadoop/hbase/client/TableSnapshotScanner.java

@@ -26,6 +26,7 @@
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.PrivateCellUtil;
+import org.apache.hadoop.hbase.regionserver.MemStoreLAB;
 import org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper;
 import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;
 import org.apache.hadoop.hbase.snapshot.SnapshotManifest;
@@ -122,6 +123,7 @@ public TableSnapshotScanner(Configuration conf, Path rootDir, Path restoreDir,
     this.scan = scan;
     this.snapshotAlreadyRestored = snapshotAlreadyRestored;
     this.fs = rootDir.getFileSystem(conf);
+    conf.setBoolean(MemStoreLAB.USEMSLAB_KEY, false);
 
     if (snapshotAlreadyRestored) {
       this.restoreDir = restoreDir;