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https://issues.apache.org/jira/browse/HDFS-16950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Palanisamy updated HDFS-16950:
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Description:
Namenode failed in the production cluster when JN role is migrated.
{code:java}
ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
java.io.IOException: There appears to be a gap in the edit log. We expected
txid xxxxxx, but got txid xxxxxx. {code}
InitializeSharedEdits issued as part of the role migration step. Note, no
checkpoint is performed in the past few hours.
InitializeSharedEdits created a new log segment from the edit_inprogres
transaction and deleted all old transactions.
My ask here is to delete any edit transaction older than the fimage
transaction. But currently, it deletes all transactions and no check is
enforced in JNStorage#format().
was:
Namenode failed in the production cluster when JN role is migrated.
{code:java}
2023-03-15 00:27:11,173 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode:
Failed to start namenode.
java.io.IOException: There appears to be a gap in the edit log. We expected
txid xxxxxx, but got txid xxxxxx. {code}
InitializeSharedEdits issued as part of the role migration step. Note, no
checkpoint is performed in the past few hours.
InitializeSharedEdits created a new log segment from the edit_inprogres
transaction and deleted all old transactions.
My ask here is to delete any edit transaction older than the fimage
transaction. But currently, it deletes all transactions and no check is
enforced in JNStorage#format().
> Gap in edits after -initializeSharedEdits
> -----------------------------------------
>
> Key: HDFS-16950
> URL: https://issues.apache.org/jira/browse/HDFS-16950
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: journal-node, namenode
> Reporter: Karthik Palanisamy
> Priority: Major
>
> Namenode failed in the production cluster when JN role is migrated.
> {code:java}
> ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start
> namenode.
> java.io.IOException: There appears to be a gap in the edit log. We expected
> txid xxxxxx, but got txid xxxxxx. {code}
> InitializeSharedEdits issued as part of the role migration step. Note, no
> checkpoint is performed in the past few hours.
> InitializeSharedEdits created a new log segment from the edit_inprogres
> transaction and deleted all old transactions.
> My ask here is to delete any edit transaction older than the fimage
> transaction. But currently, it deletes all transactions and no check is
> enforced in JNStorage#format().
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