WSO2 DAS introduces the ability to have a pluggable Data Access Layer (DAL). The DAL's configuration can be found at <DAS_HOME>/repository/conf/analytics/analytics-config.xml. An example is shown below.
<analytics-dataservice-configuration>
<!-- The name of the primary record store -->
<primaryRecordStore>EVENT_STORE</primaryRecordStore>
<!-- Analytics Record Store - properties related to record storage implementation -->
<analytics-record-store name="EVENT_STORE">
<implementation>org.wso2.carbon.analytics.datasource.rdbms.RDBMSAnalyticsRecordStore</implementation>
<properties>
<property name="datasource">WSO2_ANALYTICS_EVENT_STORE_DB</property>
<property name="category">large_dataset_optimized</property>
</properties>
</analytics-record-store>
<analytics-record-store name="PROCESSED_DATA_STORE">
<implementation>org.wso2.carbon.analytics.datasource.rdbms.RDBMSAnalyticsRecordStore</implementation>
<properties>
<property name="datasource">WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB</property>
<property name="category">large_dataset_optimized</property>
</properties>
</analytics-record-store>
<!-- The data indexing analyzer implementation -->
<analytics-lucene-analyzer>
<implementation>org.apache.lucene.analysis.standard.StandardAnalyzer</implementation>
</analytics-lucene-analyzer>
<!-- The maximum number of threads used for indexing per node, -1 signals to aute detect the optimum value,
where it would be equal to (number of CPU cores in the system - 1) -->
<indexingThreadCount>-1</indexingThreadCount>
<!-- The number of index shards, should be equal or higher to the number of indexing nodes that is going to be working,
ideal count being 'number of indexing nodes * [CPU cores used for indexing per node]' -->
<shardCount>6</shardCount>
<!-- The number of batch index records, the indexing node will process per each indexing thread. A batch index record basically
encapsulates a batch of records retrieved from the receiver to be indexed -->
<shardIndexRecordBatchSize>100</shardIndexRecordBatchSize>
<!-- Data purging related configuration -->
<analytics-data-purging>
<!-- Below entry will indicate purging is enable or not. If user wants to enable data purging for cluster then this property
need to be enable in all nodes -->
<purging-enable>false</purging-enable>
<cron-expression>0 0 0 * * ?</cron-expression>
<!-- Tables that need include to purging. Use regex expression to specify the table name that need include to purging.-->
<purge-include-tables>
<table>.*</table>
<!--<table>.*jmx.*</table>-->
</purge-include-tables>
<!-- All records that insert before the specified retention time will be eligible to purge -->
<data-retention-days>365</data-retention-days>
</analytics-data-purging>
<!-- Receiver/Indexing flow-control configuration -->
<analytics-receiver-indexing-flow-control enabled="true">
<!-- maximum number of records that can be in index staging area before receiving is throttled -->
<recordReceivingHighThreshold>10000</recordReceivingHighThreshold>
<!-- the limit on number of records to be lower than, to reduce throttling -->
<recordReceivingLowThreshold>5000</recordReceivingLowThreshold>
</analytics-receiver-indexing-flow-control>
</analytics-dataservice-configuration>
Analytics Record Store
The Analytics Record Store is the section that handles the storing of records that are received by WSO2 DAS in the form of events. This store contains raw data relating to events in a tabular form to be retrieved later.
The following record stores are configured in the <DAS_HOME>/repository/conf/analytics/analytics-config.xml file by default.
| Record Store Type | Default Name | Description |
|---|---|---|
| Primary Store | EVENT_STORE | This record store is used to store the persisted incoming events of WSO2 DAS. It contains raw data in a tabular structure which can be used later. |
| Processed Data Store. | PROCESSED_DATA_STORE | This record store is used to store summarised event data. |
Configuring a record store
The following is a sample configuration of a record store.
<analytics-record-store name="EVENT_STORE">
<implementation>org.wso2.carbon.analytics.datasource.rdbms.RDBMSAnalyticsRecordStore</implementation>
<properties>
<property name="datasource">WSO2_ANALYTICS_EVENT_STORE_DB</property>
<property name="category">large_dataset_optimized</property>
</properties>
</analytics-record-store>
The following needs to be specified for each record store.
- Name: A unique name for the record store.
- Implementation: This specifies the implementation for the record store. For the record store to function, the provider for the datasource type mentioned in this implementation should be enabled in the
<DAS_HOME>/repository/conf/datasources/analytics-datasources.xmlfile. Record store specific properties: The properties that are defined per record store are described in the table below.
Property Description datasourceThe name of the datasource used to connect to the database used by the record store.
Once a record store is configured in the analytics-config.xml file, you can select it as the record store for the required event streams. For more information, see Persisting Data for Interactive Analytics.
Analytics Indexing
By default, WSO2 DAS executes indexing operation when the server is started. The following system property can be used to disable the indexing operations if required.
- For Windows:
wso2server.bat -DdisableIndexing - Fow Linux:
wso2server.sh -DdisableIndexing
This option allows you to create servers that are dedicated for specific operations such as event receiving, analytics, indexing, etc.
Configuring common parameters
The following parameters are common for both the Analytics Record Store and the Analytics File System
Data purging parameters
| Parameter | Description | Default Value |
|---|---|---|
<purging-enable> | This parameter specifies whether the functionality to purge data from event tables is enabled or not. | false |
<cron-expression> | A regex expression to select the tables from which data should be purged. | 0 0 0 * * ? |
<purge-include-tables> | A list of event tables from which data should be purged can be defined as subelements of this element. | |
<data-retention-days> | The number of days for which the data should be retained in the event tables that were selected to have their data purged. All the data in these tables are cleared once the number of days that equal the value specified for this parameter have elapsed. | 365 |
Other Parameters
| Parameter | Description | Default Value |
|---|---|---|
<analytics-lucene-analyzer> | The implementation of the Analytics Lucene Analyzer is defined as a subelement of this parameter. e.g., <implementation>org.apache.lucene.analysis.standard.StandardAnalyzer</implementation> | |
<indexingThreadCount> | The maximum number of threads used for indexing per node. When | -1 |
<shardCount> | The number of index shards the server should maintain per cluster. This fine tunes the scaling nature of the indexing cluster. This parameter can only be set once for the lifetime of the cluster, and cannot be changed later on. | 6 |
<shardIndexRecordBatchSize> | The number of batch index records the indexing node should process per each indexing thread at a given time. An index record contains data of a record batch inserted in a single put operation. This batch can be as high as the event receiver queue data size, which is 10MB by default. Therefore, the highest amount of in-memory record data that an indexing processing thread can have is 10MB * 100. This parameter should be configured to change the maximum amount of memory available to the indexing node based on your requirement. | 100 |