Database Reference
In-Depth Information
What is new in Impala 1.2.0 (Beta)
At the time of writing this topic, Impala 1.2.0 Beta was available to test with CDH 5.0.
Impala 1.2.0 has several features visible to users; however, lots of other features are
under the hood to improve performance, security, and flexibility. A few notable fea-
tures are as follows:
• Impala supports
user-defined functions
(
UDF
) natively, and users can write
scalar UDF and
user-defined aggregate functions
(
UDA
).
• Functions written in C++ and Java can work with Impala as they are.
• Currently,
REFRESH
statements are required after every use of table-specific
SQL commands, such as
CREATE TABLE
,
ALTER TABLE
,
DROP TABLE
,
INSERT
, and
LOAD DATA
, to update information to the whole cluster. Impala
now has an automatic synchronization mechanism, so there is no need for
REFRESH
or
INVALIDATE METADATA
SQL commands. With the automatic
synchronization mechanism, a newly created service takes charge of updating
table or metadata specific information to the whole Impala cluster as the
changes are available.
• Another big update is integration with YARN, in which Impala uses the YARN
resource management framework for adequate resource management during
query processing.
Tip
According to Cloudera, Impala 1.2.0 Beta is packaged with Cloudera CDH 5.0
(Beta) and only works with Cloudera CDH 5.0. Please visit the following URL for
more details:
