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Posted to issues@hbase.apache.org by "Chia-Ping Tsai (JIRA)" <ji...@apache.org> on 2017/04/22 20:26:04 UTC
[jira] [Commented] (HBASE-9899) for idempotent operation dups,
return the result instead of throwing conflict exception
[ https://issues.apache.org/jira/browse/HBASE-9899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980118#comment-15980118 ]
Chia-Ping Tsai commented on HBASE-9899:
---------------------------------------
hi [~zghaobac]
We forget to pass the nonce/nonceGroup into the scanner in branch-1.
{code}
protected RegionScanner instantiateRegionScanner(Scan scan,
List<KeyValueScanner> additionalScanners, long nonceGroup, long nonce) throws IOException {
if (scan.isReversed()) {
if (scan.getFilter() != null) {
scan.getFilter().setReversed(true);
}
return new ReversedRegionScannerImpl(scan, additionalScanners, this);
}
return new RegionScannerImpl(scan, additionalScanners, this);
}
{code}
Would you please fix it? Otherwise, we will break the idempotent. (The duplicate append will see the different version of data)
FYI [~stack]
> for idempotent operation dups, return the result instead of throwing conflict exception
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-9899
> URL: https://issues.apache.org/jira/browse/HBASE-9899
> Project: HBase
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Guanghao Zhang
> Fix For: 2.0.0, 1.3.0, 1.4.0
>
> Attachments: HBASE-9899-addendum.patch, HBASE-9899-branch-1.patch, HBASE-9899-branch-1.patch, HBASE-9899-branch-1.patch, HBASE-9899-v1.patch, HBASE-9899-v2.patch, HBASE-9899-v3.patch, HBASE-9899-v3.patch, HBASE-9899-v4.patch, HBASE-9899-v4.patch
>
>
> After HBASE-3787, we could store mvcc in operation context, and use it to convert the modification request into read on dups instead of throwing OperationConflictException.
> MVCC tracking will have to be aware of such MVCC numbers present. Given that scanners are usually relatively short-lived, that would prevent low watermark from advancing for quite a bit more time
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