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https://issues.apache.org/jira/browse/HDFS-16349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17450297#comment-17450297
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chuanjie.duan commented on HDFS-16349:
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Upload Patch，I just remove "+ 2" for esclipe checkForGaps, because we won't
load any editlog
> FSEditLog checkForGaps break HDFS RollingUpgrade Rollback
> ---------------------------------------------------------
>
> Key: HDFS-16349
> URL: https://issues.apache.org/jira/browse/HDFS-16349
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 3.2.2, 3.2.3
> Reporter: chuanjie.duan
> Priority: Blocker
> Attachments: HDFS-16349-branch-3.2.3.patch
>
>
> 2021-11-22 20:36:44,440 INFO
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager: Using longest
> log: 10.65.57.133:8485=segmentState {
> startTxId: 3906965
> endTxId: 3906965
> isInProgress: false
> }
> lastWriterEpoch: 5
> lastCommittedTxId: 3906964
> 2021-11-22 20:36:44,457 INFO
> org.apache.hadoop.hdfs.server.namenode.FileJournalManager: Recovering
> unfinalized segments in /data12/data/flashHadoopU/namenode/current
> 2021-11-22 20:36:44,495 INFO
> org.apache.hadoop.hdfs.server.namenode.FileJournalManager: Finalizing edits
> file
> /data12/data/flashHadoopU/namenode/current/edits_inprogress_0000000000003898378
> ->
> /data12/data/flashHadoopU/namenode/current/edits_0000000000003898378-0000000000003898412
> 2021-11-22 20:36:44,657 WARN
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception
> loading fsimage
> java.io.IOException: Gap in transactions. Expected to be able to read up
> until at least txid 2510934 but unable to find any edit logs containing txid
> 2510933
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.checkForGaps(FSEditLog.java:1578)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1536)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:652)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:294)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:976)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:681)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:585)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:645)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:812)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:796)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1493)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1559)
> 2021-11-22 20:36:44,660 INFO org.mortbay.log: Stopped
> HttpServer2$selectchannelconnectorwithsafestar...@pro-hadoop-dc01-057133.vm.dc01.hellocloud.tech:50070
> 2021-11-22 20:36:44,760 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics
> system...
> 2021-11-22 20:36:44,761 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
> stopped.
> 2021-11-22 20:36:44,761 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
> shutdown complete.
> 2021-11-22 20:36:44,761 ERROR
> org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
> Old version: 2.7.3
> New version: 3.2.2
> Steps to Reproduce
> Step 1: Start NN1 as active , NN2 as standby .
> Step 2: Perform "hdfs dfsadmin -rollingUpgrade prepare"
> Step 3: Start NN2 active and NN1 as standby with rolling upgrade started
> option.
> Step 4: DN also restarted in upgrade mode.
> Step 5: Restart journalnode with new hadoop version
> Step 6: a few days later
> Step 7: bring down both NN, journalnode, DN
> Step 8: Start JN with old version
> Step 9: Start NN1 with rolling upgrade rollback option. nn started failed
> with above ERROR(Above mentioned txid version 2510933 has been deleted
> because of checkpoint mechanism)
>
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