This tab covers HBase settings. Here you can set properties for the HBase Master and RegionServer, as well as some general and advanced properties. Click the name of the group to expand and collapse the display.
Table 3.14. HBase Settings: RegionServer
| Name | Notes |
|---|---|
| RegionServer hosts | This value is prepopulated based on your choices on previous screens. The hosts that have been assigned to run RegionServer. |
| HBase Region Servers maximum Java heap size |
Maximum Java heap size for HBase Region Servers (Java option -Xmx) Important: For more information on sizing, see Recommended Memory Configurations for the MapReduce Service for recommended sizing. |
|
HBase Region Server Handler |
Count of RPC Listener instances spun up on RegionServers |
| HBase Region Major Compaction |
The time between major compactions of all HStoreFiles in a region. Set to 0 to disable automated major compactions. |
| HBase Region Block Multiplier | Block updates if memstore reaches "Multiplier * HBase Region Memstore Flush
Size" bytes. Useful preventing runaway memstore size during spikes in update
traffic |
| HBase Region Memstore Flush Size |
Memstore will be flushed to disk if size of the memstore exceeds this number of bytes. |
Table 3.15. HBase Settings: General
| Name | Notes |
|---|---|
|
HBase HStore compaction threshold |
When HStoreFiles in any one HStore are greater than this number, a compaction is run to rewrite all HStoreFiles files as one. |
|
HFile block cache size |
Percentage of maximum heap (-Xmx setting) to allocate to block cache used by HFile/StoreFile. You can set this to 0 to disable but this is not a recommended practice. |
|
Maximum HStoreFile Size |
If any one of a column families' HStoreFiles grows to exceed this value, the hosting HRegion is split in two. |
|
HBase Client Scanner Caching |
Number of rows that will be fetched when calling |
|
Zookeeper timeout for HBase Session |
HBase passes this to the zk quorum as suggested maximum time for a session. |
|
HBase Client Maximum key-value Size |
Specifies the combined maximum allowed size of a KeyValue instance. It should be set to a fraction of the maximum region size. |
Table 3.16. HBase Settings: Advanced
| Name | Notes |
|---|---|
| HBase Log Dir | Directory for HBase logs |
| HBase PID Dir | Directory for the PID files for HBase processes |
| HDFS Short-circuit read | Check to enable |
| HDFS shortcircuit skip checksum | Skip checksum for short-circuit read. Check to enable |
| HDFS append support | Check to enable |
| hstore blocking storefiles | If more than this number of StoreFiles in any one Store (one StoreFile is written per flush
of MemStore), then updates are blocked in this HRegion until compaction is completed or until
hbase.hstore.blockingWaitTime is exceeded. |
| hbase.master.lease.thread.wakefrequency | The interval between checks for the expired region server leases. The default is 15 seconds but may be reduced so that the master notices a dead RegionServer more quickly. |
| hbase.superuser | Comma-separated list of users who are allowed full privileges across the cluster, regardless of stored ACLs. Used only when HBase security is enabled. |
| hbase.regionserver.optionalcacheflushinterval | Amount of time to wait since the last time a region was flushed before invoking an optional cache flush. Default is 60,000. |
| Custom HBase Configs | Use this text box to enter values for hbase-site.xml properties not exposed by the UI. Enter in "key=value" format, with a newline as a delimiter between pairs. |
