如果您知道 hadoop 集群名称节点,那么您可以尝试 ping 它们或发送如下所示的 curl 请求
curl 'http://my-namenode-lv-101:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus'
{
"beans" : [ {
"name" : "Hadoop:service=NameNode,name=NameNodeStatus",
"modelerType" : "org.apache.hadoop.hdfs.server.namenode.NameNode",
"SecurityEnabled" : false,
"NNRole" : "NameNode",
"HostAndPort" : "my-namenode-lv-101:8020",
"LastHATransitionTime" : 1561605051455,
"State" : "standby"
} ]
}
如果状态是Standby,那么就是当前的非活动节点,你必须尝试其他节点来找到State为“活动”的节点......示例如下:
curl 'http://my-namenode-lv-102:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus'
{
"beans" : [ {
"name" : "Hadoop:service=NameNode,name=NameNodeStatus",
"modelerType" : "org.apache.hadoop.hdfs.server.namenode.NameNode",
"State" : "active",
"SecurityEnabled" : false,
"NNRole" : "NameNode",
"HostAndPort" : "my-namenode-lv-102:8020",
"LastHATransitionTime" : 1561605054944
} ]
}