Ethan Rose created HDDS-7178:
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Summary: [Multi-tenant] Use optimistic read in Ranger background
sync
Key: HDDS-7178
URL: https://issues.apache.org/jira/browse/HDDS-7178
Project: Apache Ozone
Issue Type: Sub-task
Components: OM
Reporter: Ethan Rose
Assignee: Ethan Rose
Coordination between the background sync and tenant modification requests is
currently done through a stamped lock. The background sync currently holds a
read lock for a short period every time it runs to fetch a consistent view of
OM and Ranger state, however, tenant modifications will be blocked during this
time since they need the write lock.
Since this is already a stamped lock, we can use optimistic read with retries
instead of a read lock in the background sync. This way it will not conflict
with user tenant modifications as long as there is no divergence between OM and
Ranger. If there is divergence, the background sync will still need to push
updates under a write lock, blocking tenant modifications while it does so.
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