GeoDocker Accumulo

Apache Accumulo container for GeoDocker Cluster

Roles

This container has three roles that can be supplied as CMD:

• master - master instance, handles synchronization
  • --auto-init - initialize an accumulo instance if one is not found at hdfs://${HADOOP_MASTER_ADDRESS}/accumulo
• tserver - tablet server, serves data
• monitor - monitor instance, provides Web GUI at 50095
• gc - garbage collector for accumulo tablets
• tracer - trace for debugging

Configuration

Accumulo container requires HDFS as well as Accumulo configuration. This configuration will be generated from a template if you provide the required environment variables.

Additionally you have an option of volume mounting the configuration files to /etc/hadoop/conf to configure HDFS and /opt/accumulo/conf to configure Accumulo.

Environment

• HADOOP_MASTER_ADDRESS - hostname for accumulo root, required for all roles
• ZOOKEEPERS - list of zookeeper instance, at least one
• ACCUMULO_SECRET - secret value for inter-instance communication (default: DEFAULT)
• INSTANCE_NAME - accumulo instance name (default: accumulo)
• ACCUMULO_PASSWORD - root password
• INSTANCE_VOLUME - HDFS path to accumulo instance volume, generated if not provided
• TSERVER_XMX - JVM -Xmx parameter value for Accumulo tserver (default: 3g)
• MASTER_XMX - JVM -Xmx parameter value for Accumulo master (default: 2g)
• MONITOR_XMX - JVM -Xmx parameter value for Accumulo monitor (default: 1g)
• GC_XMX - JVM -Xmx parameter value for Accumulo garbage collector (default: 1g)
• TSERVER_CACHE_DATA_SIZE - tserver.cache.data.size in accumulo-site.xml
• TSERVER_CACHE_INDEX_SIZE - tserver.cache.index.size in accumulo-site.xml
• TSERVER_MEMORY_MAPS_MAX - tserver.memory.maps.max in accumulo-site.xml

HADOOP_MASTER_ADDRESS need not be provided if core-site.xml is volume mounted in /etc/hadoop/conf or INSTANCE_VOLUME is provided.

Testing

This container should be tested with docker-compose and through make test