GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/6012
[SPARK-7447][SQL] Don't re-merge Parquet schema when the relation is
deserialized
JIRA: https://issues.apache.org/jira/browse/SPARK-7447
`MetadataCache` in `ParquetRelation2` is annotated as `@transient`. When
`ParquetRelation2` is deserialized, we ask `MetadataCache` to refresh and
perform schema merging again. It is time-consuming especially for very many
parquet files.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 without_remerge_schema
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6012.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #6012
----
commit b0fc09bb7164ce94c52da4d50415fd6616d790b6
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-05-08T17:15:37Z
Don't generate and merge parquetSchema multiple times.
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
