Andrew Wong created KUDU-3260:
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Summary: Reduce the on-disk footprint of transaction metadata in
participants
Key: KUDU-3260
URL: https://issues.apache.org/jira/browse/KUDU-3260
Project: Kudu
Issue Type: Improvement
Components: server, transactions
Reporter: Andrew Wong
We should remove the commit timestamp and txn metadata once we've flushed all
in-memory stores that rely on metadata for determining commit timestamp. If we
see tablets serving more frequent transactions, the persisted metadata may
become less negligible.
One thing to watch out for here is that we currently use metadata to determine
whether a transaction has _ever_ existed on the participant – if we simply get
rid of the metadata, we will lose out on this knowledge. More thought should be
given to how and when to do this safely, and ensure that we clean up the
metadata in such a way that no invariants are broken with regards to knowing
about transaction existence (e.g. perhaps only clean up the txn metadata if the
corresponding TxnStatusManager has been deleted?).
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