Puneet Gupta created LENS-1436:
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Summary: Lens Server's previously persisted state should be backed
up before creating a new persisted state
Key: LENS-1436
URL: https://issues.apache.org/jira/browse/LENS-1436
Project: Apache Lens
Issue Type: Improvement
Components: server
Reporter: Puneet Gupta
As of now lens server state is persisted up every 5 mins . The sate is also
persisted when server is going down.
Consider a scenario where server is running out of memory or all its threads
are blocked and writes a corrupt state while going down. In this case we lose
all the queries and/or session info.
Proposal : before creating a server state snapshot, the previous snapshot
(folder) should be backed up. Now we will have two persisted states, the
current one and backed up state(5 mins old state). If the current state is
corrupt, server can use the backed up state in which case we lose out only on
last 5 mins of state.
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