Crossdata is a distributed framework and a data layer that unifies the interaction with batch and streaming sources supporting multiple datastore technologies thanks to its generic architecture and a custom SQL-like language with support for streaming queries. Supporting multiple architectures imposes two main challenges: how to normalize the access to the datastores, and how to cope with datastore limitations. To access multiple technologies Crossdata defines a common unifying interface containing the set of operations that a datastore may support. New connectors can be easily added to increase its connectivity capabilities. Two types of connectors are defined: native and spark-based. Native connectors are faster for simple operations, while Spark-based connectors offer a larger set of functionality. The Crossdata planner decides which connector will be used for any request based its characteristics. We offer a shell, Java/REST APIs, JDBC and ODBC for BI.

Compiling Crossdata involves generating a set of files (.tokens, Lexers and Parsers) from the different grammar files. To automatically build Stratio Crossdata execute the following command:

> mvn clean install

If you prefer to skip the unitary and integration tests, just type:

> mvn clean install -DskipUTs -DskipITs

> mvn exec:java -pl crossdata-server -Dexec.mainClass="com.stratio.crossdata.server.CrossdataApplication"

or you can run our script located in crossdata-dist:

> chmod +x crossdata-dist/target/crossdata-dist-[crossdata-version]/bin/crossdata-server
> cd crossdata-dist/target/crossdata-dist-[crossdata-version]/
> bin/crossdata-server

or run it like a service:

> bin/crossdata-server-daemon start

Running the crossdata-shell ==========================

The com.stratio.crossdata-shell allows users to launch interactive queries against a set of Crossdata servers. Works both in Unix and Windows. The shell features:

• History support (arrow navigation)
• History search (ctrl-r)
• Token completion (tab)

- Help command :

> mvn exec:java -pl crossdata-shell -Dexec.mainClass="com.stratio.crossdata.sh.Shell"

The default behaviour of the Shell is asynchronous, however, the shell also supports synchronous query execution by means of the --sync parameter.:

> mvn exec:java -pl crossdata-shell -Dexec.mainClass="com.stratio.crossdata.sh.Shell" -Dexec.args="--sync"

Additionally, you can execute an script upon launching the shell. The script will be executed first, and the prompt will be shown afterwards.:

> mvn exec:java -pl crossdata-shell -Dexec.mainClass="com.stratio.crossdata.sh.Shell" -Dexec.args="--script /path/script.xdql"

You can run our shell too, executing our crossdata-dist script:

> chmod +x crossdata-dist/target/crossdata-dist-[crossdata-version]/bin/crossdata-sh
> cd crossdata-dist/target/crossdata-dist-[crossdata-version]/
> bin/crossdata-sh

Once the shell is running, you can exit the program introducing the word exit or quit in the query prompt. A command help system is available by introducing the command help. A help entry is available per command, to check specify help topics use help command.

You can send us issues in https://crossdata.atlassian.net/ You can also find help in https://groups.google.com/forum/#!forum/crossdata-users

Grammar specification for this release can be found here.

In this link you can follow an example of Crossdata with a Cassandra Connector as an access to a Cassandra datastore.

In this link you can read how to configure crossdata in a distributed environment.

List of Crossdata Connectors

InMemory Connector development tutorial

Definition of Connector Operations

If you want to test Crossdata you can get our Sandbox follow the instructions of this link

Stratio Crossdata is licensed as Apache2

Licensed to STRATIO (C) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The STRATIO (C) licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.