docs(spanner): snippet for setting read lock mode #2495
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Snippet shows how to set the read lock mode at the client-level and how to override the option at the transaction-level.
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Summary of ChangesHello @skuruppu, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the Google Cloud Spanner documentation by adding a new sample that demonstrates the usage of read lock modes within read-write transactions. The sample illustrates how to apply an optimistic read lock mode globally at the client level and then specifically override it with a pessimistic read lock mode for individual transactions, providing clear guidance on managing transaction concurrency. Highlights
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Code Review
This pull request introduces a new code snippet for setting the read lock mode in Spanner, along with corresponding documentation and tests. The implementation is mostly correct, but I've identified a critical issue in how the client-level options are configured in the new sample, which would prevent it from working as intended. Additionally, I've pointed out a couple of medium-severity issues related to redundant code and documentation formatting. My suggestions aim to correct these issues and improve the overall quality of the sample.
| const readLockModeOptionsForClient = { | ||
| defaultTransactionOptions: { | ||
| readLockMode: | ||
| protos.google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode | ||
| .OPTIMISTIC, | ||
| }, | ||
| }; | ||
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| // Instantiates a client with defaultTransactionOptions | ||
| const spanner = new Spanner({ | ||
| projectId: projectId, | ||
| defaultTransactionOptions: readLockModeOptionsForClient, | ||
| }); |
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The defaultTransactionOptions object is nested incorrectly. It should be a flat object at the top level of the Spanner constructor options, not nested within another defaultTransactionOptions property. This prevents the client-level readLockMode from being applied.
const defaultTransactionOptions = {
readLockMode:
protos.google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode
.OPTIMISTIC,
};
// Instantiates a client with defaultTransactionOptions
const spanner = new Spanner({
projectId: projectId,
defaultTransactionOptions,
});| } catch (err) { | ||
| console.error('ERROR:', err); | ||
| } finally { | ||
| transaction.end(); |
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The database.runTransaction() method automatically handles session management, including releasing the session when the transaction is complete. Calling transaction.end() here is redundant and should be removed for clarity and to avoid potential issues with double-releasing sessions.
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| `node read-lock-mode.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>` | ||
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There are some extra newlines here that make the formatting inconsistent with the rest of the file. Please remove the extra blank lines for consistency.
| `node read-lock-mode.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>` | |
| ----- | |
| `node read-lock-mode.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>` | |
| ----- | |
1 participant
Snippet shows how to set the read lock mode at the client-level and how to override the option at the transaction-level.