Fokko commented on PR #363:
URL: https://github.com/apache/iceberg-python/pull/363#issuecomment-2209468950
Another test with `commit.manifest.min-count-to-merge` set to 100, and doing
500 append operations:
```
avro-tools tojson
/tmp/some.db/woooo/metadata/snap-3952911087333379496-0-27b9a632-7ee0-4246-aaf2-fc6d8cb1dce5.avro
{"manifest_path":"/tmp/some.db/woooo/metadata/27b9a632-7ee0-4246-aaf2-fc6d8cb1dce5-m0.avro","manifest_length":5125,"partition_spec_id":0,"content":0,"sequence_number":500,"min_sequence_number":500,"added_snapshot_id":3952911087333379496,"added_files_count":1,"existing_files_count":0,"deleted_files_count":0,"added_rows_count":3,"existing_rows_count":0,"deleted_rows_count":0,"partitions":{"array":[]},"key_metadata":null}
{"manifest_path":"/tmp/some.db/woooo/metadata/dac5af38-f01b-4a59-9e4c-b14a26706e75-m0.avro","manifest_length":5126,"partition_spec_id":0,"content":0,"sequence_number":499,"min_sequence_number":499,"added_snapshot_id":8943105647176444976,"added_files_count":1,"existing_files_count":0,"deleted_files_count":0,"added_rows_count":3,"existing_rows_count":0,"deleted_rows_count":0,"partitions":{"array":[]},"key_metadata":null}
{"manifest_path":"/tmp/some.db/woooo/metadata/ed164af5-dda7-4e3e-9b67-fcb2fd78771b-m0.avro","manifest_length":5125,"partition_spec_id":0,"content":0,"sequence_number":498,"min_sequence_number":498,"added_snapshot_id":723002263384967579,"added_files_count":1,"existing_files_count":0,"deleted_files_count":0,"added_rows_count":3,"existing_rows_count":0,"deleted_rows_count":0,"partitions":{"array":[]},"key_metadata":null}
{"manifest_path":"/tmp/some.db/woooo/metadata/e2d3e14e-8caf-4ca0-9515-c0a19c2a5658-m0.avro","manifest_length":5126,"partition_spec_id":0,"content":0,"sequence_number":497,"min_sequence_number":497,"added_snapshot_id":6977509396340474362,"added_files_count":1,"existing_files_count":0,"deleted_files_count":0,"added_rows_count":3,"existing_rows_count":0,"deleted_rows_count":0,"partitions":{"array":[]},"key_metadata":null}
{"manifest_path":"/tmp/some.db/woooo/metadata/3cc77cfe-b68c-4071-9f70-41cc3933f0af-m1.avro","manifest_length":222800,"partition_spec_id":0,"content":0,"sequence_number":496,"min_sequence_number":1,"added_snapshot_id":7132518699806947299,"added_files_count":1,"existing_files_count":495,"deleted_files_count":0,"added_rows_count":3,"existing_rows_count":1485,"deleted_rows_count":0,"partitions":{"array":[]},"key_metadata":null}
```
I don't think it merges the manifests as it should:
```
➜ iceberg-python git:(manifest_compaction) avro-tools tojson
/tmp/some.db/woooo/metadata/3cc77cfe-b68c-4071-9f70-41cc3933f0af-m1.avro | wc
-l
24/07/04 21:04:14 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
496
➜ iceberg-python git:(manifest_compaction) avro-tools tojson
/tmp/some.db/woooo/metadata/27b9a632-7ee0-4246-aaf2-fc6d8cb1dce5-m0.avro | wc -l
24/07/04 21:04:28 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
1
```
I would expect the manifest-entries to be distributed more evenly over the
manifests to ensure maximum parallelization.
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