KYLIN-3727 Check if where is no directories, then finish job successf…

[Sidonet]

…ully.

Input path for HBase load consists
_SUCCESS
F1
F2
etc...

So, check if no folders exist, then skip loading step.

Test for non-empty cube:
2019-02-28 14:56:20,333 INFO [Scheduler 136668115 Job 0143a095-92fe-c8e0-a919-428682e2f15d-238] execution.ExecutableManager:453 : job id:0143a095-92fe-c8e0-a919-428682e2f15d-08 from READY to RUNNING
2019-02-28 14:56:20,354 INFO [Scheduler 136668115 Job 0143a095-92fe-c8e0-a919-428682e2f15d-238] common.HadoopShellExecutable:59 : parameters of the HadoopShellExecutable: -input hdfs://***:8020/kylin/kylin_metadata/kylin-0143a095-92fe-c8e0-a919-428682e2f15d/ORCTESTCUBE/hfile -htablename KYLIN_D9OV6ZF44W -cubename ORCTESTCUBE
2019-02-28 14:56:25,416 DEBUG [Scheduler 136668115 Job 0143a095-92fe-c8e0-a919-428682e2f15d-238] steps.BulkLoadJob:95 : Start to run LoadIncrementalHFiles

Test in my env for empty cube:
2019-02-28 14:42:15,699 INFO [Scheduler 136668115 Job 199180ac-8ab3-708f-c89c-6f2166a7d27d-102] execution.ExecutableManager:453 : job id:199180ac-8ab3-708f-c89c-6f2166a7d27d-08 from READY to RUNNING
2019-02-28 14:42:15,784 INFO [Scheduler 136668115 Job 199180ac-8ab3-708f-c89c-6f2166a7d27d-102] common.HadoopShellExecutable:59 : parameters of the HadoopShellExecutable: -input hdfs://***:8020/kylin/kylin_metadata/kylin-199180ac-8ab3-708f-c89c-6f2166a7d27d/kylin_sales_cube_orc/hfile -htablename KYLIN_MP2UWUVS0X -cubename kylin_sales_cube_orc
2019-02-28 14:42:21,402 DEBUG [Scheduler 136668115 Job 199180ac-8ab3-708f-c89c-6f2166a7d27d-102] steps.BulkLoadJob:100 : Nothing to load, cube is empty

[asfgit]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@e5c7c0d). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #494   +/-   ##
=========================================
  Coverage          ?   24.47%           
  Complexity        ?     4963           
=========================================
  Files             ?     1144           
  Lines             ?    69444           
  Branches          ?     9902           
=========================================
  Hits              ?    16994           
  Misses            ?    50731           
  Partials          ?     1719

Impacted Files	Coverage Δ	Complexity Δ
.../apache/kylin/storage/hbase/steps/BulkLoadJob.java	0% <0%> (ø)	0 <0> (?)

---

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[shaofengshi]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 4184

• 0 of 16 (0.0%) changed or added relevant lines in 1 file are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.008%) to 26.953%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
storage-hbase/src/main/java/org/apache/kylin/storage/hbase/steps/BulkLoadJob.java	0	16	0.0%

Files with Coverage Reduction	New Missed Lines	%
core-dictionary/src/main/java/org/apache/kylin/dict/lookup/cache/RocksDBLookupTable.java	1	81.08%
server-base/src/main/java/org/apache/kylin/rest/util/QueryRequestLimits.java	1	47.62%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	5	77.81%

Totals
Change from base Build 4170:	-0.008%
Covered Lines:	18717
Relevant Lines:	69444

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💛 - Coveralls