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MapReduce
General MapReduce configuration Add Accumulo’s MapReduce API to your dependencies Configure dependencies for your MapReduce job Read input from an Accumulo table Write output t... -
Configuration Files
accumulo.properties accumulo-client.properties accumulo-env.sh Log configuration files log4j2-service.properties log4j2.properties cluster.yaml gc manager monitor tserver ... -
Erasure Coding
Important Warning EC and Threads HDFS ec Command Configuring EC for a New Instance Configuring EC for an Existing Instance Defining Custom EC Policies With the release of ve... -
Development Tools
MiniAccumuloCluster Iterator Test Harness Framework Use Normal Test Outline Limitations Accumulo has several tools that can help developers test their code. MiniAccumuloClu... -
Glossary
authorizations a set of strings associated with a user or with a particular scan that will be used to determine which key/value pairs are visible to the user. cell a set ... -
Multi-Volume Installations
This is an advanced configuration setting for very large clusters under a lot of write pressure. The HDFS NameNode holds all of the metadata about the files in HDFS. For fast per... -
Authentication
Configuration Root user Creating users Authenticating users Changing user passwords Removing users Accumulo has authentication to verify the identity of users. Configurati... -
Caching
Configuration Accumulo tablet servers have block caches that buffer data in memory to limit reads from disk. This caching has the following benefits: reduces latency when rea... -
Permissions
Configuration Granting permission View permissions Revoking permissions Accumulo users can only perform actions if they are given permission. Accumulo has three types of perm... -
Performance
Read performance Write performance Accumulo can be tuned to improve read and write performance. Read performance Enable caching on tables to reduce reads to disk. Enable b...