CDMI QoS plugin for EOS Storage Backend

Description

This is a plugin for the INDIGO-DataCloud CDMI Server. The plugin exposes the QoS interface of the EOS storage endpoint to the CDMI-Server and allows QoS interactions on EOS entries using the CDMI protocol.

The plugin facilitates two main interactions:

• discovery of QoS capabilities
• manipulation of QoS properties of a given entry

Build and install

Requirements

• JDK 1.8+
• Maven 3.1+

Dependencies

• INDIGO-DataCloud CDMI SPI

Compilation

Make sure to enable the following Maven repository: http://cdmi-qos.data.kit.edu/maven/

To compile the cdmi-eos-qos plugin, execute the following:

$ git clone https://github.com/cern-eos/cdmi-eos-qos.git
$ cd cdmi-eos-qos
$ mvn install

The final product will be the cdmi-eos-qos-<version>.jar artifact.

Installation

The plugin must be used as a component for the INDIGO-DataCloud CDMI Server. To enable this, add cdmi-eos-qos as a dependency to the server's pom.xml file and repackage the server

<dependency>
    <groupId>org.dcache.spi</groupId>
    <artifactId>cdmi-eos-qos</artifactId>
    <version>1.0</version>
</dependency>

Configuration

The plugin will try to load the following properties:

• eos.server
• eos.server.port
• eos.server.scheme

Make sure you provide these values either via a config/eos.config file accessible by the CDMI server or via command line.

Interaction

• Query available CDMI capabilities for a given entry type

davix-http -X GET -H 'Authorization: "Bearer: $OIDC"' -H 'Accept: "application/cdmi-capability"' \
    https://cdmi-server.cern.ch:8443/cdmi_capabilities/dataobject/

• Query description of a given CDMI capability

davix-http -X GET -H 'Authorization: "Bearer: $OIDC"' -H 'Accept: "application/cdmi-capability"' \
    https://cdmi-server.cern.ch:8443/cdmi_capabilities/dataobject/disk_replica

• Get CDMI capability of an entry

davix-http -X GET -H 'Authorization: "Bearer: $OIDC"' -H 'Accept: "application/cdmi-object"' \
    https://cdmi-server.cern.ch:8443/<file-path>

• Set CDMI capability of an entry

davix-http -X PUT -H 'Authorization: "Bearer: $OIDC"' -H 'Content-Type: "application/cdmi-object"' \
    --data '{"capabilitiesURI": "/cdmi_capabilities/dataobject/<capability-type>"}' \
    https://cdmi-server.cern.ch:8443/<file-path>