Apache Ambari User Guide
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HBase - Tables

These metrics reflect data on the table level. The HBase - Tables dashboards and data help you compare load distribution and resource usage among tables in a cluster at different points of time.

RowMetrics

Description

NUM REGIONS/STORES

Num Regions

Number of regions for the table(s).

Num Stores

Number of stores for the table(s).

TABLE SIZE

Table Size

Total size of the data (store files and MemStore) for the table(s).

Average Region Size

Average size of the region for the table(s). Average Region Size is calculated from average of average region sizes reported by each RegionServer (may not be the true average).

MEMSTORE SIZE

MemStore Size

Total MemStore size of the table(s).

STORE FILES

Store File Size

Total size of the store files (data files) for the table(s).

Num Store Files

Total number of store files for the table(s).

STORE FILE AGE

Max Store File Age

Maximum age of store files for the table(s). As compactions rewrite data, store files are also rewritten. Max Store File Age is calculated from the maximum of all maximum store file ages reported by each RegionServer.

Min Store File Age

Minimum age of store files for the table(s). As compactions rewrite data, store files are also rewritten. Min Store File Age is calculated from the minimum of all minimum store file ages reported by each RegionServer.

Average Store File Age

Average age of store files for the table(s). As compactions rewrite data, store files are also rewritten. Average Store File Age is calculated from the average of average store file ages reported by each RegionServer.

Num Reference Files - Total on All

Total number of reference files for the table(s).

NUM TOTAL REQUESTS

Num Total Requests /s on Tables

Total number of requests (both read and write) per second for the table(s).

NUM READ REQUESTS

Num Read Requests /s

Total number of read requests per second for the table(s).

NUM WRITE REQUESTS

Num Write Requests /s

Total number of write requests per second for the table(s).

NUM FLUSHES

Num Flushes /s

Total number of flushes per second for the table(s).

FLUSHED BYTES

Flushed MemStore Bytes

Total number of flushed MemStore bytes for the table(s).

Flushed Output Bytes

Total number of flushed output bytes for the table(s).

FLUSH TIME HISTOGRAM

Flush Time Mean

Mean latency for Flush operation for the table(s).

Flush Time Median

Median latency for Flush operation for the table(s).

Flush Time 95th Percentile

95th percentile latency for Flush operation for the table(s).

Flush Time Max

Maximum latency for Flush operation for the table(s).

FLUSH MEMSTORE SIZE HISTOGRAM

Flush MemStore Size Mean

Mean size of the MemStore for Flush operation for the table(s).

Flush MemStore Size Median

Median size of the MemStore for Flush operation for the table(s).

Flush Output Size 95th Percentile

95th percentile size of the MemStore for Flush operation for the table(s).

Flush MemStore Size Max

Max size of the MemStore for Flush operation for the table(s).

FLUSH OUTPUT SIZE HISTOGRAM

Flush Output Size Mean

Mean size of the output file for Flush operation for the table(s).

Flush Output Size Median

Median size of the output file for Flush operation for the table(s).

Flush Output Size 95th Percentile

95th percentile size of the output file for Flush operation for the table(s).

Flush Output Size Max

Max size of the output file for Flush operation for the table(s).