55 lines
1.6 KiB
Markdown
55 lines
1.6 KiB
Markdown
---
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{
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"title": "ALTER CLUSTER",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# ALTER CLUSTER
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## description
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该语句用于更新逻辑集群。需要有管理员权限
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语法
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ALTER CLUSTER cluster_name PROPERTIES ("key"="value", ...);
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1. 缩容，扩容 （根据集群现有的be数目，大则为扩容，小则为缩容), 扩容为同步操作，缩容为异步操作，通过backend的状态可以得知是否缩容完成
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PROERTIES ("instance_num" = "3")
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instance_num 逻辑集群节点树
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## example
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1. 缩容，减少含有3个be的逻辑集群test_cluster的be数为2
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ALTER CLUSTER test_cluster PROPERTIES ("instance_num"="2");
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2. 扩容，增加含有3个be的逻辑集群test_cluster的be数为4
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ALTER CLUSTER test_cluster PROPERTIES ("instance_num"="4");
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## keyword
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ALTER,CLUSTER
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