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https://issues.apache.org/jira/browse/FALCON-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15401388#comment-15401388
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Venkat Ranganathan commented on FALCON-2104:
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How about this. We say that before upgrading to 0.10, one needs to apply a
patch to their current version (say the patch will be available in 0.6.1 or
later and we will include it as part of 0.10).
The patch will introduce one utility which allows the the export to JSON or
import from JSON to the graph db. This can potentially help in downgrade
situations say people move from 0.10 to an earlier release for some reason or
even when moving from berkeleydb to hbase as backend for example.
I am attaching a shell script and the 0.9 patch and a 0.10 patch for Falcon.
Please check
[~bvellanki] Please check the patch - not sure if your utility is along
similar lines - if so, feel free to incorporate as needed
> Loss of data in GraphDB when upgrading Falcon from 0.9 to 0.10.
> ----------------------------------------------------------------
>
> Key: FALCON-2104
> URL: https://issues.apache.org/jira/browse/FALCON-2104
> Project: Falcon
> Issue Type: Bug
> Affects Versions: 0.10
> Reporter: Balu Vellanki
> Assignee: Balu Vellanki
> Priority: Critical
> Fix For: trunk, 0.10
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> FALCON-1333 (Instance Search feature) requires Falcon to use titan-berkeleyje
> version 0.5.4 to support indexing. Up until version 0.9 - Falcon used
> titan-berkeleyje-jre6 version 0.4.2. GraphDB created by version 0.4.2 cannot
> be read by version 0.5.4. When attempting an upgrade, I realized that entity
> and instance lineage data created in 0.9 version could not be read by Falcon
> in 0.10 version.
> The only solution seems to provide a tool to do the following
> - Use 0.4.2 version of titan-berkeleyje-jre6 to read the berkeleyDB based
> graphDB and create a JSON file with all data.
> - shutdown falcon-0.9, upgrade Falcon.
> - use 0.5.4 version of titan-berkeleyje to read JSON file and repopulate
> berkeleyDB based graphDB.
> - restart falcon-0.10
> I will work on the tool, and update release-notes, upgrade instructions
> accordingly.
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