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From "Lefty Leverenz (JIRA)" <>
Subject [jira] [Commented] (HIVE-17458) VectorizedOrcAcidRowBatchReader doesn't handle 'original' files
Date Sun, 05 Nov 2017 03:16:01 GMT


Lefty Leverenz commented on HIVE-17458:

No doc needed:  This changes the description of ** but it doesn't
need to be documented because it's for internal use only.  (See HIVE-14035 comments, 21-22
Aug. 2016.)

> VectorizedOrcAcidRowBatchReader doesn't handle 'original' files
> ---------------------------------------------------------------
>                 Key: HIVE-17458
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>    Affects Versions: 2.2.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Critical
>             Fix For: 3.0.0
>         Attachments: HIVE-17458.01.patch, HIVE-17458.02.patch, HIVE-17458.03.patch, HIVE-17458.04.patch,
HIVE-17458.05.patch, HIVE-17458.06.patch, HIVE-17458.07.patch, HIVE-17458.07.patch, HIVE-17458.08.patch,
HIVE-17458.09.patch, HIVE-17458.10.patch, HIVE-17458.11.patch, HIVE-17458.12.patch, HIVE-17458.12.patch,
HIVE-17458.13.patch, HIVE-17458.14.patch, HIVE-17458.15.patch, HIVE-17458.16.patch
> VectorizedOrcAcidRowBatchReader will not be used for original files.  This will likely
look like a perf regression when converting a table from non-acid to acid until it runs through
a major compaction.
> With Load Data support, if large files are added via Load Data, the read ops will not
vectorize until major compaction.  
> There is no reason why this should be the case.  Just like OrcRawRecordMerger, VectorizedOrcAcidRowBatchReader
can look at the other files in the logical tranche/bucket and calculate the offset for the
RowBatch of the split.  (Presumably getRecordReader().getRowNumber() works the same in vector
> In this case we don't even need OrcSplit.isOriginal() - the reader can infer it from
file path... which in particular simplifies OrcInputFormat.determineSplitStrategies()

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