Regression in XtraBackup 2.0.0 in case of an incomplete log block

Reported by Alexey Kopytov on 2012-06-20
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Percona XtraBackup
Critical
Alexey Kopytov
2.0
Critical
Alexey Kopytov
2.1
Critical
Alexey Kopytov

Bug Description

When XtraBackup reads a log block that has not been completely written by the server yet, it fails with an error complaining about log block checksum mismatch. Which is a regression introduced in 2.0 by the fix for bug #805593.

XtraBackup 1.6 will print a warning, but will retry reading the same block later.

Alexey Kopytov (akopytov) wrote :

Example of a failure (to make the bug findable by search engines):

xtrabackup: error: Log block checksum mismatch (block no 933830996 at lsn 1028145714688):
expected 997077168, calculated checksum 438936379
xtrabackup: Error: xtrabackup_copy_logfile() failed.

xtrabackup: Error: log_copying_thread failed.

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