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https://issues.apache.org/jira/browse/HBASE-7495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568775#comment-13568775
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Ted Yu commented on HBASE-7495:
-------------------------------
Glad to see latency come down for parallel seek.
w.r.t. changes in TestCoprocessorScanPolicy, you can use this annotation:
{code}
@RunWith(Parameterized.class)
{code}
And specify parameters with:
{code}
@Parameters
public static Collection<Object[]> parameters() {
{code}
Take a look at TestMiniClusterLoadSequential.
This is how HRegionServer starts ExecutorService:
{code}
this.service.startExecutorService(ExecutorType.RS_OPEN_REGION,
conf.getInt("hbase.regionserver.executor.openregion.threads", 3));
{code}
Do you think adding another ExecutorType enum and using the above pattern is
better ?
> parallel seek in StoreScanner
> -----------------------------
>
> Key: HBASE-7495
> URL: https://issues.apache.org/jira/browse/HBASE-7495
> Project: HBase
> Issue Type: Bug
> Components: Scanners
> Affects Versions: 0.94.3, 0.96.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Attachments: HBASE-7495.txt, HBASE-7495.txt, HBASE-7495.txt,
> HBASE-7495-v2.txt, HBASE-7495-v3.txt, HBASE-7495-v4.txt, HBASE-7495-v4.txt,
> HBASE-7495-v5.txt, HBASE-7495-v6.txt, HBASE-7495-v7.txt, HBASE-7495-v8.txt
>
>
> seems there's a potential improvable space before doing scanner.next:
> {code:title=StoreScanner.java|borderStyle=solid}
> if (explicitColumnQuery && lazySeekEnabledGlobally) {
> for (KeyValueScanner scanner : scanners) {
> scanner.requestSeek(matcher.getStartKey(), false, true);
> }
> } else {
> for (KeyValueScanner scanner : scanners) {
> scanner.seek(matcher.getStartKey());
> }
> }
> {code}
> we can do scanner.requestSeek or scanner.seek in parallel, instead of current
> serialization, to reduce latency for special case.
> Any ideas on it ? I'll have a try if the comments/suggestions are positive：）
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