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https://issues.apache.org/jira/browse/HIVE-25226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360701#comment-17360701
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Marton Bod commented on HIVE-25226:
-----------------------------------
As discussed with [~boroknagyz] this is currently the expected behaviour if
engine.hive.enabled is not set to true in the table properties. This will be
handled by: https://issues.apache.org/jira/browse/IMPALA-10741
> Hive changes 'storage_handler' for existing Iceberg table when
> hive.engine.enabled is false
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-25226
> URL: https://issues.apache.org/jira/browse/HIVE-25226
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltán Borók-Nagy
> Assignee: Marton Bod
> Priority: Major
> Labels: iceberg
>
> If Hive writes to an existing Iceberg table but property
> 'hive.engine.enabled' is not set, then Hive rewrites the table metadata with
> different SerDe/Input/Output format than it had before.
> E.g. there's an existing table with the following metadata:
> {noformat}
> storage_handler |
> org.apache.iceberg.mr.hive.HiveIcebergStorageHandler
> | SerDe Library: | org.apache.iceberg.mr.hive.HiveIcebergSerDe | NULL |
> | InputFormat: | org.apache.iceberg.mr.hive.HiveIcebergInputFormat | NULL |
> | OutputFormat: | org.apache.iceberg.mr.hive.HiveIcebergOutputFormat | NULL |
> {noformat}
> Now when Hive inserts to this table it clears 'storage_handler' and rewrites
> the rest:
> {noformat}
> | SerDe Library: |
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe | NULL
> |
> | InputFormat: | org.apache.hadoop.mapred.FileInputFormat
> | NULL |
> | OutputFormat: | org.apache.hadoop.mapred.FileOutputFormat
> | NULL |
> {noformat}
> This means the table becomes unreadable:
> {noformat}
> Error: java.io.IOException: java.io.IOException: Cannot create an instance of
> InputFormat class org.apache.hadoop.mapred.FileInputFormat as specified in
> mapredWork! (state=,code=0)
> {noformat}
> I think Hive should always set 'hive.engine.enabled' for Iceberg.
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