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*: fix bug when unsigned pk meets feedback ranges #10307

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merged 9 commits into from
Jun 4, 2019
Merged

*: fix bug when unsigned pk meets feedback ranges #10307

merged 9 commits into from
Jun 4, 2019

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winoros
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@winoros winoros commented Apr 29, 2019

What problem does this PR solve?

fix #10242

What is changed and how it works?

Port some codes from #7921

Check List

Tests

  • Unit test

Code changes

  • Has exported function/method change

Related changes

  • Need to be included in the release note

@winoros winoros added the type/bugfix This PR fixes a bug. label Apr 29, 2019
winoros
winoros commented Apr 29, 2019
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@winoros winoros requested a review from alivxxx April 29, 2019 11:51
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shenli commented Apr 30, 2019

Could you add some test cases?

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winoros commented Apr 30, 2019 •
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@eurekaka
We need to move it because of the following reasons.

  1. In TableRangesToKVRanges, we encode the ranger.Range to kv.KeyRange. Since we store unsigned pk as int pk in physical kv layer in fact, unsigned ones are stored before signed ones in fact.
  2. But the SplitRange will put the unsigned ones after signed ones since it stores logical value.
  3. And if the reader doesn't set KeepOrder true. We do give TableRangesToKVRanges a full range contain both unsigned part and signed part. Then we got a wrong Range slice after Histogram.SplitRange.

So if we need to call Histogram.SplitRange, we should call it earlier to avoid this bug.

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winoros commented Apr 30, 2019 •
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When adding tests, finding that though the response can be sent correctly, but the feedback cannot be updated correctly. Need more changes to correct it.
Master has the same problem, it can be replayed easily if we change the column type from tinyint to bigint in unit test TestUnsignedFeedbackRanges.
/cc @lamxTyler

eurekaka
eurekaka reviewed Apr 30, 2019
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executor/table_reader.go
@@ -96,6 +96,9 @@ func (e *TableReaderExecutor) Open(ctx context.Context) error {
}

e.resultHandler = &tableResultHandler{}
if e.feedback != nil && e.feedback.Hist() != nil {
e.ranges = e.feedback.Hist().SplitRange(e.ranges)
}
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Got it, please add the comment here to inform that SplitRange must be placed before splitRanges and explain the reasons.

@winoros winoros requested a review from eurekaka May 23, 2019 12:46
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winoros commented May 23, 2019

@lamxTyler @eurekaka Addressed, PTAL

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@winoros CI failed, PTAL

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winoros commented May 24, 2019

@eurekaka fixed

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winoros commented May 27, 2019

@lamxTyler Fixed

alivxxx
alivxxx reviewed May 27, 2019
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alivxxx
alivxxx reviewed May 27, 2019
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LGTM

zz-jason
zz-jason approved these changes May 28, 2019
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LGTM

@zz-jason zz-jason added the status/LGT2 Indicates that a PR has LGTM 2. label May 28, 2019
eurekaka
eurekaka approved these changes May 28, 2019
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LGTM

@zz-jason zz-jason merged commit 02526b6 into pingcap:release-2.1 Jun 4, 2019
@winoros winoros deleted the feedback-unsigned-ranges branch June 13, 2019 05:50
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@eurekaka eurekaka eurekaka approved these changes

@zz-jason zz-jason zz-jason approved these changes

@qw4990 qw4990 Awaiting requested review from qw4990

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@winoros @shenli @eurekaka @zz-jason @alivxxx @qw4990