azure-kusto-java/samples

Getting Started with Kusto Java SDK

Prerequisites

• A Java Developer Kit (JDK), version 11 or later
• Maven
• Clone the project and enter the samples directory:

      git clone https://github.com/Azure/azure-kusto-java.git
      cd samples

Execute Query Sample

This sample will demonstrate how to execute a query.
Sample Code

Prerequisites

• Create Azure Data Explorer Cluster and DB
• Create Azure Active Directory App Registration and grant it permissions to DB (save the app key and the application ID for later)

Steps to follow

1. Build Connection string and initialize the client

ConnectionStringBuilder csb = ConnectionStringBuilder.createWithAadApplicationCredentials(
                    System.getProperty("clusterPath"),
                    System.getProperty("appId"),
                    System.getProperty("appKey"),
                    System.getProperty("appTenant"));
Client client = ClientFactory.createClient(csb);

If you'd like to tweak the underlying HTTP client used to make the requests, build an HTTP client properties object and use that along the Connection string to initialise the client:

ConnectionStringBuilder csb = ConnectionStringBuilder.createWithAadApplicationCredentials(
        System.getProperty("clusterPath"),
        System.getProperty("appId"),
        System.getProperty("appKey"),
        System.getProperty("appTenant"));

HttpClientProperties properties = HttpClientProperties.builder()
        .keepAlive(true)
        .maxKeepAliveTime(120)
        .maxConnectionsPerRoute(40)
        .maxConnectionsTotal(40)
        .build();

Client client = ClientFactory.createClient(csb, properties);

2. Execute query

KustoOperationResult results = client.execute( System.getProperty("dbName"), System.getProperty("query"));

How to run this sample

cd samples
mvn clean compile exec:java -Dexec.mainClass="Query" \
                            -DclusterPath="cluster/path" \
                            -DappId="app-id" \
                            -DappKey="appKey" \
                            -DappTenant="subscription-id" \
                            -DdbName="dbName" \
                            -Dquery="your | query"

Advanced Query Sample

This sample shows some more advanced options available when querying data, like using query parameters to guard against injection attacks and extracting individual values from the query results.
Sample Code for Advanced Query

Prerequisites

• Create Azure Data Explorer Cluster and DB
• Create Azure Active Directory App Registration and grant it permissions to DB (save the app key and the application ID for later). Principal's permission must be at least 'Database user'.

Notable Features

1. Creating a table with initial data using the .set-or-replace command

String tableCommand = String.join(newLine,
        ".set-or-replace Events <|",
        "range x from 1 to 100 step 1",
        "| extend ts = totimespan(strcat(x,'.00:00:00'))",
        "| project timestamp = now(ts), eventName = strcat('event ', x)");
client.execute(database, tableCommand);

2. Using query parameters to guard against injection attacks

ClientRequestProperties clientRequestProperties = new ClientRequestProperties();
clientRequestProperties.setParameter("eventNameFilter", "event 1");
String query = String.join(newLine,
        "declare query_parameters(eventNameFilter:string);",
        "Events",
        "| where eventName == eventNameFilter");
KustoOperationResult results = client.execute(database, query, clientRequestProperties);

3. Extracting individual values from the query results

KustoResultSetTable mainTableResult = results.getPrimaryResults();
System.out.printf("Kusto sent back %s rows.%n", mainTableResult.count());

// iterate values
List<Event> events = new ArrayList<>();
while (mainTableResult.next()) {
    events.add(new Event(
        mainTableResult.getKustoDateTime("timestamp"), 
        mainTableResult.getString("eventName")));
}

How to run this sample

Note: Running this sample will create a table named Events in the given database.

cd samples
mvn clean compile exec:java -Dexec.mainClass="AdvancedQuery" \
                            -DclusterPath="cluster/path" \
                            -DappId="app-id" \
                            -DappKey="appKey" \
                            -DappTenant="tenant-id" \
                            -DdbName="dbName" 

File Ingestion Sample

This sample will demonstrate how to ingest data from a file into table.
Sample Code

Prerequisites

• Create Azure Data Explorer Cluster and DB
• Create Azure Active Directory App Registration and grant it permissions to DB (save the app key and the application ID for later)
• Create a table in the DB
• Create a mapping between the file and the table

