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Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
Toolkits
A toolkit is a set of SPL artifacts, which are organized into a package. Toolkits make SPL or native functions and primitive or composite operators reusable across different applications.
Toolkits
Toolkit com.teracloud.streams.crossdcfailover 2.0.0
Namespace com.teracloud.streams.crossdc.failover
SPL File CrossDataCenterFailover.spl

Welcome
Learn about the core capabilities of Teracloud® Streams, its architecture, and key concepts.
Installing
Use this information to install, upgrade, and uninstall the Teracloud® Streams product.
Configuring
Create a basic or an enterprise domain which is a single point for configuring and managing common resources, security, and instances.
Administering
Administer the product by using the Teracloud® Streams graphical user interface, APIs, or the streamtool command-line interface.
Developing
Develop stream applications with the Streams Processing Language (SPL), Java, and Python.
Troubleshooting
Resolve problems with Teracloud® Streams using the troubleshooting tools provided with the product as well as the resources offered by Teracloud Support.
Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
- APIs
  Application programming interfaces (APIs) provide functions that simplify applications development.
- Job configuration overlays
  You can specify or change configuration parameters when you use the submitjob or updateoperators operations. The settings control submission constraints, host constraints and locations, and operator status. Parameters are captured and updated in the configuration JSON file. When you change the values in the job configuration overlay file, the changes override any previously set values.
- Commands
  Teracloud® Streams provides a number of commands you use to perform tasks.
- Operator model
  An operator model is an XML document that describes the basic properties of a primitive operator.
- Streams Processing Language (SPL)
  Streams Processing Language (SPL) is a distributed data flow composition language that is used in Teracloud® Streams. SPL has primitive types, program structures, and definitions that are tailored for streaming data.
- Toolkits
  A toolkit is a set of SPL artifacts, which are organized into a package. Toolkits make SPL or native functions and primitive or composite operators reusable across different applications.
  - Specialized toolkit requirements and restrictions
    Several of the specialized toolkits require RPMs that are not required by the Teracloud® Streams product. There are also toolkit restrictions on some platforms.
  - Toolkits
- SPLDOC markup
  You can use SPLDOC markup in the descriptions associated with the SPL artifacts in a toolkit. The spl-make-doc command generates HTML documentation from the marked up artifacts.
Glossary
Use this glossary to find terms and definitions for Teracloud® Streams.

SPL File CrossDataCenterFailover.spl

Example: The following is a code block that demonstrates how to invoke the CrossDataCenterFailover composite operator within an Streams application:

Content

Operators

CrossDataCenterFailover

Composites

composite CrossDataCenterFailover(output DataSnapshotSignal, RemoteDataCenterStatus, ProcessDataFromRemoteDC; input SerializedDataSnapshotMessage, SpecialMessage)

Parameters

localDataCenterName
crossDCOperationMode
crossDCHttpPort
remoteDataCenterApplicationMachineNames
crossDCInitDelay
heartbeatExchangeInterval
consecutiveHeartbeatMissesAllowed
dataSnapshotExchangeInterval
dataSnapshotStorageDirectory
dataSnapshotJdbcUrl
dataSnapshotJdbcUser
dataSnapshotJdbcPassword
dataSnapshotJdbcDriverLib
dataSnapshotJdbcClassName
dataSnapshotTableName
dataSnapshotPrimaryKeyColumnName
sendToAllRemoteMachines
alwaysLogHttpErrors
httpConnectionTimeout
httpReadTimeout
numberOfHttpSenderReceiverPairs
remoteDataCenterUrlPathForHeartbeatReceiver
remoteDataCenterUrlPath
retainOlderDataSnapshotsAtStartup
sendDataSnapshotsToOriginDCAtStartup
configFileName
localDataCenterNameKey
crossDCOperationModeKey
crossDCHttpPortKey
remoteDataCenterApplicationMachineNamesKey
dataSnapshotStorageDirectoryKey
dataSnapshotJdbcUrlKey
dataSnapshotJdbcUserKey
dataSnapshotJdbcPasswordKey
dataSnapshotJdbcDriverLibKey
dataSnapshotJdbcClassNameKey
dataSnapshotTableNameKey
dataSnapshotPrimaryKeyColumnNameKey
crossDCInitDelayKey
heartbeatExchangeIntervalKey
consecutiveHeartbeatMissesAllowedKey
dataSnapshotExchangeIntervalKey
sendToAllRemoteMachinesKey
alwaysLogHttpErrorsKey
httpConnectionTimeoutKey
httpReadTimeoutKey
retainOlderDataSnapshotsAtStartupKey
sendDataSnapshotsToOriginDCAtStartupKey

Input Ports

SerializedDataSnapshotMessage
SpecialMessage

Output Ports

DataSnapshotSignal
RemoteDataCenterStatus
ProcessDataFromRemoteDC