Tianyi Wang has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/10792 )

Change subject: IMPALA-3040: Remove cache directives if a partition is dropped 
externally
......................................................................

IMPALA-3040: Remove cache directives if a partition is dropped externally

HdfsTable.dropPartition() doesn't uncache the partition right now. If
the partition is dropped from Hive and refreshed in Impala, the
partition will be removed from the catalog but the cache directive
remains. Because Impala directly uses HMS client to drop a
table/database, the cache directive won't be removed even if the table
is dropped in Impala, if the backgroud loading is run concurrenty with
the HMS client RPC call. This patch removes the cache directive in
dropPartition() if the partition is removed from HMS.

Change-Id: Id7701a499405e961456adea63f3592b43bd69170
Reviewed-on: http://gerrit.cloudera.org:8080/10792
Reviewed-by: Bharath Vissapragada <[email protected]>
Tested-by: Tianyi Wang <[email protected]>
---
M fe/src/main/java/org/apache/impala/catalog/HdfsTable.java
M fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java
M tests/query_test/test_hdfs_caching.py
3 files changed, 49 insertions(+), 13 deletions(-)

Approvals:
  Bharath Vissapragada: Looks good to me, approved
  Tianyi Wang: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Id7701a499405e961456adea63f3592b43bd69170
Gerrit-Change-Number: 10792
Gerrit-PatchSet: 13
Gerrit-Owner: Tianyi Wang <[email protected]>
Gerrit-Reviewer: Bharath Vissapragada <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Tianyi Wang <[email protected]>

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