Steps to follow

1. Build connection string and initialize

ConnectionStringBuilder csb =
                    ConnectionStringBuilder.createWithAadApplicationCredentials(System.getProperty("clusterPath"),
                            System.getProperty("appId"),
                            System.getProperty("appKey"),
                            System.getProperty("appTenant"));

2. Initialize client and its properties

IngestClient client = IngestClientFactory.createClient(csb);

IngestionProperties ingestionProperties = new IngestionProperties(System.getProperty("dbName"),
                    System.getProperty("tableName"));
ingestionProperties.getIngestionMapping().setIngestionMappingReference(System.getProperty("dataMappingName"), IngestionMapping.IngestionMappingKind.Csv);

3. Load file and ingest it into table

FileSourceInfo fileSourceInfo = new FileSourceInfo(System.getProperty("filePath"), 0);
IngestionResult ingestionResult = client.ingestFromFile(fileSourceInfo, ingestionProperties);

How to run this sample

cd samples
mvn clean compile exec:java -Dexec.cleanupDaemonThreads=false \
                              -Dexec.mainClass="FileIngestion" \
                              -DclusterPath="cluster/path" \
                              -DappId="app-id" \
                              -DappKey="appKey" \
                              -DappTenant="subscription-id" \
                              -DdbName="dbName" \
                              -DtableName="tableName" \
                              -DdataMappingName="dataMappingName" \
                              -DfilePath="file/path"

StreamingIngest Sample

This sample will demonstrate how to ingest data using the streaming ingest client. {Sample Code](src/main/java/StreamingIngest)

Prerequisites

• Create Azure Data Explorer Cluster and DB
• Create Azure Active Directory App Registration and grant it permissions to DB (save the app key and the application ID for later)
• Create a table in the DB:

.create table StreamingIngest (rownumber:int, rowguid:string, xdouble:real, xfloat:real, xbool:bool, xint16:int, xint32:int, xint64:long, xuint8:long, xuint16:long, xuint32:long, xuint64:long, xdate:datetime, xsmalltext:string, xtext:string, xnumberAsText:string, xtime:timespan, xtextWithNulls:string, xdynamicWithNulls:dynamic)

• Create a mapping between the file and the table :

.create table StreamingIngest ingestion json mapping "JsonMapping" '[{"column":"rownumber","path": "$.rownumber", "datatype":"int" },{"column":"rowguid", "path":"$.rowguid","datatype":"string" },{"column":"xdouble", "path":"$.xdouble", "datatype":"real" },{"column":"xfloat", "path":"$.xfloat", "datatype":"real" },{"column":"xbool", "path":"$.xbool", "datatype":"bool" },{"column":"xint16", "path":"$.xint16", "datatype":"int" },{"column":"xint32", "path":"$.xint32", "datatype":"int" },{"column":"xint64", "path":"$.xint64", "datatype":"long" },{"column":"xuint8", "path":"$.xuint8", "datatype":"long"},{"column":"xuint16", "path":"$.xuint16", "datatype":"long"},{"column":"xuint32", "path":"$.xuint32", "datatype":"long"},{"column":"xuint64", "path":"$.xuint64", "datatype":"long"},{"column":"xdate", "path":"$.xdate", "datatype":"datetime"},{"column":"xsmalltext", "path":"$.xsmalltext","datatype":"string"},{"column":"xtext", "path":"$.xtext","datatype":"string"},{"column":"xnumberAsText", "path":"$.xnumberAsText","datatype":"string"},{"column":"xtime", "path":"$.xtime","datatype":"timespan"}, {"column":"xtextWithNulls", "path":"$.xtextWithNulls","datatype":"string"}, {"column":"xdynamicWithNulls", "path":"$.xdynamicWithNulls","datatype":"dynamic"}]'

Steps to follow

1. Build connection string and initialize

ConnectionStringBuilder csb =
                    ConnectionStringBuilder.createWithAadApplicationCredentials(System.getProperty("clusterPath"),
                            System.getProperty("appId"),
                            System.getProperty("appKey"),
                            System.getProperty("appTenant"));

