9.2. RegionServer Metrics

9.2.1. hbase.regionserver.blockCacheCount

Block cache item count in memory. This is the number of blocks of storefiles (HFiles) in the cache.

9.2.2. hbase.regionserver.blockCacheFree

Block cache memory available (bytes).

9.2.3. hbase.regionserver.blockCacheHitRatio

Block cache hit ratio (0 to 100). TODO: describe impact to ratio where read requests that have cacheBlocks=false

9.2.4. hbase.regionserver.blockCacheSize

Block cache size in memory (bytes)

9.2.5. hbase.regionserver.compactionQueueSize

Size of the compaction queue. This is the number of stores in the region that have been targeted for compaction.

9.2.6. hbase.regionserver.fsReadLatency_avg_time

Filesystem read latency (ms). This is the average time to read from HDFS.

9.2.7. hbase.regionserver.fsReadLatency_num_ops

TODO

9.2.8. hbase.regionserver.fsSyncLatency_avg_time

Filesystem sync latency (ms)

9.2.9. hbase.regionserver.fsSyncLatency_num_ops

TODO

9.2.10. hbase.regionserver.fsWriteLatency_avg_time

Filesystem write latency (ms)

9.2.11. hbase.regionserver.fsWriteLatency_num_ops

TODO

9.2.12. hbase.regionserver.memstoreSizeMB

Sum of all the memstore sizes in this RegionServer (MB)

9.2.13. hbase.regionserver.regions

Number of regions served by the RegionServer

9.2.14. hbase.regionserver.requests

Total number of read and write requests. Requests correspond to RegionServer RPC calls, thus a single Get will result in 1 request, but a Scan with caching set to 1000 will result in 1 request for each 'next' call (i.e., not each row). A bulk-load request will constitute 1 request per HFile.

9.2.15. hbase.regionserver.storeFileIndexSizeMB

Sum of all the storefile index sizes in this RegionServer (MB)

9.2.16. hbase.regionserver.stores

Number of stores open on the RegionServer. A store corresponds to a column family. For example, if a table (which contains the column family) has 3 regions on a RegionServer, there will be 3 stores open for that column family.

9.2.17. hbase.regionserver.storeFiles

Number of store filles open on the RegionServer. A store may have more than one storefile (HFile).