Reduce WIAB memory footprint
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Key: WAVE-287
URL: https://issues.apache.org/jira/browse/WAVE-287
Project: Wave
Issue Type: Improvement
Components: Server
Reporter: Yuri Zelikov
Assignee: Yuri Zelikov
The excessive footprint can be avoided if the wave server evicts the oldest
deltas from memory, that is, it only keeps the most recent deltas in memory and
loads older deltas from disk only upon request. Since we don't want to perform
any disk operations synchronously under the wavelet lock in the wave store, we
need to make all the methods that access delta history asynchronous.
Specifically, the following methods need to be made asynchronous:
box.server.waveserver.WaveletContainer#requestHistory()
box.server.waveserver.WaveletContainer#requestTransformedHistory()
box.server.waveserver.WaveletProvider#getHistory()
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