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Posted to dev@phoenix.apache.org by "Istvan Toth (Jira)" <ji...@apache.org> on 2021/01/15 11:59:00 UTC
[jira] [Updated] (PHOENIX-5562) Simplify detection of concurrent
updates on data tables with indexes
[ https://issues.apache.org/jira/browse/PHOENIX-5562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Istvan Toth updated PHOENIX-5562:
---------------------------------
Fix Version/s: 5.1.0
> Simplify detection of concurrent updates on data tables with indexes
> --------------------------------------------------------------------
>
> Key: PHOENIX-5562
> URL: https://issues.apache.org/jira/browse/PHOENIX-5562
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.1.0
> Reporter: Kadir OZDEMIR
> Assignee: Kadir OZDEMIR
> Priority: Major
> Fix For: 5.1.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> From the consistent secondary indexing design (PHOENIX-5156) perspective, two or more updates on the same row are concurrent updates if and only if all of them have acquired the row lock for reading the data table row before any of of them acquires the row lock the second time for updating the data table. In other words, all of them are in the first update phase concurrently.
> In the current implementation, these updates can detect the existence of each other in two places
> (1) after acquiring the lock to read the existing row on the data table
> (2) after acquiring the row lock to update the data table
> This allows all the concurrent updates to detect each other and complete first two update phases but skip the last update phase. This means the data table row will be updated by these updates but the corresponding index table rows will be left with the unverified status. Then, the read repair process will repair these unverified index rows during scans.
> The detection of concurrent updates can be simplified and done one in one place, i.e., after acquiring the row lock to update the data table.
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