PXB-3606 Backup may succeed with incomplete redo log#1704
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Description
===========
The backup log shows "Unable to open #ib_redo (error: 1504)", but the
backup was still successful with "Complete OK!".
Analysis
========
After backing up all files, xtrabackup get last_lsn from
performance_schema.log_status. If an exception occurs when copying to
the last_lsn, such as a redo log purge, xtrabackup does not handle the
error correctly, resulting in a backup set that is missing redo log.
Fix
===
Complete error handling during redo log copying.
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Description
The backup log shows "Unable to open #ib_redo (error: 1504)", but the
backup was still successful with "Complete OK!".
Analysis
After backing up all files, xtrabackup get last_lsn from
performance_schema.log_status. If an exception occurs when copying to
the last_lsn, such as a redo log purge, xtrabackup does not handle the
error correctly, resulting in a backup set that is missing redo log.
Fix
Complete error handling during redo log copying.