Details
Critical Description
The following query:
SELECT appl_user_id, arsn_cd, COUNT(*) as RecordCount FROM adw.crc_arsn GROUP BY appl_user_id,arsn_cd ORDER BY appl_user_id;
runs consistently fast in Spark and Mapreduce on Hive 1.2.0. When attempting to run this same query against Tez as the execution engine it consistently runs for over 300-500 seconds this seems extremely long. This is a basic external table delimited by tabs and is a single file in a folder. In Hive 0.13 this query with Tez runs fast and I tested with Hive 0.14, 0.14.1/1.0.0 and now Hive 1.2.0 and there clearly is something going awry with Hive w/Tez as an execution engine with Single or small file tables. I can attach further logs if someone needs them for deeper analysis.
HDFS Output:
hadoop fs -ls /example_dw/crc/arsn Found 2 items -rwxr-x--- 6 loaduser hadoopusers 0 2015-05-17 20:03 /example_dw/crc/arsn/_SUCCESS -rwxr-x--- 6 loaduser hadoopusers 3883880 2015-05-17 20:03 /example_dw/crc/arsn/part-m-00000
Hive Table Describe:
hive> describe formatted crc_arsn;
OK
# col_name data_type comment
arsn_cd string
clmlvl_cd string
arclss_cd string
arclssg_cd string
arsn_prcsr_rmk_ind string
arsn_mbr_rspns_ind string
savtyp_cd string
arsn_eff_dt string
arsn_exp_dt string
arsn_pstd_dts string
arsn_lstupd_dts string
arsn_updrsn_txt string
appl_user_id string
arsntyp_cd string
pre_d_indicator string
arsn_display_txt string
arstat_cd string
arsn_tracking_no string
arsn_cstspcfc_ind string
arsn_mstr_rcrd_ind string
state_specific_ind string
region_specific_in string
arsn_dpndnt_cd string
unit_adjustment_in string
arsn_mbr_only_ind string
arsn_qrmb_ind string
# Detailed Table Information
Database: adw
Owner: LOADUSER@EXA.EXAMPLE.COM
CreateTime: Mon Apr 28 13:28:05 EDT 2014
LastAccessTime: UNKNOWN
Protect Mode: None
Retention: 0
Location: hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn
Table Type: EXTERNAL_TABLE
Table Parameters:
EXTERNAL TRUE
transient_lastDdlTime 1398706085
# Storage Information
SerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: []
Sort Columns: []
Storage Desc Params:
field.delim \t
line.delim \n
serialization.format \t
Time taken: 1.245 seconds, Fetched: 54 row(s)
Explain Hive 1.2.0 w/Tez:
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 depends on stages: Stage-1
STAGE PLANS:
Stage: Stage-1
Tez
Edges:
Reducer 2 <- Map 1 (SIMPLE_EDGE)
Reducer 3 <- Reducer 2 (SIMPLE_EDGE)
Explain Hive 0.13 w/Tez:
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 is a root stage
STAGE PLANS:
Stage: Stage-1
Tez
Edges:
Reducer 2 <- Map 1 (SIMPLE_EDGE)
Reducer 3 <- Reducer 2 (SIMPLE_EDGE)
Results:
Hive 1.2.0 w/Spark 1.3.1: Finished successfully in 7.09 seconds Hive 1.2.0 w/Mapreduce: Stage 1: 32 Seconds Stage 2: 35 Seconds Hive 1.2.0 w/Tez 0.5.3: Time taken: 565.025 seconds, Fetched: 11516 row(s) Hive 0.13 w/Tez 0.4.0: Time taken: 13.552 seconds, Fetched: 11516 row(s)
And finally looking at the Dag Attempt that is stuck for 500 seconds or so in Tez it looks to be stuck running the same method over and over again:
8 duration=2561 from=org.apache.hadoop.hive.ql.exec.tez.RecordProcessor> 2015-05-18 19:58:41,719 INFO [TezChild] exec.Utilities: PLAN PATH = hdfs://xhadnnm1p.example.com:8020/tmp/hive/gss2002/dbc4b0b5-7859-4487-a56d-969440bc5e90/hive_2015-05-18_19-58-25_951_5497535752804149087-1/gss2002/_tez_scratch_dir/4e635121-c4cd-4e3f-b96b-9f08a6a7bf5d/map.xml 2015-05-18 19:58:41,822 INFO [TezChild] exec.MapOperator: MAP[4]: records read - 1 2015-05-18 19:58:41,835 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 2015-05-18 19:58:41,848 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 ...... 2015-05-18 20:07:46,560 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 2015-05-18 20:07:46,574 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 2015-05-18 20:07:46,587 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 2015-05-18 20:07:46,603 INFO [TezChild] io.HiveContextAwareRecordReader: Processing file hdfs://xhadnnm1p.example.com:8020/example_dw/crc/arsn/part-m-00000 2015-05-18 20:07:46,603 INFO [TezChild] log.PerfLogger: </PERFLOG method=TezRunProcessor start=1431993518764 end=1431994066603 duration=547839 from=org.apache.hadoop.hive.ql.exec.tez.TezProcessor> 2015-05-18 20:07:46,603 INFO [TezChild] exec.MapOperator: 4 finished. closing... 2015-05-18 20:07:46,603 INFO [TezChild] exec.MapOperator: RECORDS_IN_Map_1:13440