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https://issues.apache.org/jira/browse/IMPALA-13598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltán Borók-Nagy resolved IMPALA-13598.
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Target Version: Impala 4.5.0
Resolution: Fixed
> OPTIMIZE redundantly accumulates memory in HDFS WRITER
> ------------------------------------------------------
>
> Key: IMPALA-13598
> URL: https://issues.apache.org/jira/browse/IMPALA-13598
> Project: IMPALA
> Issue Type: Bug
> Reporter: Zoltán Borók-Nagy
> Assignee: Zoltán Borók-Nagy
> Priority: Major
> Labels: impala-iceberg
>
> When we have an Iceberg table that have lots of partitions, and we want to
> compact the table via OPTIMIZE, it will use much more memory than needed.
> Repro steps:
> {noformat}
> create table tmp_ice_tpch
> partitioned by spec(truncate(500, l_orderkey))
> stored by iceberg as
> select * from tpch.lineitem;
> OPTIMIZE TABLE tmp_ice_tpch;
> # We likely get a Memory Limit Exceeded error here{noformat}
> Currently OPTIMIZE uses INSERT OVERWRITE under the hood:
> {noformat}
> INSERT OVERWRITE tmp_ice_tpch SELECT * FROM tmp_ice_tpch;{noformat}
> But INSERT OVERWRITE doesn't accumulate the memory.
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