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https://issues.apache.org/jira/browse/FALCON-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400526#comment-15400526
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Srikanth Sundarrajan commented on FALCON-2104:
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{quote}
The data storage format of Titan 0.5.0 is incompatible with previous releases.
The 0.5.0 release does not yet include utilities to automatically convert data
stored with previous releases. This is planned for the 0.5.1 release. If a data
upgrade is desired before this release, it is encouraged to attempt an export
from the old version using the graphson format and import it into a new Titan
0.5.0 graph using Faunus/Titan-Hadoop.
{quote}
>From the note above it looks like the titan team planned to build a migration
>tool with 0.5.1, did they get to it ? If they did, it will save us the trouble
>and also allow us to move forward with this much awaited release.
> 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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