将节点添加到运行集群 elasticsearch 导致 master not found 异常

Question

问题

我有一个正在运行的集群，我想在其中添加一个数据节点。正在运行的集群是

x.x.x.246

数据节点是

x.x.x.99

每个服务器可以通过 ping 看到对方。 机器操作系统：CentOS7 弹性搜索：7.61

配置：

这里是 x.x.x.246 的 elasticsearch.yml：

cluster.name: elasticsearch
node.master: true
node.name: Node_master
node.data: true
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: x.x.x.246
http.port: 9200
discovery.seed_hosts: ["x.x.x.99:9300"]
cluster.initial_master_nodes: ["x.x.x.246:9300"]

这里是 x.x.x.99 的 elasticsearch.yml

cluster.name: elasticsearch
node.name: Node_master
node.data: true
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: x.x.x.99
http.port: 9200
discovery.seed_hosts: ["x.x.x.245:9300"]
cluster.initial_master_nodes: ["x.x.x.246:9300"]

在机器上测试运行 elasticsearch

当我在每台机器上运行systemctl start elasticsearch 时，它运行良好。

在 x.x.x.246 上测试运行

curl -X GET "X.X.X.246:9200/_cluster/health?pretty"

显示：节点编号不变

curl -X GET "X.X.X.99:9200/_cluster/health?pretty

显示：

{
  "error" : {
    "root_cause" : [
      {
        "type" : "master_not_discovered_exception",
        "reason" : null
      }
    ],
    "type" : "master_not_discovered_exception",
    "reason" : null
  },
  "status" : 503
}

已编辑

这里是 x.x.x.246 的 elasticsearch.yml：

cluster.name: elasticsearch
node.name: master
node.master: true
node.data: true
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["x.x.x.99","x.x.x.246]
cluster.initial_master_nodes: ["x.x.x.246"]
logger.org.elasticsearch.discovery: TRACE

这里是 x.x.x.99 的 elasticsearch.yml

cluster.name: elasticsearch
node.name: node
node.data: true
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["x.x.x.246","x.x.x.99"]
cluster.initial_master_nodes: ["x.x.x.246"]
logger.org.elasticsearch.discovery: TRACE

登录 x.x.x.99：

[root@dev ~]# tail -30 /var/log/elasticsearch/elasticsearch.log
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:692) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.6.1.jar:7.6.1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
        at java.lang.Thread.run(Thread.java:830) ~[?:?]
[2020-03-19T12:12:04,462][INFO ][o.e.c.c.JoinHelper       ] [node-1] failed to join {master}{0UHYehfNQ2-WCadTC_VVkA}{1FNy5AJrTpKOCAejBLKR2w}{10.64.2.246}{10.64.2.246:9300}{dilm}{ml.machine_memory=1907810304, ml.max_open_jobs=20, xpack.installed=true} with JoinRequest{sourceNode={node-1}{jb_3lJq1R5-BZtxlPs_NyQ}{a4TYDhG7SWqL3CSG4tusEg}{10.64.2.99}{10.64.2.99:9300}{d}{xpack.installed=true}, optionalJoin=Optional[Join{term=178, lastAcceptedTerm=8, lastAcceptedVersion=100, sourceNode={node-1}{jb_3lJq1R5-BZtxlPs_NyQ}{a4TYDhG7SWqL3CSG4tusEg}{10.64.2.99}{10.64.2.99:9300}{d}{xpack.installed=true}, targetNode={master}{0UHYehfNQ2-WCadTC_VVkA}{1FNy5AJrTpKOCAejBLKR2w}{10.64.2.246}{10.64.2.246:9300}{dilm}{ml.machine_memory=1907810304, ml.max_open_jobs=20, xpack.installed=true}}]}
org.elasticsearch.transport.RemoteTransportException: [master][10.64.2.246:9300][internal:cluster/coordination/join]
Caused by: java.lang.IllegalStateException: failure when sending a validation request to node
        at org.elasticsearch.cluster.coordination.Coordinator$2.onFailure(Coordinator.java:514) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:59) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1118) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1118) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.transport.InboundHandler.lambda$handleException$2(InboundHandler.java:244) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:633) ~[elasticsearch-7.6.1.jar:7.6.1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
        at java.lang.Thread.run(Thread.java:830) [?:?]
Caused by: org.elasticsearch.transport.RemoteTransportException: [node-1][10.64.2.99:9300][internal:cluster/coordination/join/validate]
Caused by: org.elasticsearch.cluster.coordination.CoordinationStateRejectedException: join validation on cluster state with a different cluster uuid P4QlwvuRRGSmlT77RroSjA than local cluster uuid oUoIe2-bSbS2UPg722ud9Q, rejecting
        at org.elasticsearch.cluster.coordination.JoinHelper.lambda$new$4(JoinHelper.java:148) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler$1.doRun(SecurityServerTransportInterceptor.java:257) ~[?:?]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:315) ~[?:?]
        at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.transport.InboundHandler$RequestHandler.doRun(InboundHandler.java:264) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:692) ~[elasticsearch-7.6.1.jar:7.6.1]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.6.1.jar:7.6.1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
        at java.lang.Thread.run(Thread.java:830) ~[?:?]

