The TIBCO StreamBase® Delete Adapter for Apache HBase allows the system to delete rows from the HBase database. The adapter uses property values in the sbd.sbconf configuration file to set up the HBase connection. For details, see Configuration File Settings below. Multiple HBase adapters can share a single instance of the HBase connection by selecting the same HBase configuration setting.
The TIBCO StreamBase® Adapter for Apache HBase is implemented as a suite of five global Java operators, including the HBase Admin, Delete, Get, Put, and Scan operators.
This page describes the HBase Delete operator, which allows a StreamBase application to delete rows from a connected HBase database table. The operator uses property values in the project's server configuration file to set up the connection to the HBase database, as described in Configuration File Settings. Multiple HBase operators can share a single instance of an HBase connection by selecting the same HBase configuration setting ID.
This section describes the configuration for an HBase database connection instance that you specify in your project's sbconf file. This configuration is the same for all HBase operator types.
The <adapter-configurations> element of a project's sbconf file, despite its name, is used to specify configuration value groups for either operators
or adapters.
The HBase configuration section of the sbconf file starts with an <adapter-configurations> element that contains one <adapter-configuration name="hbase"> element. This element, in turn, contains one or more <setting> elements.
Each <section name="hbase"> element must contain one element in the form <setting name="id" val=", where HBaseConfigName"/>HBaseConfigName is the name you assign to a group of settings that uniquely define an individual HBase database connection. All other <setting> elements are optional.
The example configuration below shows a basic configuration to connect to an HBase server. You can have as many configurations
as your application requires, but each configuration must have a unique id.
Example 1. Example <adapter-configuration> Section for HBase
<adapter-configurations>
<adapter-configuration name="hbase">
<section name="hbase">
<setting name="id" val="HBase Sample"/>
<setting name="connectAtStartup" val="true" />
<!-- All values below are passed directly to the
HBaseConfiguration class unmodified --/>
<setting name="hbase.master" val="127.0.0.1:60000" />
<setting name="hbase.zookeeper.quorum" val="127.0.0.1" />
<setting name="hbase.zookeeper.property.clientPort" val="2181" />
<setting name="hbase.client.retries.number" val="5" />
<setting name="zookeeper.session.timeout" val="5000" />
<setting name="zookeeper.recovery.retry" val="5" />
</section>
</adapter-configuration>
</adapter-configurations>| Setting | Type | Description |
|---|---|---|
| id | string | The value of the id setting displays in the drop-down list in the adapter's Properties view, and is used to uniquely identify this section of
the configuration file.
|
| connectAtStartup | true or false | If true, this operator instance connects to HBase on startup of this operator's containing module. |
| *** | string | All other values are directly sent to the HBaseConfiguration class, which is responsible for setting up a connection to the HBase server. See the Apache HBase documentation for the available client configuration options and for further information on setting up a connection to HBase. |
This section describes the properties you can set for an HBase Delete operator, using the various tabs of the Properties view in StreamBase Studio.
Name: Use this field to specify or change the component's name, which must be unique in the application. The name must contain only alphabetic characters, numbers, and underscores, and no hyphens or other special characters. The first character must be alphabetic or an underscore.
Operator: A read-only field that shows the formal name of the operator.
Class: A field that shows the fully qualified class name that implements the functionality of this operator. Use this class name when loading the operator in StreamSQL programs with the APPLY JAVA statement. You can right-click this field and select Copy from the context menu to place the full class name in the system clipboard.
Start with application: If this field is set to Yes or to a module parameter that evaluates to true, an instance of this operator starts as part of the containing StreamBase Server. If this field is set to No or to a module parameter that evaluates to false, the adapter is loaded with the server, but does not start until you send an sbadmin resume command, or until you start the component with StreamBase Manager. With this option set to No or false, the operator does not start even if the application as a whole is suspended and later resumed. The recommended setting is selected by default.
Enable Error Output Port: Select this check box to add an Error Port to this component. In the EventFlow canvas, the Error Port shows as a red output port, always the last port for the component. See Using Error Ports and Error Streams to learn about Error Ports.
Description: Optionally enter text to briefly describe the component's purpose and function. In the EventFlow canvas, you can see the description by pressing Ctrl while the component's tooltip is displayed.
| Property | Type | Description |
|---|---|---|
| HBase Config | drop-down list | The name of the HBase configuration to use with this operator. The value selected by this drop-down list determines the database connection this operator works against. The values that populate this list are stored in the project's sbconf file, as described in the Configuration File Settings section. |
| Table Name | string | The HBase table that this operation is to be performed against. |
| Row Id Field Name | string | The field in the inbound schema which represents the field which contains the Row Id to delete. |
| Enable Status Port | check box | If enabled, a status port is made available for this operator instance, which will emit status tuples for various events from this operator. |
| Log Level | Drop-down list | Controls the level of verbosity the adapter uses to issue informational traces to the console. This setting is independent of the containing application's overall log level. Available values, in increasing order of verbosity, are: OFF, ERROR, WARN, INFO, DEBUG, TRACE, and ALL. |
Use the Concurrency tab to specify parallel regions for this instance of this component, or multiplicity options, or both. The Concurrency tab settings are described in Concurrency Options, and dispatch styles are described in Dispatch Styles.
Caution
Concurrency settings are not suitable for every application, and using these settings requires a thorough analysis of your application. For details, see Execution Order and Concurrency, which includes important guidelines for using the concurrency options.