[
https://issues.apache.org/jira/browse/HBASE-18485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16110925#comment-16110925
]
Guanghao Zhang commented on HBASE-18485:
----------------------------------------
bq. prefetcher should be background thread.
You mean?
bq. What's the rationale behind the doubling
This is same with AsyncTableResultScanner. I thought doubling is good, too.
> Performance issue: ClientAsyncPrefetchScanner is slower than
> ClientSimpleScanner
> --------------------------------------------------------------------------------
>
> Key: HBASE-18485
> URL: https://issues.apache.org/jira/browse/HBASE-18485
> Project: HBase
> Issue Type: Bug
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Attachments: HBASE-18485-v1.patch, HBASE-18485-v2.patch
>
>
> Copied the test result from HBASE-17994.
> {code}
> ./bin/hbase org.apache.hadoop.hbase.PerformanceEvaluation --rows=100000
> --nomapred scan 1
> ./bin/hbase org.apache.hadoop.hbase.PerformanceEvaluation --rows=100000
> --nomapred --asyncPrefetch=True scan 1
> {code}
> Mean latency.
> || ||Test1|| Test2 || Test3 || Test4|| Test5||
> |scan| 12.21 | 14.32 | 13.25 | 13.07 | 11.83 |
> |scan with prefetch=True | 37.36 | 37.88 | 37.56 | 37.66 | 38.28 |
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
