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Posted to issues@impala.apache.org by "Noemi Pap-Takacs (Jira)" <ji...@apache.org> on 2025/01/09 15:19:00 UTC

[jira] [Created] (IMPALA-13656) MERGE redundantly accumulates memory in HDFS WRITER

Noemi Pap-Takacs created IMPALA-13656:
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             Summary: MERGE redundantly accumulates memory in HDFS WRITER
                 Key: IMPALA-13656
                 URL: https://issues.apache.org/jira/browse/IMPALA-13656
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
            Reporter: Noemi Pap-Takacs
            Assignee: Noemi Pap-Takacs
             Fix For: Impala 4.5.0


When we want to merge Iceberg tables that have lots of partitions, the execution will use much more memory than needed, possibly resulting in a Memory Limit Exceeded error.

It happens because when IcebergMergeImpl creates the insert table sink it doesn't set 'inputIsClustered' to true. Therefore HdfsTableSink expects random input and keeps the output writers open for every partition, which results in high memory consumption.



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