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[docs] Add doc for hive.copy-on-first-write-configuration-enabled #25443

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imjalpreet merged 1 commit into from
Jul 16, 2025
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[docs] Add doc for hive.copy-on-first-write-configuration-enabled #25443

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15 changes: 15 additions & 0 deletions presto-docs/src/main/sphinx/connector/hive.rst
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Expand Up @@ -210,7 +210,22 @@ Property Name Description
``hive.metastore.catalog.name`` Specifies the catalog name to be passed to the metastore.

``hive.experimental.symlink.optimized-reader.enabled`` Experimental: Enable optimized SymlinkTextInputFormat reader ``true``

``hive.copy-on-first-write-configuration-enabled`` Optimize the number of configuration copies by enabling ``false``
copy-on-write technique.

CopyOnFirstWriteConfiguration acts as a wrapper around the
standard Hadoop Configuration object, extending its
behaviour by introducing an additional layer of
indirection. However, many third-party libraries that
integrate with Presto rely directly on the Configuration
copy `constructor`_. Since this constructor does not
recognise or account for the wrapped nature of
CopyOnFirstWriteConfiguration, it can result in silent
failures where critical configuration properties are not
correctly propagated.
======================================================== ============================================================ ============
.. _constructor: https://github.com/apache/hadoop/blob/02a9190af5f8264e25966a80c8f9ea9bb6677899/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L844-L875

Avro Configuration Properties
-----------------------------
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