Tobias Bocanegra created JCR-3791:
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             Summary: Add support for "hollow" packages
                 Key: JCR-3791
                 URL: https://issues.apache.org/jira/browse/JCR-3791
             Project: Jackrabbit Content Repository
          Issue Type: Bug
            Reporter: Tobias Bocanegra


when installing the customer package that is 3Gb, I noticed that installing it 
requires about 10Gb...
The root cause seems that it doesn't use the file directly, but instead perform 
multiple copies before actually starting to extract it.
1. it copies the package from crx-quickstart/install to datastore 
2. from datastore if first copy it in /tmp like vaultpack7793665768596308927.zip
3. in /tmp/ it create a second copy __vlttmpbuffer2535888623024233693.dat
So at the end it will have used many diskspace which in the case of large 
package is not efficient.
It could be nice if it would use the original file (datastore or /install 
folder) all the time.

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I think we should have 2 improvements:

# add option for streaming install which would:
** create a "hollow" package, that does not store the package content in the 
repository (basically, a 0 byte jcr:data). I think it's still good to have the 
package node so that you see it was installed
** would not create a snapshot by default
** would not allow to uninstall
** would install directly from the stream, w/o need of tmp file (there might be 
a problem with large zip's that still need a tmp file - but with java7 that 
might not be a problem anymore)
# add option to select a file on the server disk for installation. this can be 
done independent of the "hollow" package support above. but would allow to scp 
the files on the server, and then install it w/o an ever-open browser 
connection.




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