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https://issues.apache.org/jira/browse/HBASE-18485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16110670#comment-16110670
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Ted Yu commented on HBASE-18485:
--------------------------------
{code}
+ Thread prefetcher = new Thread(prefetchRunnable);
{code}
prefetcher should be background thread.
{code}
+ private long resultSize2CacheSize(long maxResultSize) {
+ // * 2 if possible
{code}
What's the rationale behind the doubling ?
{code}
+ throw new InterruptedIOException();
{code}
Better add some message to the exception.
> 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 |
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