java.io.IOException: There appears to be a gap in the edit log. We expected txid ***, but got txid(示 _exception:

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方式1
原因：namenode元数据被破坏，需要修复
解决：恢复一下namenode

hadoop namenode -recover

一路选择Y，一般就OK了
方式2
Need to copy the edits file to the journal node (I have 3 journal node s101 s102 s103)

[[email protected] /home/centos/hadoop/ha/dfs/name1/current]$scp edits_0000000000000000041-0000000000000000043 [email protected]:/home/centos/hadoop/ha/dfs/journal/mycluster/current[[email protected] /home/centos/hadoop/ha/dfs/name1/current]$scp edits_0000000000000000041-0000000000000000043 [email protected]:/home/centos/hadoop/ha/dfs/journal/mycluster/current[[email protected] /home/centos/hadoop/ha/dfs/name1/current]$scp edits_0000000000000000041-0000000000000000043 [email protected]:/home/centos/hadoop/ha/dfs/journal/mycluster/current[[email protected] /home/centos/hadoop/ha/dfs/name1/current]$hdfs zkfc -formatZK

https://blog.csdn.net/u011478909/article/details/51864071
【java.io.IOException: There appears to be a gap in the edit log. We expected txid ***, but got txid(示】https://blog.csdn.net/wqhaber/article/details/77529049