# tMapRDBOutput Standard properties These properties are used to configure tMapRDBOutput running in the Standard Job framework. The Standard tMapRDBOutput component belongs to the Big Data and the Databases NoSQL families. The component in this framework is available in all Talend products with Big Data and in Talend Data Fabric. ## Basic settings | Property type | Either Built-In or Repository.

Built-In: No property data stored centrally.

Repository: Select the repository file where the
properties are stored. | | --- | --- | | Use an existing connection | Select this check box and in the Component List click the relevant connection component to
reuse the connection details you already defined. | | Distribution and
Version | Select the MapR distribution to be used. Only MapR V5.2 onwards is supported
by the MapRDB components.

If the distribution you need to use with your MapRDB database is not
officially supported by this MapRBD component, that is to say, this distribution is MapR
but is not listed in the Version drop-down list of
this components or this distribution is not MapR at all, select Custom.

Select Import from existing version to import an officially supported distribution as base and then add other required jar files which the base distribution does not provide.
Select Import from zip to import the configuration zip for the custom distribution to be used. This zip file should contain the libraries of the different Hadoop elements and the index file of these libraries.

In Talend Exchange, members of Talend community have shared some ready-for-use configuration zip files which you can download from this Hadoop configuration list and directly use them in your connection accordingly. However, because of the ongoing evolution of the different Hadoop-related projects, you might not be able to find the configuration zip corresponding to your distribution from this list; then it is recommended to use the Import from existing version option to take an existing distribution as base to add the jars required by your distribution.

Note that custom versions are not officially supported by Talend . Talend and its community provide you with the opportunity to connect to custom versions from the Studio but cannot guarantee that the configuration of whichever version you choose will be easy, due to the wide range of different Hadoop distributions and versions that are available. As such, you should only attempt to set up such a connection if you have sufficient Hadoop experience to handle any issues on your own.

Information noteNote:
In this dialog box, the active check box must be kept selected so as to import the jar files pertinent to the connection to be created between the custom distribution and this component.

For a step-by-step example about how to connect to a custom distribution and share this connection, see .

| | Hadoop version of the
distribution | This list is displayed only when you have selected Custom from the distribution list to connect to a cluster not yet
officially supported by the Studio. In this situation, you need to select the Hadoop
version of this custom cluster, that is to say, Hadoop
1 or Hadoop 2. | | Zookeeper quorum | Type in the name or the URL of the Zookeeper service you use to coordinate the transaction
between your Studio and your database. Note that when you configure the Zookeeper, you might
need to explicitly set the *zookeeper.znode.parent*
property to define the path to the root znode that contains all the znodes created and used
by your database; then select the Set Zookeeper znode
parent check box to define this property. | | Zookeeper client port | Type in the number of the client listening port of the Zookeeper service you are
using. | | Use kerberos authentication | If the database to be used is running with Kerberos security, select this
check box, then, enter the principal names in the displayed fields. You should be
able to find the information in the *hbase-site.xml* file of the
cluster to be used.

If this cluster is a MapR cluster of the version 5.0.0 or later, you can set the MapR ticket authentication configuration in addition or as an alternative by following the explanation in Connecting to a security-enabled MapR.

Keep in mind that this configuration generates a new MapR security ticket for the username defined in the Job in each execution. If you need to reuse an existing ticket issued for the same username, leave both the Force MapR ticket authentication check box and the Use Kerberos authentication check box clear, and then MapR should be able to automatically find that ticket on the fly.

If you need to use a Kerberos keytab file to log in, select Use a keytab to authenticate. A keytab file contains
pairs of Kerberos principals and encrypted keys. You need to enter the principal to
be used in the Principal field and the access
path to the keytab file itself in the Keytab
field. This keytab file must be stored in the machine in which your Job actually
runs, for example, on a Talend
Jobserver.

Note that the user that executes a keytab-enabled Job is not necessarily
the one a principal designates but must have the right to read the keytab file being
used. For example, the user name you are using to execute a Job is *user1* and the principal to be used is *guest*; in this
situation, ensure that *user1* has the right to read the keytab
file to be used. | | Schema and Edit
schema | A schema is a row description. It defines the number of fields
(columns) to be processed and passed on to the next component. When you create a Spark
Job, avoid the reserved word line when naming the
fields.

