Ivan Andika created HDDS-13596:
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Summary: Revisit ListKeys and ListStatus consistency guarantees
Key: HDDS-13596
URL: https://issues.apache.org/jira/browse/HDDS-13596
Project: Apache Ozone
Issue Type: Improvement
Reporter: Ivan Andika
This is a ticket to revisit and document listKeys and listStatus consistency
guarantee. Currently, listKeys does not seem to hold any bucket locks and
listStatus seem to only hold keys when retrieving OM key table cache iterator.
During that time, OM DB flush or cache evictions can happen which affect the
list results.
There are concerns raised in HDDS-1986 and HDDS-1987 that seem to be
unaddressed. This includes
* Calling OM DB flush before the list
* Using a generational stamp (shared between cache and DB)
** This might be achieved using updateID (or transactionLogIndex)
* Holding lock during the list
** This will simplify the consistency but will cause large performance hitÂ
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