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https://issues.apache.org/jira/browse/HBASE-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-2106.
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Resolution: Cannot Reproduce
Not an issue in modern HBase versions
> Cache uses only 2G of heap no matter how much allocated?
> --------------------------------------------------------
>
> Key: HBASE-2106
> URL: https://issues.apache.org/jira/browse/HBASE-2106
> Project: HBase
> Issue Type: Bug
> Reporter: stack
>
> Here is a question from Adam Silberstein who is having trouble writing this
> list:
> "I'm running on a particular cluster of machines and seeing worse than
> expected performance. I've run on a different, but identical, cluster of
> machines and gotten about 2-4x better throughput and latency. I've checked
> all of the configuration settings and they are all the same. The only thing
> I observe that looks odd is the memory usage by each region server. I've
> allocated 6 GB heap space to each. There is a total of 20GB of records on
> each. When I use "top" to observe memory usage, I see that the region server
> process does have 6GB of virtual memory. When I start running a workload, I
> can see the amount of resident memory climbing. However, it always stops at
> 2GB. Since I have 20 GB on each region server, I'd expect the process to use
> all the memory allocated it
> "Is there a reasonable explanation for why it stops at 2GB, and/or has anyone
> seen this happen"
> I took a look at the cache code and I see that it has an int for maximum size
> in the constructor argument though internally its using a long for maximum
> size. I wonder if this is the issue?
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