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https://issues.apache.org/jira/browse/IOTDB-5324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653008#comment-17653008
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Haiming Zhu commented on IOTDB-5324:
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The safelyDeletedSearchIndex is always Long.MIN_VALUE, which means the region
status isn't set correctly after being migrated.
!40971672369689_.pic.jpg!
> [migrate region] 1rep1C4D ,after the region is migrated successfully， wal
> cannot be deleted from destDataNode
> --------------------------------------------------------------------------------------------------------------
>
> Key: IOTDB-5324
> URL: https://issues.apache.org/jira/browse/IOTDB-5324
> Project: Apache IoTDB
> Issue Type: Bug
> Components: mpp-cluster
> Affects Versions: master branch
> Reporter: 刘珍
> Assignee: Gaofei Cao
> Priority: Major
> Attachments: 40971672369689_.pic.jpg, mig.conf, screenshot-1.png,
> screenshot-2.png
>
>
> m_1229_0fedffd
> 问题描述
> 1副本1C4D集群，写入数据过程中，迁移region（Id=1 from ip4 to ip14）成功，但是目的节点的wal删不掉。
> 1.启动1副本1C4D集群
> config/schema/data 是ratis/ratis/IoT协议
> 2.BM 写入数据（配置见附件）
> 9分钟后，迁移region
> ./sbin/start-cli.sh -h 172.20.70.4 -e "migrate region 1 from 2 to 3"
> 迁移成功，耗时20秒（2022-12-29 18:25:17,621-2022-12-29 18:25:37,676）
> 但是ip14的datanode
> 的regionId=1的wal删除不掉，导致大小为50GB，一直有限流的WARN日志，BM16个多小时不结束，理论上BM1个多小时就应该执行完成：
> 2022-12-30 10:14:07,669
> [pool-25-IoTDB-ClientRPC-Processor-59$20221230_021337_10719_3.1.0] WARN
> o.a.i.d.m.p.s.FragmentInstanceDispatcherImpl:243 - write locally failed.
> TSStatus: TSStatus(code:606, message:Reject write because there are too many
> requests need to process), message: Reject write because there are too many
> requests need to process
> 测试环境：私有云3期
> DataNode配置
> MAX_HEAP_SIZE="20G"
> MAX_DIRECT_MEMORY_SIZE="6G"
> dn_max_connection_for_internal_service=300
> ConfigNode配置
> MAX_HEAP_SIZE="20G"
> MAX_DIRECT_MEMORY_SIZE="6G"
> 迁移region前的region信息
> !screenshot-1.png!
> 迁移region成功后的region信息
> !screenshot-2.png!
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