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https://issues.apache.org/jira/browse/HBASE-7495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13567508#comment-13567508
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Liang Xie commented on HBASE-7495:
----------------------------------
Uploaded patch v6, move the MVCC setThreadReadPoint from ScannerSeekWorker
constructor into call block
For passing config object, seems it need to add a new param in StoreScanner's
constructor, and probably need to repair many broken test cases? In my patch,
it's initialized just one time in *static* block, i think it's fine as well.
[[email protected]], if we move the ExecutorService to HRegionServer class,
we need to expose it with *static* getter, right? since in StoreScanner class,
we could not get the current HRegionServer instance easily in current codebase.
but if we add a static getter method, it'll bring several FindBug warnings.
> 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
>
>
> 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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