In addition, if your table is partitioned, then you must add any new partitions or remove deleted partitions by following the same process as described in the preceding step. Hence, if concurrent writes are expected and you want to avoid stale manifests, you should consider explicitly updating the manifest after the expected write operations have completed. With such unordered writes, the manifest files are not guaranteed to point to the latest version of the table after the write operations complete. For example, if automatic mode is enabled, concurrent write operations lead to concurrent overwrites to the manifest files. Whether to update automatically or explicitly depends on the concurrent nature of write operations on the Delta table and the desired data consistency. Therefore, you should explicitly run GENERATE to update manifests for the entire table immediately after enabling automatic mode. However, this also means that if the manifests in other partitions are stale, enabling automatic mode will not automatically fix it. This incremental update ensures that the overhead of manifest generation is low for write operations. Set up a Redshift Spectrum to Delta Lake integration and query Delta tablesĪfter enabling automatic mode on a partitioned table, each write operation updates only manifests corresponding to the partitions that operation wrote to.Redshift Spectrum to Delta Lake integration.Presto, Trino, and Athena to Delta Lake integration using manifests.Access Delta tables from external data processing engines.How does Delta Lake manage feature compatibility?.
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