Karsten Otto created JAMES-3799:
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Summary: Optimize memory requirements of SimpleMessageSearchIndex
Key: JAMES-3799
URL: https://issues.apache.org/jira/browse/JAMES-3799
Project: James Server
Issue Type: Improvement
Components: MailStore & MailRepository
Affects Versions: master
Reporter: Karsten Otto
While experimenting some more with the ExpireMailboxService, I noticed that it
uses an unexpectedly high amount of heap memory. I tracked the issue down to
SimpleMessageSearchIndex.searchResults(), which always uses FetchType.FULL when
retrieving messages from the MessageMapper for non-UID searches. Thus it loads
the entire mail into memory, even if it only needs to check the internalDate.
I propose to optimize the fetch type used at this point, so it depends on the
actual requirements of the stated SearchQuery. For most queries, it will only
need to retrieve the mail headers, which typically have a much smaller memory
footprint than mail bodies. For certain cases it may avoid even that if it only
needs the message metadata.
Besides a significant reduction in memory use, I also anticipate a certain
amount of speed improvement when reducing/skipping content retrieval from blob
storage.
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