HBASE-23334 The table-lock node of zk is not needed since HBASE-16786 (apache#873)

Signed-off-by: Guangxu Cheng <gxcheng@apache.org>

Author: bsglz

hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZNodePaths.java

@@ -74,8 +74,6 @@ public class ZNodePaths {
   public final String regionNormalizerZNode;
   // znode containing the state of all switches, currently there are split and merge child node.
   public final String switchZNode;
-  // znode containing the lock for the tables
-  public final String tableLockZNode;
   // znode containing namespace descriptors
   public final String namespaceZNode;
   // znode of indicating master maintenance mode
@@ -113,7 +111,6 @@ public ZNodePaths(Configuration conf) {
     regionNormalizerZNode =
         joinZNode(baseZNode, conf.get("zookeeper.znode.regionNormalizer", "normalizer"));
     switchZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.switch", "switch"));
-    tableLockZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.tableLock", "table-lock"));
     namespaceZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.namespace", "namespace"));
     masterMaintZNode =
         joinZNode(baseZNode, conf.get("zookeeper.znode.masterMaintenance", "master-maintenance"));
@@ -127,16 +124,27 @@ public ZNodePaths(Configuration conf) {
 
   @Override
   public String toString() {
-    return "ZNodePaths [baseZNode=" + baseZNode + ", metaReplicaZNodes=" + metaReplicaZNodes
-        + ", rsZNode=" + rsZNode + ", drainingZNode=" + drainingZNode + ", masterAddressZNode="
-        + masterAddressZNode + ", backupMasterAddressesZNode=" + backupMasterAddressesZNode
-        + ", clusterStateZNode=" + clusterStateZNode + ", tableZNode=" + tableZNode
-        + ", clusterIdZNode=" + clusterIdZNode + ", splitLogZNode=" + splitLogZNode
-        + ", balancerZNode=" + balancerZNode + ", regionNormalizerZNode=" + regionNormalizerZNode
-        + ", switchZNode=" + switchZNode + ", tableLockZNode=" + tableLockZNode
-        + ", namespaceZNode=" + namespaceZNode + ", masterMaintZNode=" + masterMaintZNode
-        + ", replicationZNode=" + replicationZNode + ", peersZNode=" + peersZNode
-        + ", queuesZNode=" + queuesZNode + ", hfileRefsZNode=" + hfileRefsZNode + "]";
+    return new StringBuilder()
+        .append("ZNodePaths [baseZNode=").append(baseZNode)
+        .append(", metaReplicaZNodes=").append(metaReplicaZNodes)
+        .append(", rsZNode=").append(rsZNode)
+        .append(", drainingZNode=").append(drainingZNode)
+        .append(", masterAddressZNode=").append(masterAddressZNode)
+        .append(", backupMasterAddressesZNode=").append(backupMasterAddressesZNode)
+        .append(", clusterStateZNode=").append(clusterStateZNode)
+        .append(", tableZNode=").append(tableZNode)
+        .append(", clusterIdZNode=").append(clusterIdZNode)
+        .append(", splitLogZNode=").append(splitLogZNode)
+        .append(", balancerZNode=").append(balancerZNode)
+        .append(", regionNormalizerZNode=").append(regionNormalizerZNode)
+        .append(", switchZNode=").append(switchZNode)
+        .append(", namespaceZNode=").append(namespaceZNode)
+        .append(", masterMaintZNode=").append(masterMaintZNode)
+        .append(", replicationZNode=").append(replicationZNode)
+        .append(", peersZNode=").append(peersZNode)
+        .append(", queuesZNode=").append(queuesZNode)
+        .append(", hfileRefsZNode=").append(hfileRefsZNode)
+        .append("]").toString();
   }
 
   /**

hbase-client/src/test/java/org/apache/hadoop/hbase/zookeeper/TestZNodePaths.java

@@ -46,7 +46,6 @@ public void testIsClientReadable() {
     assertTrue(znodePaths.isClientReadable(ZNodePaths.joinZNode(znodePaths.tableZNode, "foo")));
     assertTrue(znodePaths.isClientReadable(znodePaths.rsZNode));
 
-    assertFalse(znodePaths.isClientReadable(znodePaths.tableLockZNode));
     assertFalse(znodePaths.isClientReadable(znodePaths.balancerZNode));
     assertFalse(znodePaths.isClientReadable(znodePaths.regionNormalizerZNode));
     assertFalse(znodePaths.isClientReadable(znodePaths.clusterStateZNode));

hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKWatcher.java

@@ -186,7 +186,6 @@ private void createBaseZNodes() throws ZooKeeperConnectionException {
       ZKUtil.createAndFailSilent(this, znodePaths.tableZNode);
       ZKUtil.createAndFailSilent(this, znodePaths.splitLogZNode);
       ZKUtil.createAndFailSilent(this, znodePaths.backupMasterAddressesZNode);
-      ZKUtil.createAndFailSilent(this, znodePaths.tableLockZNode);
       ZKUtil.createAndFailSilent(this, znodePaths.masterMaintZNode);
     } catch (KeeperException e) {
       throw new ZooKeeperConnectionException(