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new 490547e [HIVEMALL-247][DOC] Recommend
hive.optimize.cte.materialize.threshold=2 in Hive tuning tips
490547e is described below
commit 490547ea48070949c8df2b0646d1056b7a2acbf0
Author: Makoto Yui <m...@apache.org>
AuthorDate: Fri Apr 12 16:02:17 2019 +0900
[HIVEMALL-247][DOC] Recommend hive.optimize.cte.materialize.threshold=2 in
Hive tuning tips
## What changes were proposed in this pull request?
Recommend `hive.optimize.cte.materialize.threshold=2` in Hive tuning tips
## What type of PR is it?
Documentation
## What is the Jira issue?
https://issues.apache.org/jira/browse/HIVEMALL-247
Author: Makoto Yui <m...@apache.org>
Closes #188 from myui/HIVEMALL-247.
---
docs/gitbook/tips/hadoop_tuning.md | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/docs/gitbook/tips/hadoop_tuning.md
b/docs/gitbook/tips/hadoop_tuning.md
index 167a068..77d278f 100644
--- a/docs/gitbook/tips/hadoop_tuning.md
+++ b/docs/gitbook/tips/hadoop_tuning.md
@@ -83,6 +83,10 @@ feature_dimensions (assume here 2^25) * 2 bytes (short) * 2
(iff covariance is c
Note: Hivemall uses a [sparse
representation](https://github.com/apache/incubator-hivemall/blob/master/core/src/main/java/hivemall/model/SparseModel.java)
of prediction model (using a hash table) by the default. Use
"[-densemodel](https://github.com/apache/incubator-hivemall/blob/master/core/src/main/java/hivemall/LearnerBaseUDTF.java#L87)"
option to use a dense model.
+# Enable CTE materialization
+
+[Hive 2.1.0 or later](https://issues.apache.org/jira/browse/HIVE-11752)
support CTE materialization through `hive.optimize.cte.materialize.threshold`
option and it's recommended to `set hive.optimize.cte.materialize.threshold=2`
when using Hivemall.
+
# Execution Engine of Hive
We recommend to use Apache Tez for execute engine of Hive for Hivemall queries.
