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File System

Before you start Fluree for the first time, the contents of the Fluree directory will be as follows (might be slightly different based on your version):

fluree-0.15.0/
├── fluree_sample.properties
├── fluree_start.sh
├── fluree_server.jar
├── logback.xml
├── CHANGELOG.md
├── VERSION
└── LICENSE

Key Files​

  • fluree_sample.properties - File that specifies the customizable Fluree properties.
  • fluree_start.sh - Shell script to launch Fluree.
  • fluree_server.jar - Fluree packaged into a JAR file.
  • logback.xml - Fluree logging options. To change logging options see the Logback library documentation.

After Fluree successfully starts for the first time, if you are using the default fdb-storage-type set to file, there will be additional items in your Fluree instance folder. Your folder will look something like the below:

fluree-0.15.0/
├── data/
├── fluree_sample.properties
├── VERSION
├── fluree_start.sh
├── fluree_server.jar
├── default_private_key.txt
├── logback.xml
├── CHANGELOG.md
└── LICENSE

New Items​

  • data/
  • default_private_key.txt

data/​

The new data folder will contain all of your block data, consensus logs, as well as ledger indexes. This folder can be moved or copied to a different Fluree instance folder and run from the folder if you choose. This is a good option if you want to use a newer Fluree version, but to keep all of your previous ledgers.

default_private_key.txt​

This file contains the default private key for your ledgers. A new (and unique) private key is generated every time you start up a new network, unless you already have a valid private key in default_private_key.txt.

Reset Fluree​

To completely reset your Fluree instance (erasing ALL ledger and transactor group data), you can shut down your instance and delete data/ and default_private_key.txt. Don't do this unless you are sure you want to completely delete everything!

Block Files and Index Files​

Block files and indexes are stored in the folder listed in your settings as fdb-storage-file-directory.

This folder can be moved or copied to a different Fluree instance folder and run from the folder if you choose. This is a good option if you want to use a newer Fluree version, but to keep all of your previous ledgers.

Block files are never overwritten. For example, when the transactions for block 2 are issued, they will be written to a file for block 2 and never modified. If using versioned blocks (see Mutable Fluree), block files may be renamed.

There are four different types of indexes that are written to file. These indexes sort flakes by:

  • subject-predicate-object-time : all flakes written to this index
  • predicate-subject-object-time : all flakes written to this index
  • object-predicate-subject-time : only references and tags are written to this index
  • predicate-object-subject-time : indexed predicates are written to this index

The frequency at which new index files are written depends on your ledger configuration, specifically, the fdb-memory-reindex option.