tElasticSearchInput properties for Apache Spark Batch
These properties are used to configure tElasticSearchInput running in the Spark Batch Job framework.
The Spark Batch tElasticSearchInput component belongs to the ElasticSearch family.
This component is available in all Talend products with Big Data and in Talend Data Fabric.
Basic settings
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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. The schema of the data outputted by this component is read-only, id_document and json_document. The json_document column contains the body of the documents read from ElasticSearch. If you need to explore data from this json_document column, you have to use tExtractJSONFields to extract the data to be used. |
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Use an existing configuration |
Select this check box and in the Component List drop-down list, select the desired connection component to reuse the connection details you already defined. |
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Nodes |
Enter the location of the cluster hosting the Elasticsearch system to be used. |
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Index |
Enter the name of the index you want to read documents from. An index is the largest unit of storage in the Elasticsearch system. |
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Type |
Enter the name of the type the documents to be read belong to. For example, blogpost_en and blogpost_fr can be two types that represent given English blog posts and French blog posts, respectively. You can dynamically uses the values of a given column to be document types. If you need to do so, enter the name of that column into a pair of braces ({}), for example, {blog_author}. |
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Query |
Enter the Elasticsearch query to be performed by this component. In editing queries, you need to use the syntax required by Elasticsearch along with escape characters required by Java, and put the query in double quotation marks. For example, in the Elasticsearch documentation, an example query reads as
follows:
es.query = { "query" : { "term" : { "user" : "costinl" } } }
In this Query field, you should write the same query in
the following
way:
"{ \"query\" : { \"term\" : {\"user\" : \"costinl\" } } }"
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Advanced settings
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Use SSL/TLS |
Select this check box to enable the SSL or TLS encrypted connection. Then you need to use the tSetKeystore component in the same Job to specify the encryption information. |
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Configuration |
Add the parameters accepted by Elasticsearch to perform more customized actions. For example, enter es.mapping.id in the Key column and true in the Value column to make the document field/property name contain the document ID. Note that you must put double quotation marks around the entered information. For a list of the parameters you can use, see https://www.elastic.co/guide/en/elasticsearch/hadoop/master/configuration.html. |
Usage
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Usage rule |
This component is used as a start component and requires an output link. Place a tElasticSearchConfiguration
component in the same Job to connect to Elasticsearch. Then you need to select the Use an existing configuration check box and then select the
tElasticSearchConfiguration component to be used.
This component, along with the Spark Batch component Palette it belongs to, appears only when you are creating a Spark Batch Job. Note that in this documentation, unless otherwise explicitly stated, a scenario presents only Standard Jobs, that is to say traditional Talend data integration Jobs. |
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Spark Connection |
In the Spark
Configuration tab in the Run
view, define the connection to a given Spark cluster for the whole Job. In
addition, since the Job expects its dependent jar files for execution, you must
specify the directory in the file system to which these jar files are
transferred so that Spark can access these files:
This connection is effective on a per-Job basis. |