AMS HBase RegionServers
The AMS HBase RegionServers dashboards display metrics for RegionServers in the monitored HBase cluster, including some performance-related data.
These dashboards help you view basic I/O data and compare load among RegionServers.
| Row | Metrics | Description |
|---|---|---|
| NUM REGIONS | Num Regions | Number of regions in the RegionServer. |
| STORE FILES | Store File Size | Total size of the store files (data files) in the RegionServer. |
| Store File Count | Total number of store files in the RegionServer. | |
| NUM REQUESTS | Num Total Requests /s | Total number of requests (both read and write) per second in the RegionServer. |
| Num Write Requests /s | Total number of write requests per second in the RegionServer. | |
| Num Read Requests /s | Total number of read requests per second in the RegionServer. | |
| NUM REQUESTS - GET / SCAN | Num Get Requests /s | Total number of Get requests per second in the RegionServer. |
| Num Scan Next Requests /s | Total number of Scan requests per second in the RegionServer. | |
| NUM REQUESTS - MUTATE / DELETE | Num Mutate Requests - /s | Total number of Mutate requests per second in the RegionServer. |
| Num Delete Requests /s | Total number of Delete requests per second in the RegionServer. | |
| NUM REQUESTS - APPEND / INCREMENT | Num Append Requests /s | Total number of Append requests per second in the RegionServer. |
| Num Increment Requests /s | Total number of Increment requests per second in the RegionServer. | |
| Num Replay Requests /s | Total number of Replay requests per second in the RegionServer. | |
| MEMORY | RegionServer Memory Used | Heap Memory used by the RegionServer. |
| RegionServer Offheap Memory Used | Offheap Memory used by the RegionServer. | |
| MEMSTORE | Memstore Size | Total Memstore memory size of the RegionServer. |
| BLOCKCACHE - OVERVIEW | BlockCache - Size | Total BlockCache size of the RegionServer. |
| BlockCache - Free Size | Total free space in the BlockCache of the RegionServer. | |
| Num Blocks in Cache | Total number of hfile blocks in the BlockCache of the RegionServer. | |
| BLOCKCACHE - HITS/MISSES | Num BlockCache Hits /s | Number of BlockCache hits per second in the RegionServer. |
| Num BlockCache Misses /s | Number of BlockCache misses per second in the RegionServer. | |
| Num BlockCache Evictions /s | Number of BlockCache evictions per second in the RegionServer. | |
| BlockCache Caching Hit Percent | Percentage of BlockCache hits per second for requests that requested cache blocks in the RegionServer. | |
| BlockCache Hit Percent | Percentage of BlockCache hits per second in the RegionServer. | |
| OPERATION LATENCIES - GET | Get Latencies - Mean | Mean latency for Get operation in the RegionServer. |
| Get Latencies - Median | Median latency for Get operation in the RegionServer. | |
| Get Latencies - 75th Percentile | 75th percentile latency for Get operation in the RegionServer | |
| Get Latencies - 95th Percentile | 95th percentile latency for Get operation in the RegionServer. | |
| Get Latencies - 99th Percentile | 99th percentile latency for Get operation in the RegionServer. | |
| Get Latencies - Max | Max latency for Get operation in the RegionServer. | |
| OPERATION LATENCIES - SCAN NEXT | Scan Next Latencies - Mean | Mean latency for Scan operation in the RegionServer. |
| Scan Next Latencies - Median | Median latency for Scan operation in the RegionServer. | |
| Scan Next Latencies - 75th Percentile | 75th percentile latency for Scan operation in the RegionServer. | |
| Scan Next Latencies - 95th Percentile | 95th percentile latency for Scan operation in the RegionServer. | |
| Scan Next Latencies - 99th Percentile | 99th percentile latency for Scan operation in the RegionServer. | |
| Scan Next Latencies - Max | Max latency for Scan operation in the RegionServer. | |
| OPERATION LATENCIES - MUTATE | Mutate Latencies - Mean | Mean latency for Mutate operation in the RegionServer. |
| Mutate Latencies - Median | Median latency for Mutate operation in the RegionServer. | |
| Mutate Latencies - 75th Percentile | 75th percentile latency for Mutate operation in the RegionServer. | |
| Mutate Latencies - 95th Percentile | 95th percentile latency for Mutate operation in the RegionServer. | |
| Mutate Latencies - 99th Percentile | 99th percentile latency for Mutate operation in the RegionServer. | |
| Mutate Latencies - Max | Max latency for Mutate operation in the RegionServer. | |
