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https://issues.apache.org/jira/browse/BEAM-8825?focusedWorklogId=359511&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-359511
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ASF GitHub Bot logged work on BEAM-8825:
----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Dec/19 17:13
Start Date: 13/Dec/19 17:13
Worklog Time Spent: 10m
Work Description: udim commented on issue #10380: [BEAM-8825] Add limit
on number of mutated rows to batching/sorting stages.
URL: https://github.com/apache/beam/pull/10380#issuecomment-565523737
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Issue Time Tracking
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Worklog Id: (was: 359511)
Time Spent: 1h 10m (was: 1h)
> OOM when writing large numbers of 'narrow' rows
> -----------------------------------------------
>
> Key: BEAM-8825
> URL: https://issues.apache.org/jira/browse/BEAM-8825
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Affects Versions: 2.9.0, 2.10.0, 2.11.0, 2.12.0, 2.13.0, 2.14.0, 2.15.0,
> 2.16.0, 2.17.0
> Reporter: Niel Markwick
> Assignee: Niel Markwick
> Priority: Major
> Fix For: 2.18.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> SpannerIO can OOM when writing large numbers of 'narrow' rows.
>
> SpannerIO puts input mutation elements into batches for efficient writing.
> These batches are limited by number of cells mutated, and size of data
> written (5000 cells, 1MB data). SpannerIO groups enough mutations to build
> 1000 of these groups (5M cells, 1GB data), then sorts and batches them.
> When the number of cells and size of data is very small (<5 cells, <100
> bytes), the memory overhead of storing millions of mutations for batching is
> significant, and can lead to OOMs.
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