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https://issues.apache.org/jira/browse/OAK-1921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14051055#comment-14051055
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Jukka Zitting commented on OAK-1921:
------------------------------------
In OAK-1932 I adjusted the compaction code so that it can use different
SegmentWriter than the normal one. That should make it easier to directly reuse
the compaction code for this purpose instead of having to maintain a separate
copy of mostly the same functionality.
> Backup: "Attempt to read external blob" error
> ---------------------------------------------
>
> Key: OAK-1921
> URL: https://issues.apache.org/jira/browse/OAK-1921
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segmentmk
> Affects Versions: 1.0, 1.0.1, 1.0.2
> Reporter: Thomas Mueller
> Assignee: Alex Parvulescu
> Attachments: OAK-1921-generic-backup.patch, OAK-1921.patch
>
>
> I tried to backup a segmentstore (with an external BlobStore) using
> {noformat}
> java -mx8g -jar oak-run-1.0.2-SNAPSHOT.jar backup segmentstore s2
> {noformat}
> and got:
> {noformat}
> Attempt to read external blob with blobId
> [c184d2a3f1dbc709004a45ae6c5df7624c2ae653#32768] without specifying BlobStore
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentBlob.getReference(SegmentBlob.java:118)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeBlob(SegmentWriter.java:706)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeProperty(SegmentWriter.java:808)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeProperty(SegmentWriter.java:796)
> {noformat}
> There are two options:
> 1) Adjust the backup code to work like compaction does, i.e. leave
> external blobs as-is and perhaps output a message that informs the
> user about the need to use a different mechanism to back up the
> BlobStore contents
> 2) Add command line options for configuring the BlobStore to be used
> for accessing external blobs.
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