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  • 'binaries' directory that contains the repository "content" binaries stored in a pair-tree like structure. The filename of the binary is the SHA-1 of the content with the extension '.bin'. The directory structure in which each binary is found is three levels deep based on the SHA-1.

    • For example, binary content in the repository with a SHA-1 of "5613537644c4d081c1dc3530fdb1a2fe843e570170d3d054", would look like 

      No Format
      ├── binaries
    └── 44
        └── c4
            └── d0
                └── 44c4d081c1dc3530fdb1a2fe843e570170d3d054.bin


  • One or more "documents_00000n.bin.gz" files which contains a concatenated listing of the metadata for each of the repository objects in JSON format

    • For example 

      No Format
      { "metadata" : 
  { "id" : "87a0a8c317f1e7/jcr:system/jcr:nodeTypes/nt:unstructured//undefined/1" , 
    "contentType" : "application/json" } ,
  "content" : 
  { "key" : "87a0a8c317f1e7/jcr:system/jcr:nodeTypes/nt:unstructured//undefined/1" ,
    "parent" : "87a0a8c317f1e7/jcr:system/jcr:nodeTypes/nt:unstructured" , 
    "properties" : 
    { "http://www.jcp.org/jcr/1.0" : 
      { "primaryType" : 
        { "$name" : "nt:propertyDefinition" } , 
        "onParentVersion" : "COPY" , 
        "multiple" : false , 
        "protected" : false , 
        "availableQueryOperators" : 
          [ "jcr.operator.equal.to" , 
            "jcr.operator.greater.than" , 
            "jcr.operator.greater.than.or.equal.to" , 
            "jcr.operator.less.than" , 
            "jcr.operator.less.than.or.equal.to" , 
            "jcr.operator.like" , 
            "jcr.operator.not.equal.to" ] , 
        "requiredType" : "UNDEFINED" , 
        "mandatory" : false , 
        "autoCreated" : false } 
    } 
  } 
}


Filesystem Backup

By default, files larger than 4KB are stored on disk named after their SHA1 digest, in the directory fcrepo.binary.directory. (4KB is the default, but can be changed by updating the  minimumBinarySizeInBytes property in Deploying Fedora 4 Complete Guide repository.json).  That is, a file with the SHA1 "a1b2c369563c0465ab82cdb2789d45ce1c3585b1" would be stored on disk in /path/to/fcrepo4-data/fcrepo.binary.directory/a1/b2/c3/a1b2c369563c0465ab82cdb2789d45ce1c3585b1.  So files in the repository can be backed up backing up the directory  fcrepo.binary.directory.