HBase Dashboard
HBase integration in Pulse is a distributed column-oriented database that stores huge amounts of data that can be accessed in a random manner. It also provides random real-time read/write access to data in the Hadoop File System. Pulse provides you with an overview of each component of your HBase database. The following components can be viewed:
- HBase Cluster details
- HBase Regions
- HBase Tables
- HBase Region Servers
The HBase Dashboard provides you with the basic statistics about an HBase cluster.
The default time range is Last 24 hrs. To view metrics for a custom date range, click the Timeframe icon in the top-right corner of the page and select the required time frame and timezone.
Cluster
The following table describes the Cluster tile.
| Metrics | Description |
|---|---|
| Num Region Servers | The total number of region servers in the cluster |
| Region Servers Dead | The total number of region servers that are dead in the cluster |
| Master Status | The state of the HBase Master in the cluster, whether it is running or stopped |
| Cluster Requests | The total number of requests in the cluster |
| Size | The size of the cluster, in GB |
| Req Rate/Sec | The total number of requests per second |
| Read Count | The total number of reads completed in the cluster |
| Write Count | The total number of writes completed in the cluster |
Region
The following table describes the Region tile.
| Metric | Description |
|---|---|
| Num Regions | The number of regions in the cluster |
| Regions Over Threshold | The number of regions in transition state for longer than 1 minute in the cluster |
| Regions in Transition | The number of regions in transition in the cluster |
| WAL File Count | The number of Write-Ahead-Log files in the cluster |
| WAL File Size | The total files size of Write-Ahead-Log in the cluster |
| Store File Count | The total number of store files in the cluster |
| Store File Size | The total size of store files in the cluster |
| Files Local % | Percentage of files served from the local Data Node for the region server in the cluster |
Region Compaction
The following table describes the Region Compaction tile.
| Metric | Description |
|---|---|
| Avg Compaction Time | The average time taken to process compaction operations in the region server |
| Compaction Queue Size | The total number of compaction operations waiting to be processed in the region server |
| Num Compaction Running | The total number of compactions being processed in the region server |
Table
The following table describes the Table tile.
| Metric | Description |
|---|---|
| # Tables | The total number of tables in the cluster |
| Table Size [Min, Max] | The total size of the data for the table |
| Table Request [Min, Max] | The total number of read and write requests per second for the table |
Cache Metrics
The following table describes the Cache Metrics tile.
| Metrics | Description |
|---|---|
| Hit Ratio | The block cache hit ratio (0 to 100%) from Region Server |
| Avg Flush Time | The average latency for Flush Operation for the tables |
| Flush Queue Size | The size of the output file for Flush Operations for the tables |
Region Stats
The following table describes the Regions Stats tile.
| Metrics | Description |
|---|---|
| Online | The number of regions online |
| Offline | The number of regions offline NOTE You cannot read and write on Offline regions. If you disable any table, all regions in that table will move to offline state. |
| Failed | The number of failed regions NOTE All regions that are not in open state due to region metadata corruption or failure in the region server are considered as failed regions. |
| Split | The number of split regions. Regions split when they reach the configured threshold. |
| Others | The number of regions that are not in the above categories |
| Total | The sum of all the metrics in the Region Stats tile |
Charts on the Hbase Dashboard
The following table describes all the charts displayed in the HBase Dashboard.
| Chart Name | Description |
|---|---|
| Region & Table Distribution | Displays the following charts:
|
| Cluster JVM Usage (95th percentile) | Region server Heap plays a critical role in holding Hbase Region’s memstore and high heap utilization, can cause frequent flush which can impact write latencies directly as it involves disk i/o. Click Show Individual to view individual JVM Usage metrics in the region server. Click Show Aggregated to view a consolidated chart of all JVM Usage metrics in the HBase cluster. |
| Request Count | Request Count chart is a time series chart that displays the number of requests(reads and writes) sent by all the regions servers at a particular time. Click Show Individual to view individual server region request count in the region server. Click Show Aggregated to view a consolidated chart of all request counts for all region servers in the HBase cluster. |
| Region Latency Timeline (95th percentile) | It is a time series chart that displays the time taken by HBase region servers to process your request. Click the down arrow key to select the following request types:
|
| Region Load | It is a histogram chart displaying the read and write request count for all region servers in the cluster. |
| Connections | It is a bar chart displaying the number of open connections in a region server. |
| Request Handlers | It is bar chart displaying the number of request handlers in a region server. |
| Compaction Times & Duration | It is a histogram chart displaying the number of compactions run and the duration of the compaction |
| RPC Time & Process Time - 95th percentile | It is a histogram chart displaying the processing time and queue time of a region server. |
Compaction Region Server
The following table describes the Compaction Region Server metrics.
| Metric | Description |
|---|---|
| Region Server | The name or ID of the region server |
| Compacting KVs | The number of key values in compacting state |
| Compacted KVs | The number of key values that have finished compacting |
| Compaction Progress | The compaction progress, expressed as a percentage |