Answer 1

对于节点x.x.x.99，种子主机的条目错误。应该是这样的：

discovery.seed_hosts: ["x.x.x.246:9300"]

discovery.seed_hosts 列表用于检测主节点，因为该列表包含节点的地址，这些节点是主节点，并且还保存了当前主节点的信息，因为它指向x.x.x.245而x.x.x.99的配置中的x.x.x.246，节点x.x.x.99无法检测到master。

在评论中发表讨论正确的配置应该是：

主节点：

cluster.name: elasticsearch
node.name: master
node.master: true
node.data: true
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["x.x.x.246]
cluster.initial_master_nodes: ["master"]

请注意，如果您希望上述节点仅作为主节点而不保存数据，请设置

node.data: false

数据节点：

cluster.name: elasticsearch
node.name: data-node-1
node.data: true
node.master: false
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["x.x.x.246"]

此外，由于节点 x.x.x.99 无法加入集群，因此它的集群状态已过时。所以删除x.x.x.99上的data文件夹并重启这个节点。

Answer 2

它无法选择主节点的原因是提到了discovery.seed_hosts: ["x.x.x.245:9300"]，它不是当前主节点配置的一部分，也不是主节点配置的一部分。正如this 官方 ES 文档中所述，它用于选举主节点。

您应该详细阅读与主选择相关的 2 个重要配置：

discovery.seed_hosts

initial_master_nodes

您可以在Discovery 模块上打开调试日志以更好地理解它，方法是在elasticsearch.yml 的行下方添加

logger.org.elasticsearch.discovery: DEBUG

您可以在elasticsearch.yml 中进行一些修改。

1. node.name 在两个节点 elasticsearch.yml 中具有相同的名称。
2. 最好只提ip不带端口9200。
3. 最好给network.host: 0.0.0.0 值，而不是elasticsearch.yml 中的节点ip。
4. node.data: true 是默认的，所以不用提了。

更好更简洁的版本如下所示：

主节点 elasticsearch.yml

cluster.name: elasticsearch
node.name: master
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
discovery.seed_hosts: ["x.x.x.99", "x.x.x.246"] -->note this
cluster.initial_master_nodes: ["x.x.x.246"] :- note this

另一个数据节点elasticsearch.yml

cluster.name: elasticsearch
node.name: data
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["x.x.x.99", "x.x.x.246"] --> you need to change this and include both nodes
cluster.initial_master_nodes: ["x.x.x.246"]

验证主节点

您可以点击<your-any-node-ip>:9200/_cat/master，这将返回选定的主节点，在您的案例中，该节点的名称为master。有关this 的更多信息。

Answer 3

我也遇到了同样的问题，当我尝试从 AWS Windows 服务器外部访问弹性搜索时，我无法访问它，之后我添加了

network.host : aws_private_ip

然后我们需要重新启动弹性服务，但它在重新启动时抛出错误，最后在下面添加时，它对我有用，

cluster.initial_master_nodes: node-1