一、索引管理
1、 创建索引
PUT test-2019-03
{
"settings": {
"index": {
"number_of_shards": 10,
"number_of_replicas": 1,
"routing": {
"allocation": {
"include": {
"type": "hot"
}
}
}
}
}
}
2、 删除索引
DELETE test-2019-03
DELETE test*
支持通配符*
3、 修改索引
修改副本数:
PUT test-2019-03/_settings
{
"index": {
"number_of_replicas": 0
}
}
4、 重构索引ReIndex
POST _reindex
{
"source": {
"index": ["test-2018-07-*"]
},
"dest": {
"index": "test -2018-07"
}
}
查看reIndex任务:
GET _tasks?detailed=true&actions=*reindex
5、 删除数据delete_by_query
POST indexApple-2019-02/_delete_by_query?conflicts=proceed
{
"query": {
"bool" : {
"must" : {
"term" : { "appIndex" : "apple" }
},
"filter" : {
"range": {
"timestamp": {
"gte": "2019-02-23 08:00:00",
"lte": "2019-02-23 22:00:00",
"time_zone" :"+08:00"
}
}
}
}
}
}
查看delete_by_query任务:
GET _tasks?detailed=true&actions=*/delete/byquery
二、集群设置
ES cluster的settings:
curl -XPUT http://
1、Shard Allocation Settings
{"persistent":{"cluster.routing.allocation.enable": "all"}}
设置集群哪种分片允许分配,4个选项:
all - (default) Allows shard allocation for all kinds of shards.
primaries - Allows shard allocation only for primary shards.
new_primaries - Allows shard allocation only for primary shards for new indices.
none - No shard allocations of any kind are allowed for any indices.
{"persistent":{"cluster.routing.allocation.node_concurrent_recoveries": 8}}
设置在节点上并发分片恢复的个数(写和读)。
{"persistent":{"cluster.routing.allocation.node_initial_primaries_recoveries": 16}}
设置节点重启后有多少并发数从本地恢复未分配的主分片。
{"persistent":{"indices.recovery.max_bytes_per_sec": "500mb"}}
设置索引恢复时每秒字节数。
2、Shard Rebalancing Settings
{"persistent":{"cluster.routing. rebalance.enable": "all"}}
设置集群哪种分片允许重平衡,4个选项:
all - (default) Allows shard balancing for all kinds of shards.
primaries - Allows shard balancing only for primary shards.
replicas - Allows shard balancing only for replica shards.
none - No shard balancing of any kind are allowed for any indices.
{"persistent":{"cluster.routing. allocation. allow_rebalance": "all"}}
always - Always allow rebalancing.
indices_primaries_active - Only when all primaries in the cluster are allocated.
indices_all_active - (default) Only when all shards (primaries and replicas) in the cluster are allocated.
{"transient":{"cluster.routing.allocation.cluster_concurrent_rebalance": 8}}
设置在集群上并发分片重平衡的个数,只控制“重平衡”过程的并发数,对集群“恢复”和其他情况下的并发数没有影响。
{"transient":{"cluster.routing.allocation.cluster_concurrent_rebalance": 0}}
禁用集群“rebalance”
{"transient":{"cluster.routing.allocation.cluster_concurrent_rebalance": null}}
启用集群“rebalance”
3、Disk-based Shard Allocation
#调整数据节点的低水位值为80%
{"transient":{"cluster.routing.allocation.disk.watermark.low":"80%"}}
#调整数据节点的高水位值为90%
{"transient":{"cluster.routing.allocation.disk.watermark.high":"90%"}}
#取消用户设置,集群恢复这一项的默认配置
{"transient":{"cluster.routing.allocation.disk.watermark.low": null}}
{"transient":{"cluster.routing.allocation.disk.watermark.high": null}}
4、Allocation策略
明确指定是否允许分片分配到指定Node上,分为index级别和cluster级别
- index.routing.allocation.require.{attribute}
