8.2. Schema Commands¶
These commands are used to create, describe and delete schemas (SimpleFeatureTypes). Required
parameters are indicated with a *.
8.2.1. create-schema¶
Used to create a new SimpleFeatureType.
Argument |
Description |
|---|---|
|
The catalog table used to hold the schema metadata |
|
The |
|
The name of the schema to create |
|
The attribute to use for the default date field |
The --spec argument may be any of the following:
A string of attributes, for example
name:String,dtg:Date,*geom:Point:srid=4326The name of a
SimpleFeatureTypealready available on the classpathA string of attributes, defined as a TypeSafe configuration
The name of a file containing one of the above
See Defining Simple Feature Types for more details on specifying the SimpleFeatureType.
The --feature-name attribute is required if it is not implied by the specification string.
It may also be used to override the implied feature name.
8.2.2. delete-catalog¶
Deletes all SimpleFeatureTypes in a given catalog, and all features associated with them.
Argument |
Description |
|---|---|
|
The catalog table used to hold the schema metadata |
8.2.3. describe-schema¶
Describes the attributes of an existing SimpleFeatureType.
Argument |
Description |
|---|---|
|
The catalog table containing the schema metadata |
|
The name of the schema to describe |
8.2.4. gen-avro-schema¶
Generate an Avro schema based on a SimpleFeatureType.
Argument |
Description |
|---|---|
|
The |
|
The name of the schema to create |
|
Encode list and map type attributes as native Avro records |
|
Exclude the feature ID, which aligns with the schema used for GeoMesa Kafka topics |
See create-schema for details on specifying a SimpleFeatureType.
8.2.5. get-sft-config¶
Exports the SimpleFeatureType metadata.
Argument |
Description |
|---|---|
|
The catalog table used to hold the schema metadata |
|
The name of the schema to export |
|
The format to output - either |
|
Export the metadata with minimal whitespace |
|
Exclude user data from the output |
The metadata can either be exported as a specification string, or as a TypeSafe
configuration file. See Defining Simple Feature Types for more details on SimpleFeatureType
formats.
8.2.6. get-type-names¶
Displays the names of SimpleFeatureTypes stored in a given catalog table.
Argument |
Description |
|---|---|
|
The catalog table containing schema metadata |
8.2.7. manage-partitions¶
This command will list, add and delete partitioned tables used by GeoMesa. It has four sub-commands:
list- list the partitions for a given schemaadd- create new partitionsadopt- adopt an existing table as a partitiondelete- delete existing partitionsname- display the partition name associated with an attribute (i.e. date)
To invoke the command, use the command name followed by the sub-command, then any arguments. For example:
$ geomesa manage-partitions list -c myCatalog ...
Argument |
Description |
|---|---|
|
The catalog table containing schema metadata |
|
The name of the schema |
8.2.7.1. list¶
The list sub-command will print out the current partitions for a schema.
8.2.7.2. add/delete¶
The add and delete sub-commands will add or delete partitions, respectively. The add command
will create new tables as necessary, while the delete command will drop tables.
Argument |
Description |
|---|---|
|
The name of the partition to add or delete. May be specified multiple times to operate on multiple partitions |
|
Force deletion of partitions without confirmation prompt (delete only) |
To determine the appropriate partition name, use the name sub-command.
8.2.7.3. adopt¶
The adopt sub-command will add an existing table as a partition. The new table must have the same
schema as the existing feature type. This command is useful to migrate from a non-partitioned
feature type to a partitioned one - the old (non-partitioned) tables can be adopted into the new feature type.
Argument |
Description |
|---|---|
|
The name of the partition to adopt. Name must be unique across all partitions for the feature type |
|
The name of the index table(s) to adopt. Each index in the
feature type (e.g. |
|
A value used to specify the bounds of the partition, for
example a date partition might use
|
8.2.7.4. name¶
The name sub-command will display the partition name associated with a particular date. The partition
names are required when adding or deleting partitions.
Argument |
Description |
|---|---|
|
The date for the partition, in the form
|
8.2.8. remove-schema¶
Deletes a SimpleFeatureType, and all features associated with it.
Argument |
Description |
|---|---|
|
The catalog table used to hold the schema metadata |
|
The name of the schema to delete |
|
A regular expression matching the schemas to delete |
|
Delete any matching schemas without prompting for confirmation |
The schema can either be specified by name, or a regular expression can be used to delete multiple schemas at once.
8.2.9. update-schema¶
Alter an existing SimpleFeatureType. This command can be used to rename a schema, rename attributes,
append additional attributes, and modify keywords.
The schema metadata will be backed up before it is updated, generally in a newly created table. If there is an error during the update, the backup can be used to restore the previous state.
Warning
To ensure data integrity, all GeoMesa clients should be stopped before updating a schema, and restarted once the update is complete. In limited circumstances, clients can continue to run during the update, and they will pick up any modifications on the fly after a few minutes - however, it is safest to stop and restart them.
Argument |
Description |
|---|---|
|
The catalog table used to hold the schema metadata |
|
The name of the schema to operate on |
|
Change the name of the feature type |
|
Change the name of an existing attribute |
|
Add a new attribute (column) to the feature type |
|
Enable or disable stats for the feature type |
|
Add a new keyword to the feature type user data |
|
Delete an existing keyword from the feature type user data |
|
Add or update an entry in the feature type user data |
|
When renaming the feature type, update index tables to match |
|
Disable backing up the schema before the update |
The --rename parameter can be used to change the type name of the schema. The --rename-attribute
parameter can be used to rename an attribute, by specifying the old name and the new name.
When renaming, the --rename-tables flag can be used to alter any index tables to match the new name(s),
but be aware that this can be a costly operation in some data stores.
The add-attribute parameter can be used to append additional columns to the end of the schema definition.
Columns should be defined in the standard GeoTools specification format, for example myColumn:String:index=true.
See GeoTools Feature Types for more information on column types. Any features that have already been written will
have a null value for the new columns. When adding columns that are attribute-indexed, the index will initially
be empty.
The enable-stats parameter can be used to permanently enable or disable cached statistics for the feature type.
See Configuring Cached Statistics for more details on cached statistics.
The --add-keyword and --remove-keyword parameters can be used to add and/or remove keywords in the
user data of the schema. When adding a layer in GeoServer, the ‘Keywords’ section of the layer configuration page
will be automatically populated with the user data keywords.
The --add-user-data parameter can be used to add or update any user data key. See Index Configuration for
some examples of configurable values. Entries can be specified as <key>:<value>.
Warning
Be careful changing user data values. Incorrect values can make a schema unreadable. If this happens, the original configuration can usually be restored from a backup table that is created automatically before the update operation.
Note that multiple attributes, user data, and/or keywords can be added/removed/renamed at once by specifying the parameters multiple times.