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https://issues.apache.org/jira/browse/IOTDB-4631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17623646#comment-17623646
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Gaofei Cao commented on IOTDB-4631:
-----------------------------------
Executing remove-datanode.sh simultaneously lead to this problem, we need
adding a lock to resolve it.
> [ remove datanode ] The number of nodes that can be removed is not determined
> -----------------------------------------------------------------------------
>
> Key: IOTDB-4631
> URL: https://issues.apache.org/jira/browse/IOTDB-4631
> Project: Apache IoTDB
> Issue Type: Bug
> Components: mpp-cluster
> Affects Versions: 0.14.0-SNAPSHOT
> Reporter: 刘珍
> Assignee: Gaofei Cao
> Priority: Major
> Attachments: more_dev.conf, screenshot-1.png, screenshot-2.png,
> screenshot-3.png
>
>
> m_1012_d7ed1c1
> 3副本，3C5D，multiLeader
> 可缩容的节点数没有进行判定，缩容3个datanode都成功，导致可用datanode只有2个，小于副本数（3）
> 第2个，第3个缩容操作对应的节点的数据没迁移成功，缩容后查询5万dev（select count(s_0),count(s_599) from
> root.** align by device;），只返回1000条记录
> 缩容3个节点后的集群状态 ：
> !screenshot-2.png!
> !screenshot-1.png!
> 测试环境
> 1. 192.168.10.72/73/74/75/76 5个物理机 48cpu 384GB
> 3C：72/73/74
> 5D: 72/73/74/75/76
> bm在ip1
> ConfigNode
> MAX_HEAP_SIZE="8G"
> schema_region_consensus_protocol_class=org.apache.iotdb.consensus.ratis.RatisConsensus
> data_region_consensus_protocol_class=org.apache.iotdb.consensus.multileader.MultiLeaderConsensus
> schema_replication_factor=3
> data_replication_factor=3
> DataNode
> MAX_HEAP_SIZE="256G"
> MAX_DIRECT_MEMORY_SIZE="32G"
> max_connection_for_internal_service=300
> enable_timed_flush_seq_memtable=true
> seq_memtable_flush_interval_in_ms=3600000
> seq_memtable_flush_check_interval_in_ms=600000
> enable_timed_flush_unseq_memtable=true
> unseq_memtable_flush_interval_in_ms=3600000
> unseq_memtable_flush_check_interval_in_ms=600000
> query_timeout_threshold=36000000
> 启动3C5D集群
> 2. bm写入完成
> 配置见附件
> 3. 执行缩容脚本
> 脚本在ip72，缩容3个datanode，在第3个缩容操作应该报错，实际处理了缩容，进程退出（data没迁移）
> liuzhen@fit-72:/data/mpp_test/m_1012_d7ed1c1/datanode$ cat rm.sh
> #!/bin.bash
> ./sbin/remove-datanode.sh 192.168.10.72:6667 > rm_ip72.out
> sleep 2h
> ./sbin/remove-datanode.sh 192.168.10.73:6667 > rm_ip73.out
> ./sbin/remove-datanode.sh 5 > rm_ip74.out
> ip74的log：
> 2022-10-13 00:23:37,887 [pool-22-IoTDB-DataNodeInternalRPC-Processor-67] INFO
> o.a.i.c.conf.CommonConfig:315 -{color:#DE350B}* Change system status to
> Removing! The current Node is being removed from cluster!*{color}
> 另外 ip73的data也没迁移成功，ip73缩容后的data：
> !screenshot-3.png!
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