Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/18811 )

Change subject: IMPALA-11469: Make prefix of ignored staging dirs configurable
......................................................................

IMPALA-11469: Make prefix of ignored staging dirs configurable

External systems like Hive or Spark will write temporary or "non-data"
files in the table location. Catalogd will skip them when loading file
metadata. However, the prefix is currently hard coded. We recently found
that Spark streaming will generated a _spark_metadata dir which is not
handled correctly.

To avoid future code changes when interact with more systems, this patch
adds a new startup flag, ignored_dir_prefix_list, for catalogd. It's a
comma separated list for the prefix of ignored dirs. Currently, the
default value is ".,_tmp.,_spark_metadata". Users can add more in the
future.

Tests:
 - Add a case for _spark_metadata in FileSystemUtilTest

Change-Id: I108bfa823281a35d28932f7ccce0b12a0c5af57d
Reviewed-on: http://gerrit.cloudera.org:8080/18811
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/util/backend-gflag-util.cc
M common/thrift/BackendGflags.thrift
M fe/src/main/java/org/apache/impala/common/FileSystemUtil.java
M fe/src/main/java/org/apache/impala/service/BackendConfig.java
M fe/src/test/java/org/apache/impala/common/FileSystemUtilTest.java
5 files changed, 49 insertions(+), 8 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I108bfa823281a35d28932f7ccce0b12a0c5af57d
Gerrit-Change-Number: 18811
Gerrit-PatchSet: 4
Gerrit-Owner: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Kurt Deschler <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>

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