MapR Cache Metrics

Every 10 seconds, the collectd service uses a MapR plugin to gather the following MapR file system cache metrics on each node in the cluster.

Name Description
mapr.cache.lookups_data The number of cache lookups in the block cache.
mapr.cache.lookups_dir The number of cache lookups in the table LRU cache. The table LRU is used for storing internal B-Tree leaf pages.
mapr.cache.lookups_inode The number of cache lookups in the inode cache.
mapr.cache.lookups_largefile The number of cache lookups in the large file LRU cache. The large file LRU is used for storing files with size greater than 64K and also MapR Database data pages.
mapr.cache.lookups_meta The number of cache lookups on the meta LRU cache. The meta LRU is used for storing internal B-Tree pages.
mapr.cache.lookups_smallfile The number of cache lookups on the small file LRU cache. This LRU is used for storing files with size less than 64K and also MapR Database index pages.
mapr.cache.lookups_table The number of cache lookups in the table LRU cache. The table LRU is used for storing internal B-Tree leaf pages.
mapr.cache.misses_data The number of cache misses in the block cache.
mapr.cache.misses_dir The number of cache misses on the table LRU cache.
mapr.cache.misses_inode The number of cache misses in the inode cache.
mapr.cache.misses_largefile The number of cache misses on the large file LRU cache.
mapr.cache.misses_meta The number of cache misses on the meta LRU cache.
mapr.cache.misses_smallfile The number of cache misses on the small file LRU cache.
mapr.cache.misses_table The number of cache misses on the table LRU cache.