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From "Hive QA (JIRA)" <>
Subject [jira] [Commented] (HIVE-7805) Support running multiple scans in hbase-handler
Date Sun, 26 Apr 2015 00:45:39 GMT


Hive QA commented on HIVE-7805:

{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:

{color:red}ERROR:{color} -1 due to 18 failed/errored test(s), 8815 tests executed
*Failed tests:*
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
TestMinimrCliDriver-list_bucket_dml_10.q-bucket_num_reducers.q-bucket6.q-and-1-more - did
not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
- did not produce a TEST-*.xml file
TestMinimrCliDriver-ql_rewrite_gbtoidx.q-smb_mapjoin_8.q - did not produce a TEST-*.xml file
TestMinimrCliDriver-schemeAuthority2.q-bucket4.q-input16_cc.q-and-1-more - did not produce
a TEST-*.xml file

Test results:
Console output:
Test logs:

Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 18 tests failed

This message is automatically generated.

ATTACHMENT ID: 12728180 - PreCommit-HIVE-TRUNK-Build

> Support running multiple scans in hbase-handler
> -----------------------------------------------
>                 Key: HIVE-7805
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: HBase Handler
>    Affects Versions: 0.14.0
>            Reporter: Andrew Mains
>            Assignee: Andrew Mains
>         Attachments: HIVE-7805.1.patch, HIVE-7805.2.patch, HIVE-7805.patch
> Currently, the HiveHBaseTableInputFormat only supports running a single scan. This can
be less efficient than running multiple disjoint scans in certain cases, particularly when
using a composite row key. For instance, given a row key schema of:
> {code}
> struct<bucket int, time timestamp>
> {code}
> if one wants to push down the predicate:
> {code}
> bucket IN (1, 10, 100) AND timestamp >= 1408333927 AND timestamp < 1408506670
> {code}
> it's much more efficient to run a scan for each bucket over the time range (particularly
if there's a large amount of data per day). With a single scan, the MR job has to process
the data for all time for buckets in between 1 and 100.
> hive should allow HBaseKeyFactory's to decompose a predicate into one or more scans in
order to take advantage of this fact.

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