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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2018/07/24 23:57:00 UTC
[jira] [Assigned] (HBASE-20932) Effective MemStoreSize::hashCode()
[ https://issues.apache.org/jira/browse/HBASE-20932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Yu reassigned HBASE-20932:
------------------------------
Assignee: Mingliang Liu
> Effective MemStoreSize::hashCode()
> -----------------------------------
>
> Key: HBASE-20932
> URL: https://issues.apache.org/jira/browse/HBASE-20932
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.2
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Priority: Major
> Attachments: HBASE-20932.001.patch
>
>
> After HBASE-20411 we have
> {code:java|title=MemStoreSize::hashCode()}
> @Override
> public int hashCode() {
> long h = 31 * this.dataSize;
> h = h + 31 * this.heapSize;
> h = h + 31 * this.offHeapSize;
> return (int) h;
> }
> {code}
> This is not effective {{hashCode()}} implementation. Instead we can use:
> {code:java|title=MemStoreSize::hashCode()}
> @Override
> public int hashCode() {
> long h = this.dataSize;
> h = h * 31 + this.heapSize;
> h = h * 31 + this.offHeapSize;
> return (int) h;
> }
> {code}
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