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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 ... -
Sampling
Overview Configuring Scanning sample data Bulk import Overview Accumulo has the ability to generate and scan a per table set of sample data. This sample data is kept up to da... -
Proxy
Prerequisites Running the Proxy Server Proxy Client Examples Ruby Python Java The Accumulo Proxy allows the interaction with Accumulo with languages other than Java. A prox... -
Tracing
Configuring Tracing Instrumenting a Client Tracing from the Shell It can be difficult to determine why some operations are taking longer than expected. For example, you may be ... -
Configuration Files
accumulo.properties accumulo-client.properties accumulo-env.sh Log configuration files log4j2-service.properties log4j2.properties cluster.yaml gc manager monitor tserver ... -
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... -
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... -
System Metadata Tables
Accumulo tracks information about tables in metadata tables. The metadata for most tables is contained within the metadata table in the accumulo namespace, while metadata for that... -
ZooKeeper
ZooKeeper ACLs ACL errors during upgrade ZooKeeper ACLs Accumulo requires full access to nodes in ZooKeeper under the /accumulo path. The ACLs can be examined using the ZooKee... -
Security Overview
Security Overview Implementation Security Overview Accumulo has the following security features: Only authenticated users can access Accumulo. Kerberos can be enabled to re...
