James Brown created CASSANDRA-17473:
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Summary: sstables changing in snapshots
Key: CASSANDRA-17473
URL: https://issues.apache.org/jira/browse/CASSANDRA-17473
Project: Cassandra
Issue Type: Bug
Reporter: James Brown
We use cassandra snapshots and {tar} to make full backups of our cassandra
clusters. Sometimes, tar fails with a message like
{{tar:
data/addresses/addresses-eb0196100b7d11ec852b1541747d640a/snapshots/backup20220318183708/nb-167-big-Data.db:
file changed as we read it}}
This is kind of strange, since we're reading from a snapshot.
The (very simplified) relevant snippet looks roughly like
{{nice nodetool "${JMX_ARGS[@]}" snapshot -t "$TAG" "${KEYSPACES[@]}"
tar --hard-dereference -czpf data/*/*/snapshots/"$TAG"/}}
This happens maybe 1% of the time when taking backups.
There are no concurrent snapshots going on, but there are concurrent
compactions and repairs, of course. If it matters, this cluster _is_ running
incremental repairs.
This is on Cassandra 4.0.3.
It seems wrong to me that an sstable could ever be written to while it's in a
snapshot.
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