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https://issues.apache.org/jira/browse/HBASE-17245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-17245:
-----------------------------------
Summary: Replace HTableDescriptor#htd.getColumnFamilies().length with a
low-cost implementation (was: replace
HTableDescriptor#htd.getColumnFamilies().length with a low-cost implementation)
> Replace HTableDescriptor#htd.getColumnFamilies().length with a low-cost
> implementation
> --------------------------------------------------------------------------------------
>
> Key: HBASE-17245
> URL: https://issues.apache.org/jira/browse/HBASE-17245
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: huaxiang sun
> Assignee: huaxiang sun
> Priority: Minor
> Attachments: HBASE-17245-master-001.patch
>
>
> Found quite a few places doing something like
> {code}
> if (htd.getColumnFamilies().length == 0) {
> {code}
> HTableDescriptor#htd.getColumnFamilies() does a few memory allocations. The
> purpose is to get the family number, it can be replaced with
> {code}
> + public int getColumnFamilyCount() {
> + return families.size();
> + }
> {code}
> in HTableDescriptor which does not need these memory allocations.
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