László Pintér created HIVE-26657:
------------------------------------
Summary: [Iceberg] Filter out the metadata.json file when
migrating
Key: HIVE-26657
URL: https://issues.apache.org/jira/browse/HIVE-26657
Project: Hive
Issue Type: Bug
Reporter: László Pintér
Assignee: László Pintér
When migrating a hive table to an iceberg in certain cases a Runtime exception
is raised
{code:java}
ERROR : Failed
java.lang.RuntimeException:
s3a://dev-nfqe-base/cc-cdw-nfqe-q7wj9a/archive/env-8pt556/parquet/bakeoff/large/pli/metadata/00000-94fffe5c-c307-4341-9ea3-f5fa4863d301.metadata.json
is not a Parquet file. Expected magic number at tail, but found [32, 93, 10,
125]
{code}
The hive-to-iceberg table migration has the following logic.
1. In order to walk through all the data files we request a file iterator from
the filesystem. This iterator will provide all the references to be able to
scan the data files.
2. The new iceberg table is created, meaning that a new entry is added to the
hive catalog and on the file system level the metadata directory is created
together with the first metadata file (*.metadata.json)
3. All the data files are scanned and the manifests are created.
The issue occurs when there are so many data files that it doesn't fit into
memory in one go. So in step 3 when we walk through the data files list, the
iterator has to run another round of file listing that reads up the content of
the metadata directory that was created in step 2.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