Click Edit
schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

View schema: choose this option to view the schema only.
Change to built-in property: choose this option to change the schema to Built-in for local changes.
Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

| | | Built-In: You create and store the schema locally for this component
only. | | | Repository: You have already created the schema and stored it in the
Repository. You can reuse it in various projects and Job designs.

When the schema to be reused has default values that are
integers or functions, ensure that these default values are not enclosed within
quotation marks. If they are, you must remove the quotation marks manually.

For more information, see the related
description of retrieving table schemas in Talend Studio User Guide. | | Set table Namespace mappings | Enter the string to be used to construct the mapping between an Apache HBase table and a
MapR table.

For the valid syntax you can use, see http://doc.mapr.com/display/MapR40x/Mapping+Table+Namespace+Between+Apache+HBase+Tables+and+MapR+Tables. | | Table name | Type in the name of the HBase table you need to create. | | Action on table | Select the action you need to take for creating a table. | | Custom Row Key | Select this check box to use the customized row keys. Once selected, the corresponding
field appears. Then type in the user-defined row key to index the rows
of the table being created.

For example, you can type in
"France"+Numeric.sequence("s1",1,1) to produce the
row key series: *France1*,
*France2*, *France3* and so on. | | Families | Complete this table to specify the column or columns to be created
and the corresponding column family or families they belong to
respectively. The Column column of
this table is automatically filled once you have defined the
schema. | | Die on error | This check box is cleared by default, meaning to skip the row on
error and to complete the process for error-free rows. | ## Advanced settings | Use batch mode | Select this check box to activate the batch mode for data processing. | | --- | --- | | Batch size | Specify the number of records to be processed in each batch.

This field appears only when the Use batch mode
check box is selected. | | Properties | If you need to use custom configuration for your database, complete this table with the
property or properties to be customized. Then at runtime, the customized property or
properties will override the corresponding ones used by the Studio.

For example, you need to define the value of the *dfs.replication* property as *1* for the
database configuration. Then you need to add one row to this table using the plus button and
type in the name and the value of this property in this row.

Information noteNote:

This table is not available when you are using an existing
connection by selecting the Using an
existing connection check box in the Basic settings view. | | tStatCatcher Statistics | Select this check box to collect log data at the component
level. | | Family parameters | Type in the names and, when needs be, the custom performance options of the column
families to be created. This feature leverages attributes defined by the
HBase data model, so for further explanation about these options, see
Apache HBase documentation.

Information noteNote: The parameter Compression type allows you to select the
format for output data compression. | ## Global Variables | Global Variables | NB\_LINE: the number
of rows read by an input component or transferred to an output component. This is an
After variable and it returns an integer.

ERROR\_MESSAGE: the error message generated by the component when an
error occurs. This is an After variable and it returns a string. This variable functions
only if the Die on error check box
is cleared, if the component has this check
box.

A Flow variable functions during the execution of a component
while an After variable functions after the execution of the component.

To fill up a field or expression with a
variable, press Ctrl + Space to
access the variable list and choose the variable to use from it.

For further information about variables, see *Talend Studio*
*User Guide*. | | --- | --- | ## Usage | **Usage rule** | This component is normally an end component of a Job and always
needs an input link. | | --- | --- | | Prerequisites | Before starting, ensure that you have met the Loopback IP prerequisites expected by your
database.

The Hadoop distribution must be properly installed, so as to guarantee the interaction
with *Talend Studio*. The following list presents MapR related information for
example.

Ensure that you have installed the MapR client in the machine where the Studio is, and added the MapR client library to the PATH variable of that machine. According to MapR's documentation, the library or libraries of a MapR client corresponding to each OS version can be found under MAPR_INSTALL\ hadoop\hadoop-VERSION\lib\native. For example, the library for Windows is \lib\native\MapRClient.dll in the MapR client jar file. For further information, see the following link from MapR: http://www.mapr.com/blog/basic-notes-on-configuring-eclipse-as-a-hadoop-development-environment-for-mapr.

Without adding the specified library or libraries, you may encounter the following error: no MapRClient in java.library.path.
Set the -Djava.library.path argument, for example, in the Job Run VM arguments area of the Run/Debug view in the Preferences dialog box in the Window menu. This argument provides to the Studio the path to the native library of that MapR client. This allows the subscription-based users to make full use of the Data viewer to view locally in the Studio the data stored in MapR.

For further information about how to install a Hadoop distribution, see the manuals
corresponding to the Hadoop distribution you are using. |