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https://issues.apache.org/jira/browse/NIFI-32?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Zhurakousky resolved NIFI-32.
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Resolution: Resolved
> Swap File format should include summary at end for faster NiFi system startup
> -----------------------------------------------------------------------------
>
> Key: NIFI-32
> URL: https://issues.apache.org/jira/browse/NIFI-32
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Minor
> Fix For: 1.1.0
>
>
> When NiFi is restarted with many hundreds or thousands of Swap Files, it can
> take a very long time to startup.
> If when we write out the Swap Files, we append a summary of the Swap File
> (queue identifier, number of FlowFiles, size of FlowFiles, and ContentClaim
> info/count map), we can then read far less data for restart. This means we
> would serialize the summary to a ByteArrayOutputStream, then get the length,
> and then write out the summary, followed by length. On restore, we read just
> the last 8 bytes, and that allows us to generate the offset into the file to
> start reading the summary.
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