1.4.3 - Adding your own partition resp. suffix¶
This section describes how to add your own data partition.
What are partitions?¶
In ApacheDS entries are stored in partitions. Each partition contains a complete entry tree, also referred to as a DIT. Multiple partitions may exist and the entry trees they contain are disconnected from each other, meaning that changes to entries in partition A would never affect entries in partition B. The entries in a particular partition are stored below some naming context called the partition suffix.
The default implementation of partitions is based on JDBM B+Trees (but it's possible to add custom partition implementations). The ApacheDS default configuration contains a a data partition with the suffix "dc=example,dc=com". The image below shows the suffixes of a freshly installed ApacheDS within Apache Directory Studio.
The schema subsystem and ApacheDS itself store their information in special partitions, "ou=schema", "ou=config" and "ou=system" respectively.
Minimal partition definition¶
For the examples in the following sections, we want to add a partition with the suffix "o=sevenSeas". This requires editing of the configuration, and injecting a first entry, associated with the root of this partition (here, "o=sevenseas"). This can be done using Apache Directory Studio. Open the server configuration :
and select the Partitions tab :
Add another jdbmPartition element for the sevenSeas partition, just below the example partition:
As you can see, we have modified the ID and the Suffix, all the other parameters remaining to their default values.
Save the configuration now, and restart the server.
The server has a new suffix now, but no context entry has been created for it. If you connect with an LDAP Browser (Apache Directory Studio for instance), the partition is only visible in the Root DSE. Below the Entry Editor of Directory Studio for the Root DSE after connecting to an ApacheDS instance configured like above.
Before using the partition (e.g. adding entries), you have to add a context entry. If you plan to load LDIF data to your partition anyway, simply provide the context entry (the "root" of your partition) as a first data set. In our example it might look like this:
dn: o=sevenSeas o: sevenSeas objectClass: top objectClass: organization description: The context entry for suffix o=sevenSeas
It is also possible to import a file to ApacheDS which only contains such an entry, of cause. Here is an example on how to procede for the seven seas :
In the LDAP Browser of Directory Studio, right click on the DIT entry and select "Import -> LDIF Import...". A file selections dialog appears. Browse to the LDIF file and click Finish. The entry (or entries, if you provide more of them) will be added to to partition.
The following image depicts the partitions after reconnecting with Apache Directory Studio (LDAP Browser view).
Adding a partition programmatically¶
The same o=sevenseas partition can be created through the application code using the Partition and DirectoryService API
Here is the sample code to create a new partition o=sevenseas and its context entry programmatically
// Get the SchemaManager, we need it for this addition SchemaManager schemaManager = directoryService.getSchemaManager(); // Create the partition JdbmPartition sevenseasPartition = new JdbmPartition( schemaManager ); sevenseasPartition.setId("sevenseas"); Dn suffixDn = new Dn( schemaManager, "o=sevenseas" ); sevenseasPartition.setSuffix( suffixDn ); sevenseasPartition.setCacheSize(1000); sevenseasPartition.init(directoryService); sevenseasPartition.setPartitionPath( <a path on your disk> ); // Create some indices (optional) sevenseasPartition.addindex( new JdbmIndex( "objectClass", false ) ); sevenseasPartition.addindex( new JdbmIndex( "o", false ) ); // Initialize the partition sevenseasPartition.initialize(); // create the context entry Entry contextEntry = new DefaultEntry( schemaManager, "o=sevenseas", "objectClass: top", "objectClass: organization", "o: sevenseas" ); // add the context entry sevenseasPartition.add( new AddOperationContext( null, entry ) ); // We are done !
More configuration options for a JDBM partition¶
Here is a list of the used attributes, their default values and meaning :
|ads-partitionId||Uniquely identifies the partition||N/A||yes|
|ads-partitionSuffix||A DN ("o=sevenseas"), for instance||N/A||yes|
|ads-contextEntry||The context entry||Will be automatically deduced if no value is provided||no|
|ads-optimizerEnabled||Tells the server to turn on the optimizer||true||no|
|ads-partitionCacheSize||The cache size (only for JDBM partitions)||-1 (no cache)||no|
|ads-partitionSyncOnWrite||Syncs disks on every write operation||true||no|