optimize scan resolve lock

Signed-off-by: birdstorm <samuelwyf@hotmail.com>

Author: birdstorm

tikv-client/scripts/proto.sh

@@ -18,7 +18,7 @@ CURRENT_DIR=`pwd`
 TISPARK_HOME="$(cd "`dirname "$0"`"/../..; pwd)"
 cd $TISPARK_HOME/tikv-client
 
-kvproto_hash=6ed99a08e262d8a32d6355dcba91cf99cb92074a
+kvproto_hash=5dfa7b1325a3bfc07100eb2bcde655950122fa25
 
 raft_rs_hash=b9891b673573fad77ebcf9bbe0969cf945841926
 

tikv-client/src/main/java/com/pingcap/tikv/operation/KVErrorHandler.java

@@ -279,20 +279,22 @@ public boolean handleResponseError(BackOffer backOffer, RespT resp) {
     boolean retry = false;
 
     if (resp instanceof ScanResponse) {
-      List<KvPair> kvPairs = ((ScanResponse) resp).getPairsList();
-      List<Lock> locks = new ArrayList<>();
-      for (KvPair kvPair : kvPairs) {
-        if (kvPair.hasError()) {
-          Lock lock = AbstractLockResolverClient.extractLockFromKeyErr(kvPair.getError());
-          locks.add(lock);
+      if (((ScanResponse) resp).hasError()) {
+        List<KvPair> kvPairs = ((ScanResponse) resp).getPairsList();
+        List<Lock> locks = new ArrayList<>();
+        for (KvPair kvPair : kvPairs) {
+          if (kvPair.hasError()) {
+            Lock lock = AbstractLockResolverClient.extractLockFromKeyErr(kvPair.getError());
+            locks.add(lock);
+          }
         }
-      }
-      if (!locks.isEmpty()) {
-        try {
-          resolveLocks(backOffer, locks);
-          retry = true;
-        } catch (KeyException e) {
-          logger.warn("Unable to handle KeyExceptions other than LockException", e);
+        if (!locks.isEmpty()) {
+          try {
+            resolveLocks(backOffer, locks);
+            retry = true;
+          } catch (KeyException e) {
+            logger.warn("Unable to handle KeyExceptions other than LockException", e);
+          }
         }
       }
     } else {