2. Initialize client and its properties

IngestClient client = IngestClientFactory.createClient(csb);

IngestionProperties ingestionProperties = new IngestionProperties(System.getProperty("dbName"),
                    System.getProperty("tableName"));

3. Create Source info

StreamSourceInfo:

InputStream inputStream = new ByteArrayInputStream(Charset.forName("UTF-8").encode(data).array());
StreamSourceInfo streamSourceInfo = new StreamSourceInfo(inputStream);

If the data is compressed:

streamSourceInfo.setCompressionType(CompressionType.gz);

FileSourceInfo:

FileSourceInfo fileSourceInfo = new FileSourceInfo(path, new File(path).length());

4. Ingest into table and verify ingestion status

From stream:

OperationStatus status = streamingIngestClient.ingestFromStream(streamSourceInfo, ingestionProperties).getIngestionStatusCollection().get(0).status;

From File:

OperationStatus status = streamingIngestClient.ingestFromFile(fileSourceInfo, ingestionProperties).getIngestionStatusCollection().get(0).status;

How to run this sample

cd samples
mvn clean compile exec:java -Dexec.cleanupDaemonThreads=false \
                              -Dexec.mainClass="StreamingIngest" \
                              -DclusterPath="cluster/path" \
                              -DappId="app-id" \
                              -DappKey="appKey" \
                              -DappTenant="subscription-id" \
                              -DdbName="dbName" \
                              -DtableName="tableName" \
                              -DdataMappingName="dataMappingName"

Using CompletableFutures

Take a look at this Sample Code to learn how to run File Ingestion using CompletableFutures in order to make the calls asynchronously.

Note: The implementation itself of the File Ingestion API, like all the other APIs in this version, is not asynchronous.

Query Table Status Sample

This sample will demonstrate how to retrieve ingestion status.
Sample Code

Prerequisites

• Create Azure Data Explorer Cluster and DB
• Create Azure Active Directory App Registration and grant it permissions to DB (save the app key and the application ID for later)
• Create a table in the DB
• Create a mapping between the file and the table

Steps to follow

1. Set timeout for status retrieval :

Integer timeoutInSec = Integer.getInteger("timeoutInSec");

2. Build connection string and initialize

ConnectionStringBuilder csb =
        ConnectionStringBuilder.createWithAadApplicationCredentials( System.getProperty("clusterPath"),
                System.getProperty("appId"),
                System.getProperty("appKey"),
                System.getProperty("appTenant"));

3. Initialize client and its properties

IngestClient client = IngestClientFactory.createClient(csb);

IngestionProperties ingestionProperties = new IngestionProperties( System.getProperty("dbName"),
                    System.getProperty("tableName"));
            ingestionProperties.getIngestionMapping().setIngestionMappingReference(System.getProperty("dataMappingName"), IngestionMapping.IngestionMappingKind.Csv);
            ingestionProperties.setReportMethod(QueueAndTable);
            ingestionProperties.setReportLevel(IngestionProperties.IngestionReportLevel.FAILURES_AND_SUCCESSES);

4. Load file and ingest it into table

FileSourceInfo fileSourceInfo = new FileSourceInfo(System.getProperty("filePath"), 0);
IngestionResult ingestionResult = client.ingestFromFile(fileSourceInfo, ingestionProperties);

5. Retrieve ingestion status and wait for result

List<IngestionStatus> statuses = ingestionResult.getIngestionStatusCollection();

while (statuses.get(0).status == OperationStatus.Pending && timeoutInSec > 0) {
    Thread.sleep(1000);
    timeoutInSec -= 1;
    statuses = ingestionResult.getIngestionStatusCollection();
}

Running this sample

To run this sample:

cd samples
mvn clean compile exec:java -Dexec.mainClass="TableStatus" \
                            -DclusterPath="cluster/path" \
                            -DappId="app-id" \
                            -DappKey="appKey" \
                            -DappTenant="subscription-id" \
                            -DdbName="dbName" \
                            -DtableName="tableName" \
                            -DdataMappingName="dataMappingName" \
                            -DfilePath="file/path"
                            -DtimeoutInSec=300

More information

http://azure.com/java

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