org.elasticsearch.cluster.block.clusterblockexception: blocked by: [service_unavailable/1/state not

一. 搭建集群时出现错误

错误日志elasticsearch.log

org.elasticsearch.cluster.block.clusterblockexception: blocked by: [service_unavailable/1/state not recovered / initialized];

[2021-12-04T11:21:36,848][INFO ][o.e.n.Node               ] [x1KT3lU] started
[2021-12-04T11:21:37,465][WARN ][r.suppressed             ] path: /.reporting-*/esqueue/_search, params: {index=.reporting-*, type=esqueue, version=true}
org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized];
	at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedException(ClusterBlocks.java:166) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedRaiseException(ClusterBlocks.java:152) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.action.search.TransportSearchAction.executeSearch(TransportSearchAction.java:286) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.action.search.TransportSearchAction.lambda$doExecute$4(TransportSearchAction.java:193) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:60) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.index.query.Rewriteable.rewriteAndFetch(Rewriteable.java:113) ~[elasticsearch-6.3.0.jar:6.3.0]
	at org.elasticsearch.index.query.Rewriteable.rewriteAndFetch(Rewriteable.java:86) ~[elasticsearch-6.3.0.jar:6.3.0]
	

原因：

由于磁盘空间不足，导致Elasticsearch触发磁盘保护，强制将所有索引设置成了只读状态，相关参数见官方文档：Disk-based Shard Allocation。

主要相关参数如下：

• cluster.routing.allocation.disk.threshold_enabled：是否启动根据磁盘空间自动分配，默认为true
• cluster.routing.allocation.disk.watermark.low：控制磁盘使用率的低水位，默认是85%，当一个节点的磁盘空间使用率超过85%，就不会给该节点分配新的shard
• cluster.routing.allocation.disk.watermark.high：控制磁盘使用率的高水位，默认是90%，当一个节点的磁盘空间使用率超过90%，就会将该节点的部分shard转移到其他节点上
• cluster.routing.allocation.disk.watermark.flood_stage：洪水水位线，默认为95%，当一个节点的磁盘空间使用率超过95%，就会把所有索引设为只读。这是最后一个保护措施，索引的只读状态必须通过人工手动解除
• cluster.info.update.interval：检查磁盘使用率的频率，默认30s

解决方案：

在elasticsearch.yml中添加cluster.routing.allocation.disk.threshold_enabled：false 即关闭磁盘分配保护

补充：

path.data: /opt/elasticsearch/data # 数据目录位置
path.logs: /opt/elasticsearch/logs # 日志目录位置
network.host: 0.0.0.0 # 此行前面带一个空格 绑定到0.0.0.0，允许任何ip来访问