The Replication Node manages the data in a NoSQL DB store and is the main consumer of memory. The Java heap and cache size used by the Replication Node can be important performance factors. By default, the Replication Node heap and cache are calculated by NoSQL DB based on the amount of memory available to the Storage Node.
We recommend that you specify the available memory for a Storage Node using the -memory_mb flag for makebootconfig, or the memory_mb Storage Node parameter. If you do not define memory_mb, it will default to the memory available on the node. NoSQL DB will then use 85% of memory_mb as the heap for the Replication Node processes hosted by that Storage Node. If the Storage Node hosts more than one Replication Node, the memory will be divided evenly between all RNs.
If the number of Replication Nodes on a Storage Node changes, the per-RN memory will be recalculated dynamically. The percentage used for heap is controlled by the rnHeapPercent Storage Node parameter. You can choose to override the default value of 85%.Each Replication Node uses a cache, and the size of that cache defaults to 70% of the Replication Node heap. You can override the 70% default by setting the rnCachePercent Replication Node parameter.
The Replication Node heap can also be specified directly by setting the -Xmx in the Replication Node javaMiscParams parameter. Likewise, the Replication Node cache can be set directly with the cache Size Replication Node parameter. While that’s possible, it’s advisable to use the Storage Node memory_mb setting.
Posted Date:- 2021-11-13 05:14:04
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