- index.routing.allocation.include{attribute}
- index.routing.allocation.exclude.{attribute}
- cluster.routing.allocation.require.{attribute}
- cluster.routing.allocation.include.{attribute}
- cluster.routing.allocation.exclude.{attribute}
require表示必须分配到指定node,include表示可以分配到指定node,exclude表示不允许分配到指定Node,cluster的配置会覆盖index级别的配置,比如index include某个node,cluster exclude某个node,最后的结果是exclude某个node
#通过IP,排除集群中的某个节点:节点IP:10.100.0.11
{"transient":{"cluster.routing.allocation.exclude._ip":"10.100.0.11"}}
#通过IP,排除集群中的多个节点:节点IP:10.10.0.11,10.100.0.12
{"transient":{"cluster.routing.allocation.exclude._ip":"10.100.0.11,10.100.0.12"}}
#取消节点排除的限制
{"transient":{"cluster.routing.allocation.exclude._ip": null}}
设置索引不分配到某些IP:
PUT test/_settings
{
"index.routing.allocation.exclude._ip": "192.168.2.*"
}
默认支持的属性:
_name Match nodes by node name
_host_ip Match nodes by host IP address (IP associated with hostname)
_publish_ip Match nodes by publish IP address
_ip Match either _host_ip or _publish_ip
_host Match nodes by hostname
5、Shard分配问题
1、查看集群unassigned shards原因
GET _cluster/allocation/explain?pretty
2、查看索引的恢复状态,以索引user为例
GET user/_recovery?active_only=true
3、使用reroute重试之前分配失败的,集群在尝试分配分片index.allocation.max_retries(默认为5)次后会放弃分配
POST /_cluster/reroute?retry_failed=true
4、查看状态是red的索引
GET _cat/indices?health=red
集群滚动重启
1、准备工作
##提前打开如下信息,有些API是需要观察的各项指标(出现问题则停止重启),其余是配合检查的API:
##查看集群UNASSIGEN shards原因
curl http://0.0.0.0:9200/_cluster/allocation/explain?pretty
###集群配置
curl http://0.0.0.0:9200/_cluster/settings?pretty
###pending-tasks
curl http://0.0.0.0:9200/_cluster/pending_tasks?pretty
###集群健康
curl http://0.0.0.0:9200/_cluster/health?pretty
2、重启client-node
#start
步骤1:关闭其中一个client节点
步骤2:重启节点
步骤3:检查节点是否加入集群
步骤4:重复步骤2-3重启其他节点
#end
3、重启master-node
#start
步骤1:明确master节点IP
步骤2:关闭master-node组的一个非master节点
步骤3:重启节点
步骤4:检查节点是否加入集群(确保已经加入集群)
步骤5:重复步骤2-4,重启另外的master-node组的一个非master节点
步骤6:关闭master节点
步骤7:重启master节点
##在master节点选举过程中,集群功能不可用(包括了:索引功能、search功能,API功能堵塞等),集群并不会立即选举出master节点(默认进行选举的时间为3s, 由于网络的问题,往往将master选举的时间延长)
步骤8:检查集群装填,检查节点是否加入集群。
##当master选举出来,集群功能将全部正常。
#end
4、重启data-node
#start
步骤1:禁用分片分配
curl -X PUT http://0.0.0.0:9200/_cluster/settings?pretty -d '{"transient": {"cluster.routing.allocation.enable": "new_primaries"}}'
##禁用分片分配期间,集群新建索引将无法分配副本分片,允许新建索引主分片的分配
步骤2:执行同步刷新
curl -XPOST "http://0.0.0.0:9200/_flush/synced?pretty"
##对于在此刻不在更新的索引,此操作将通过synced值来确认主副分片是否数据一致(加快了分片加入集群的时间);对于在此刻索引发生变化的分片,此操作对节点加入集群的索引恢复没有作用
步骤3:关闭一个data-node节点
步骤4:重启节点
步骤5:检查节点是否加入集群
步骤6:启用分片分配
curl -X PUT http://0.0.0.0:9200/_cluster/settings?pretty -d '{"transient": {"cluster.routing.allocation.enable": "all"}}'
步骤7:检查集群状态是否为green
##在启用了分片分配后,UNASSIGEN shards会瞬间减少(不会瞬间减少为0,因为在大的ES集群中,每个节点都会有在更新的索引分片);之后会出现一些initializing shards,这部分分片会需要等待一段时间才会减少为0(分片同步过程中)
步骤8:重复步骤3-7,重启其他节点
步骤9:节点全部重启完毕后,检查集群配置,确保没有禁用分片分配
#end
参考资料:
ES官方重启教程 https://www.elastic.co/guide/en/elasticsearch/reference/1.4/cluster-nodes-shutdown.html#_rolling_restart_of_nodes_full_cluster_restart
参考:
https://www.elastic.co/guide/en/elasticsearch/reference/6.2/index.html