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storage: expose separate WriteBatch interface #98712

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merged 1 commit into from
Mar 21, 2023

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jbowens
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@jbowens jbowens commented Mar 15, 2023

Adapt NewUnindexedBatch to no longer take a writeOnly parameter. Instead, a new NewWriteBatch method is exposed that returns a WriteBatch type that does not provide Reader facilities. Future work may remove UnindexedBatch altogether, updating callers to explicitly maintain separate Readers and WriteBatches.

Epic: None
Release note: None

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@jbowens jbowens force-pushed the writebatch branch 2 times, most recently from d820c87 to ad639da Compare March 15, 2023 22:18
@jbowens jbowens marked this pull request as ready for review March 15, 2023 22:29
@jbowens jbowens requested a review from a team as a code owner March 15, 2023 22:29
@jbowens jbowens requested a review from a team March 15, 2023 22:29
@jbowens jbowens requested a review from a team as a code owner March 15, 2023 22:29
@jbowens jbowens requested review from itsbilal and sumeerbhola March 15, 2023 22:29
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@sumeerbhola sumeerbhola left a comment

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:lgtm:

Reviewed 15 of 15 files at r1, all commit messages.
Reviewable status: :shipit: complete! 1 of 0 LGTMs obtained (waiting on @itsbilal and @jbowens)


pkg/storage/engine.go line 977 at r1 (raw file):

	// iterator has to be repositioned using a seek operation, after the
	// mutations were done.
	ReadWriter

can this be changed to Reader?


pkg/storage/batch_test.go line 694 at r1 (raw file):

	defer e.Close()

	batch := e.NewUnindexedBatch(true /* writeOnly */)

Since someone can successfully turn a WriteBatch into a Reader since both are backed by the pebbleBatch implementation, should we keep this.

Adapt NewUnindexedBatch to no longer take a writeOnly parameter. Instead, a new
NewWriteBatch method is exposed that returns a WriteBatch type that does not
provide Reader facilities. Future work may remove UnindexedBatch altogether,
updating callers to explicitly maintain separate Readers and WriteBatches.

Epic: None
Release note: None
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Reviewable status: :shipit: complete! 1 of 0 LGTMs obtained (waiting on @itsbilal and @sumeerbhola)


pkg/storage/engine.go line 977 at r1 (raw file):

Previously, sumeerbhola wrote…

can this be changed to Reader?

Done.


pkg/storage/batch_test.go line 694 at r1 (raw file):

Previously, sumeerbhola wrote…

Since someone can successfully turn a WriteBatch into a Reader since both are backed by the pebbleBatch implementation, should we keep this.

Done.

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jbowens commented Mar 21, 2023

TFTR!

bors r=sumeerbhola

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craig bot commented Mar 21, 2023

Build succeeded:

@craig craig bot merged commit 18e6641 into cockroachdb:master Mar 21, 2023
@jbowens jbowens deleted the writebatch branch March 21, 2023 19:44
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3 participants