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https://issues.apache.org/jira/browse/IOTDB-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Haonan Hou reassigned IOTDB-4027:
---------------------------------
Assignee: Song Ziyang (was: Liuxuxin)
> ERROR o.a.i.d.e.s.SnapshotLoader:94 - Exception occurs when creating links
> from snapshot directory to data directory
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: IOTDB-4027
> URL: https://issues.apache.org/jira/browse/IOTDB-4027
> Project: Apache IoTDB
> Issue Type: Bug
> Components: mpp-cluster
> Affects Versions: 0.14.0-SNAPSHOT
> Reporter: 刘珍
> Assignee: Song Ziyang
> Priority: Major
> Attachments: image-2022-08-03-09-39-10-230.png,
> image-2022-08-03-09-39-48-739.png, ip18_befor_stop_datanode_log.tar.gz,
> ip18_restart_with-error_log.tar.gz, ip4_2000_config.properties,
> screenshot-1.png
>
>
> master_0801_55b5b17
> 问题描述
> RatisConsensus，3副本3C9D，1个bm连1个datanode执行并发写入，停止1个follower节点，5分钟后启动；{color:#DE350B}*然后停止另1个follower节点10分钟后启动，此节点启动过程中报错，此节点少数据*{color}：
> 2022-08-02 18:04:17,376 [pool-4-thread-1] ERROR o.a.i.d.e.s.SnapshotLoader:94
> - Exception occurs when creating links from snapshot directory to data
> directory
> java.io.IOException: Cannot find
> /data/iotdb/master_0801_2de0dd8/datanode/./sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/sm/1_354536/sequence/root.ip4.g_0
> or
> /data/iotdb/master_0801_2de0dd8/datanode/./sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/sm/1_354536/unsequence/root.ip4.g_0
> at
> org.apache.iotdb.db.engine.snapshot.SnapshotLoader.createLinksFromSnapshotDirToDataDir(SnapshotLoader.java:163)
> at
> org.apache.iotdb.db.engine.snapshot.SnapshotLoader.loadSnapshotForStateMachine(SnapshotLoader.java:91)
> at
> org.apache.iotdb.db.consensus.statemachine.DataRegionStateMachine.loadSnapshot(DataRegionStateMachine.java:93)
> at
> org.apache.iotdb.consensus.ratis.ApplicationStateMachineProxy.loadSnapshot(ApplicationStateMachineProxy.java:188)
> at
> org.apache.iotdb.consensus.ratis.ApplicationStateMachineProxy.lambda$initialize$0(ApplicationStateMachineProxy.java:73)
> at
> org.apache.ratis.util.LifeCycle.startAndTransition(LifeCycle.java:270)
> at
> org.apache.iotdb.consensus.ratis.ApplicationStateMachineProxy.initialize(ApplicationStateMachineProxy.java:69)
> at
> org.apache.ratis.server.impl.ServerState.<init>(ServerState.java:136)
> at
> org.apache.ratis.server.impl.RaftServerImpl.<init>(RaftServerImpl.java:201)
> at
> org.apache.ratis.server.impl.RaftServerProxy.lambda$newRaftServerImpl$5(RaftServerProxy.java:274)
> at
> java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> 2022-08-02 18:04:17,376 [pool-4-thread-1] ERROR
> o.a.i.d.c.s.DataRegionStateMachine:95 - Fail to load snapshot from
> /data/iotdb/master_0801_2de0dd8/datanode/./sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/sm/1_354536
> ip18少数据，期望序列的count值是20000点
> !screenshot-1.png!
> 1. 复现流程
> 私有云172.20.70.2/3/4/5/13/14/16/18/19
> benchmark 在ip15（连ip4）
> 停ip4/启动ip4 , 停ip18/启动ip18，ip18报错
> !image-2022-08-03-09-39-10-230.png!
> !image-2022-08-03-09-39-48-739.png!
> 2. 启动benchmark
> 2022-08-02 17:34:57 启动bm
> 3. 停止ip4的datanode
> 2022-08-02 17:45:42停止datanode
> sleep 300
> 启动ip4
> 4. 停止ip18的datanode
> 2022-08-02 17:54:11 停止ip18的datanode
> sleep 600
> 启动ip18
> {color:#DE350B}*启动过程中，报错*{color}：
> 见问题描述
> bm写入完成，各节点同步完成，{color:#DE350B}*ip18节点少数据*{color}，ip16，ip4 的数据正确。
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