| OPERATION LATENCIES - DELETE | Delete Latencies - Mean | Mean latency for Delete operation in the RegionServer. |
| Delete Latencies - Median | Median latency for Delete operation in the RegionServer. | |
| Delete Latencies - 75th Percentile | 75th percentile latency for Delete operation in the RegionServer. | |
| Delete Latencies - 95th Percentile | 95th percentile latency for Delete operation in the RegionServer. | |
| Delete Latencies - 99th Percentile | 99th percentile latency for Delete operation in the RegionServer. | |
| Delete Latencies - Max | Max latency for Delete operation in the RegionServer. | |
| OPERATION LATENCIES - INCREMENT | Increment Latencies - Mean | Mean latency for Increment operation in the RegionServer. |
| Increment Latencies - Median | Median latency for Increment operation in the RegionServer. | |
| Increment Latencies - 75th Percentile | 75th percentile latency for Increment operation in the RegionServer. | |
| Increment Latencies - 95th Percentile | 95th percentile latency for Increment operation in the RegionServer. | |
| Increment Latencies - 99th Percentile | 99th percentile latency for Increment operation in the RegionServer. | |
| Increment Latencies - Max | Max latency for Increment operation in the RegionServer. | |
| OPERATION LATENCIES - APPEND | Append Latencies - Mean | Mean latency for Append operation in the RegionServer. |
| Append Latencies - Median | Median latency for Append operation in the RegionServer. | |
| Append Latencies - 75th Percentile | 75th percentile latency for Append operation in the RegionServer. | |
| Append Latencies - 95th Percentile | 95th percentile latency for Append operation in the RegionServer. | |
| Append Latencies - 99th Percentile | 99th percentile latency for Append operation in the RegionServer. | |
| Append Latencies - Max | Max latency for Append operation in the RegionServer. | |
| OPERATION LATENCIES - REPLAY | Replay Latencies - Mean | Mean latency for Replay operation in the RegionServer. |
| Replay Latencies - Median | Median latency for Replay operation in the RegionServer. | |
| Replay Latencies - 75th Percentile | 75th percentile latency for Replay operation in the RegionServer. | |
| Replay Latencies - 95th Percentile | 95th percentile latency for Replay operation in the RegionServer. | |
| Replay Latencies - 99th Percentile | 99th percentile latency for Replay operation in the RegionServer. | |
| Replay Latencies - Max | Max latency for Replay operation in the RegionServer. | |
| RPC - OVERVIEW | Num RPC /s | Number of RPCs per second in the RegionServer. |
| Num Active Handler Threads | Number of active RPC handler threads (to process requests) in the RegionServer. | |
| Num Connections | Number of connections to the RegionServer. | |
| RPC - QUEUES | Num RPC Calls in General Queue | Number of RPC calls in the general processing queue in the RegionServer. |
| Num RPC Calls in Priority Queue | Number of RPC calls in the high priority (for system tables) processing queue in the RegionServer. | |
| Num RPC Calls in Replication Queue | Number of RPC calls in the replication processing queue in the RegionServer. | |
| RPC - Total Call Queue Size | Total data size of all RPC calls in the RPC queues in the RegionServer. | |
| RPC - CALL QUEUED TIMES | RPC - Call Queued Time - Mean | Mean latency for RPC calls to stay in the RPC queue in the RegionServer. |
| RPC - Call Queued Time - Median | Median latency for RPC calls to stay in the RPC queue in the RegionServer. | |
| RPC - Call Queued Time - 75th Percentile | 75th percentile latency for RPC calls to stay in the RPC queue in the RegionServer. | |
| RPC - Call Queued Time - 95th Percentile | 95th percentile latency for RPC calls to stay in the RPC queue in the RegionServer. | |
| RPC - Call Queued Time - 99th Percentile | 99th percentile latency for RPC calls to stay in the RPC queue in the RegionServer. | |
| RPC - Call Queued Time - Max | Max latency for RPC calls to stay in the RPC queue in the RegionServer. | |
| RPC - CALL PROCESS TIMES | RPC - Call Process Time - Mean | Mean latency for RPC calls to be processed in the RegionServer. |
| RPC - Call Process Time - Median | Median latency for RPC calls to be processed in the RegionServer. | |
| RPC - Call Process Time - 75th Percentile | 75th percentile latency for RPC calls to be processed in the RegionServer. | |
