[HIVE-11327] HiveQL to HBase - Predicate Pushdown for composite key not working

• Type: Bug
• Status: Open
• Priority: Blocker
• Resolution: Unresolved
• Affects Version/s: 0.14.0
• Component/s: HBase Handler, Hive
• Tags: hive, predicatepushdown, hbase
• Assignee: Unassigned
• Reporter: Yannik Zuehlke
• Created: 21/Jul/15 12:10
• Updated: 26/Jul/15 03:59

Description

I am using Hive 0.14 and Hbase 0.98.8 I would like to use HiveQL for accessing a HBase "table".

I created a table with a complex composite rowkey:

---

CREATE EXTERNAL TABLE db.hive_hbase (rowkey struct<p1:string, p2:string, p3:string>, column1 string, column2 string)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
COLLECTION ITEMS TERMINATED BY ';'
STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
WITH SERDEPROPERTIES ("hbase.columns.mapping" =
":key,cf:c1,cf:c2")
TBLPROPERTIES("hbase.table.name"="hbase_table");

---

The table is getting successfully created, but the HiveQL query is taking forever:

---

SELECT * from db.hive_hbase WHERE rowkey.p1 = 'xyz';

---

I am working with 1 TB of data (around 1,5 bn records) and this queries takes forever (It ran over night, but did not finish in the morning).

I changed the log4j properties to 'DEBUG' and found some interesting information:

---

2015-07-15 15:56:41,232 INFO ppd.OpProcFactory (OpProcFactory.java:logExpr(823)) - Pushdown Predicates of FIL For Alias : hive_hbase
2015-07-15 15:56:41,232 INFO ppd.OpProcFactory (OpProcFactory.java:logExpr(826)) - (rowkey.p1 = 'xyz')

---

But some lines later:

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2015-07-15 15:56:41,430 DEBUG ppd.OpProcFactory (OpProcFactory.java:pushFilterToStorageHandler(1051)) - No pushdown possible for predicate: (rowkey.p1 = 'xyz')

---

So my guess is: HiveQL over HBase does not do any predicate pushdown but starts a MapReduce job.

The normal HBase scan (via the HBase Shell) takes around 5 seconds.