ZNodeClearer#clear() throws IllegalArgumentException

Precondition:

hbase.balancer.tablesOnMaster = true

hbase.balancer.tablesOnMaster.systemTablesOnly = true

In case of master-rs collocation HBASE_ZNODE_FILE is overwritten by regionserver process in HRegionServer#handleReportForDutyResponse() here is how it looks on master server:

[hadoop@master-node data]$ cat hbase-hadoop-master.znode

/hbase/rs/master-node,16000,1578371505720

When ZNodeClearer#clear(), the rsZNode is also splicing with the contents of the file, causing an exception：

java.lang.IllegalArgumentException: Invalid path string "/hbase/rs//hbase/rs/master-node,16000,1578371503003" caused by empty node name specified @10

        at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:99)

        at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:851)

        at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.delete(RecoverableZooKeeper.java:166)

        at org.apache.hadoop.hbase.zookeeper.ZKUtil.deleteNodeFailSilent(ZKUtil.java:1259)

        at org.apache.hadoop.hbase.zookeeper.ZKUtil.deleteNodeFailSilent(ZKUtil.java:1251)

        at org.apache.hadoop.hbase.ZNodeClearer.clear(ZNodeClearer.java:188)

        at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:144)

        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)

        at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)

        at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:3117)