| RPC - Call Process Time - 95th Percentile | 95th percentile latency for RPC calls to be processed in the RegionServer. | |
| RPC - Call Process Time - 99th Percentile | 99th percentile latency for RPC calls to be processed in the RegionServer. | |
| RPC - Call Process Time - Max | Max latency for RPC calls to be processed in the RegionServer. | |
| RPC - THROUGHPUT | RPC - Received bytes /s | Received bytes from the RPC in the RegionServer. |
| RPC - Sent bytes /s | Sent bytes from the RPC in the RegionServer. | |
| WAL - FILES | Num WAL - Files | Number of Write-Ahead-Log files in the RegionServer. |
| Total WAL File Size | Total files sized of Write-Ahead-Logs in the RegionServer. | |
| WAL - THROUGHPUT | WAL - Num Appends /s | Number of append operations per second to the filesystem in the RegionServer. |
| WAL - Num Sync /s | Number of sync operations per second to the filesystem in the RegionServer. | |
| WAL - SYNC LATENCIES | WAL - Sync Latencies - Mean | Mean latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. |
| WAL - Sync Latencies - Median | Median latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. | |
| WAL - Sync Latencies - 75th Percentile | 75th percentile latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. | |
| WAL - Sync Latencies - 95th Percentile | 95th percentile latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. | |
| WAL - Sync Latencies - 99th Percentile | 99th percentile latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. | |
| WAL - Sync Latencies - Max | Max latency for Write-Ahead-Log sync operation to the filesystem in the RegionServer. | |
| WAL - APPEND LATENCIES | WAL - Append Latencies - Mean | Mean latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. |
| WAL - Append Latencies - Median | Median latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Latencies - 75th Percentile | 95th percentile latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Latencies - 95th Percentile | 95th percentile latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Latencies - 99th Percentile | 99th percentile latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Latencies - Max | Max latency for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - APPEND SIZES | WAL - Append Sizes - Mean | Mean data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. |
| WAL - Append Sizes - Median | Median data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Sizes - 75th Percentile | 75th percentile data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Sizes - 95th Percentile | 95th percentile data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Sizes - 99th Percentile | 99th percentile data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| WAL - Append Sizes - Max | Max data size for Write-Ahead-Log append operation to the filesystem in the RegionServer. | |
| SLOW OPERATIONS | WAL Num Slow Append /s | Number of append operations per second to the filesystem that took more than 1 second in the RegionServer. |
| Num Slow Gets /s | Number of Get requests per second that took more than 1 second in the RegionServer. | |
| Num Slow Puts /s | Number of Put requests per second that took more than 1 second in the RegionServer. | |
| Num Slow Deletes /s | Number of Delete requests per second that took more than 1 second in the RegionServer. | |
| FLUSH/COMPACTION QUEUES | Flush Queue Length | Number of Flush operations waiting to be processed in the RegionServer. A higher number indicates flush operations being slow. |
| Compaction Queue Length | Number of Compaction operations waiting to be processed in the RegionServer. A higher number indicates compaction operations being slow. | |
| Split Queue Length | Number of Region Split operations waiting to be processed in the RegionServer. A higher number indicates split operations being slow. | |
| JVM - GC COUNTS | GC Count /s | Number of Java Garbage Collections per second. |
| GC Count ParNew /s | Number of Java ParNew (YoungGen) Garbage Collections per second. | |
| GC Count CMS /s | Number of Java CMS Garbage Collections per second. | |
| JVM - GC TIMES | GC Times /s | Total time spend in Java Garbage Collections per second. |
| GC Times ParNew /s | Total time spend in Java ParNew(YoungGen) Garbage Collections per second. | |
| GC Times CMS /s | Total time spend in Java CMS Garbage Collections per second. | |
| LOCALITY | Percent Files Local | Percentage of files served from the local DataNode for the RegionServer. |