Yaroslav Tkachenko created SPARK-30616:
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Summary: Introduce TTL config option for SQL Parquet Metadata Cache
Key: SPARK-30616
URL: https://issues.apache.org/jira/browse/SPARK-30616
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.4, 3.0.0
Reporter: Yaroslav Tkachenko
>From
>[documentation|https://spark.apache.org/docs/2.4.4/sql-data-sources-parquet.html#metadata-refreshing]:
{quote}Spark SQL caches Parquet metadata for better performance. When Hive
metastore Parquet table conversion is enabled, metadata of those converted
tables are also cached. If these tables are updated by Hive or other external
tools, you need to refresh them manually to ensure consistent metadata.
{quote}
Unfortunately simply submitting "REFRESH TABLE" commands could be very
cumbersome. Assuming frequently generated new Parquet files, hundreds of tables
and dozens of users querying the data (and expecting up-to-date results),
manually refreshing metadata for each table is not an optimal solution. And
this is a pretty common use-case for streaming ingestion of data.
I propose to introduce a new option in Spark (something like
"spark.sql.parquet.metadataCache.refreshInterval") that controls the TTL of
this metadata cache. Its default value can be pretty high (an hour? a few
hours?), so it doesn't alter the existing behavior much. When it's set to 0 the
cache is effectively disabled (could be useful for testing or some edge cases).
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