George Jahad created HDDS-8499:
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Summary: Add mechanism to notify threads when om double buffer
flush is complete
Key: HDDS-8499
URL: https://issues.apache.org/jira/browse/HDDS-8499
Project: Apache Ozone
Issue Type: Sub-task
Reporter: George Jahad
In order to support bootstrapping followers, the om snapshot subsystem needs to
make consistent copies snapshot, including the deleted keys table which can be
updated at any time.
This means that the background processes modifying the deletedKeys tables need
to be halted, and then the bootstrapping process needs to wait for the double
buffer to be flushed, (so that any remaining mods to the deletedKeys table is
up to date.)
This PR adds the mechanism to allow a thread to wait until the double buffer
has been flushed.
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