GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/17319
[SPARK-19765][SPARK-18549][SPARK-19093][SPARK-19736][BACKPORT-2.1][SQL]
Backport Three Cache-related PRs to Spark 2.1
### What changes were proposed in this pull request?
Backport a few cache related PRs:
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[[SPARK-19093][SQL] Cached tables are not used in
SubqueryExpression](https://github.com/apache/spark/pull/16493)
Consider the plans inside subquery expressions while looking up cache
manager to make
use of cached data. Currently CacheManager.useCachedData does not consider
the
subquery expressions in the plan.
---
[[SPARK-19736][SQL] refreshByPath should clear all cached plans with the
specified path](https://github.com/apache/spark/pull/17064)
Catalog.refreshByPath can refresh the cache entry and the associated
metadata for all dataframes (if any), that contain the given data source path.
However, CacheManager.invalidateCachedPath doesn't clear all cached plans
with the specified path. It causes some strange behaviors reported in
SPARK-15678.
---
[[SPARK-19765][SPARK-18549][SQL] UNCACHE TABLE should un-cache all cached
plans that refer to this table](https://github.com/apache/spark/pull/17097)
When un-cache a table, we should not only remove the cache entry for this
table, but also un-cache any other cached plans that refer to this table. The
following commands trigger the table uncache: `DropTableCommand`,
`TruncateTableCommand`, `AlterTableRenameCommand`, `UncacheTableCommand`,
`RefreshTable` and `InsertIntoHiveTable`
This PR also includes some refactors:
- use java.util.LinkedList to store the cache entries, so that it's safer
to remove elements while iterating
- rename invalidateCache to recacheByPlan, which is more obvious about what
it does.
### How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark backport-17097
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17319.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 #17319
----
commit 3f1895f315ef357ec9f9201748d760293deb4f88
Author: Xiao Li <[email protected]>
Date: 2017-03-16T07:36:35Z
fix.
commit 11a8f31d5954c14eb8e546d001688f93357da676
Author: Xiao Li <[email protected]>
Date: 2017-03-16T17:35:21Z
Merge remote-tracking branch 'upstream/branch-2.1' into backport-17097
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