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Posted to commits@hudi.apache.org by "nonggia.liang (Jira)" <ji...@apache.org> on 2022/09/02 02:19:00 UTC
[jira] [Updated] (HUDI-4769) Option read.streaming.skip_compaction skips delta commit
[ https://issues.apache.org/jira/browse/HUDI-4769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
nonggia.liang updated HUDI-4769:
--------------------------------
Description:
Option read.streaming.skip_compaction was introduced to avoid consuming duplicate data from delta-commits and compactions in MOR table.
But the option may cause delta-commits, here the case:
Support we have a timeline (d for delta-commit, C for compaction/commit):
d1 --> d2 --> C3 --> d4 --> d5 -->
t1.......................................................t2..........
Let's say scans for streaming read happen at time t1 and t2, when d1 and d5 is the latest instant seperately.
When we scan at t2 with read.streaming.skip_compaction=true, we get a latest merged fileslice with only log files containing d4+d5. So d2 is skipped.
was:
Option read.streaming.skip_compaction was introduced to avoid consuming duplicate data from delta-commits and compactions in MOR table.
But the option may cause delta-commits, here the case:
Support we have a timeline (d for delta-commit, C for compaction/commit):
d1 --> d2 --> C3 --> d3 --> d4 -->
t1.......................................................t2..........
Let's say scans for streaming read happen at time t1 and t2, when d1 and d4 is the latest instant seperately.
When we scan at t2 with read.streaming.skip_compaction=true, we get a latest merged fileslice with only log files containing d3+d4. So d2 is skipped.
> Option read.streaming.skip_compaction skips delta commit
> --------------------------------------------------------
>
> Key: HUDI-4769
> URL: https://issues.apache.org/jira/browse/HUDI-4769
> Project: Apache Hudi
> Issue Type: Bug
> Components: flink, flink-sql
> Reporter: nonggia.liang
> Priority: Major
>
> Option read.streaming.skip_compaction was introduced to avoid consuming duplicate data from delta-commits and compactions in MOR table.
> But the option may cause delta-commits, here the case:
> Support we have a timeline (d for delta-commit, C for compaction/commit):
> d1 --> d2 --> C3 --> d4 --> d5 -->
> t1.......................................................t2..........
> Let's say scans for streaming read happen at time t1 and t2, when d1 and d5 is the latest instant seperately.
> When we scan at t2 with read.streaming.skip_compaction=true, we get a latest merged fileslice with only log files containing d4+d5. So d2 is skipped.
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