Cli: Inconsistent Behavior Between Debug Zip And Tsdump In Virtual Clusters

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Introduction

CockroachDB is a distributed relational database that provides a scalable and highly available solution for data storage and retrieval. However, like any complex system, it can exhibit inconsistent behavior in certain scenarios. In this article, we will explore an issue where the debug zip and debug tsdump commands exhibit inconsistent behavior in virtual cluster environments.

Environment

The issue was observed in a virtual cluster environment using the roachprod product and version v24.3. The exact version may vary, but the error reference suggests that it is related to the v24.3 release.

Description

When running in a virtual cluster environment, there is inconsistent behavior between the debug zip and debug tsdump commands. The debug zip command successfully captures data from a virtual cluster, while the debug tsdump command fails with errors indicating that it is unsupported in a virtual cluster environment.

Steps to Reproduce

To reproduce the issue, follow these steps:

  1. Set up a CockroachDB cluster using roachprod.
  2. Successfully run ./cockroach debug zip to capture debug information.
  3. Attempt to capture time-series data using the following command:
    ./cockroach debug tsdump --format=raw --from='2025-03-10' --insecure > tsdump.gob

Actual Behavior

When executing the debug tsdump command, the following errors are encountered:

On source node:

ERROR: unimplemented: operation is unsupported within a virtual cluster
SQLSTATE: 0A000
HINT: You have attempted to use a feature that is not yet implemented.
See: https://go.crdb.dev/issue-v/54252/v24.3
Failed running "debug tsdump"

On standby node:

ERROR: service unavailable for target tenant (alib)
SQLSTATE: 08000
HINT: Double check your "-ccluster=" connection option or your "cluster:" database name prefix.
Failed running "debug tsdump"

Expected Behavior

The expected behavior is that debug tsdump should work consistently with debug zip in a virtual cluster environment, or both should fail with similar error messages.

Additional Context

The second error suggests that the tsdump command needs to be run from the system tenant rather than the application tenant. The inconsistency appears to be that debug zip works by default while debug tsdump does not. This may be due to the fact that debug zip is designed to work with virtual clusters, while debug tsdump is not.

Possible Solution

To resolve this issue, the following solutions are possible:

  1. Make debug tsdump work from application tenants like debug zip does.
  2. Make both commands consistently require system tenant access with clear error messages.

Conclusion

In conclusion, the debug zip and debug tsdump commands exhibit inconsistent behavior in virtual cluster environments. The debug zip command works successfully, while the debug tsdump command fails with errors. To resolve this issue, either debug tsdump should be made to work from application tenants, or both commands should be made to consistently require system tenant access with clear error messages.

Recommendations

Based on the analysis, the following recommendations are made:

  • Update the debug tsdump command to work from application tenants.
  • Update the debug zip command to require system tenant access with clear error messages.
  • Provide clear documentation on the requirements for running debug tsdump in virtual cluster environments.

Jira Issue

Q: What is the issue with debug zip and tsdump in virtual clusters?

A: The issue is that debug zip and debug tsdump exhibit inconsistent behavior in virtual cluster environments. debug zip works successfully, while debug tsdump fails with errors.

Q: What are the symptoms of this issue?

A: The symptoms of this issue include:

  • debug zip successfully capturing data from a virtual cluster
  • debug tsdump failing with errors indicating that it is unsupported in a virtual cluster environment

Q: What are the error messages associated with this issue?

A: The error messages associated with this issue include:

  • ERROR: unimplemented: operation is unsupported within a virtual cluster
  • SQLSTATE: 0A000
  • HINT: You have attempted to use a feature that is not yet implemented.
  • See: https://go.crdb.dev/issue-v/54252/v24.3
  • Failed running "debug tsdump"

Q: What are the possible solutions to this issue?

A: The possible solutions to this issue include:

  • Making debug tsdump work from application tenants like debug zip does
  • Making both commands consistently require system tenant access with clear error messages

Q: How can I reproduce this issue?

A: To reproduce this issue, follow these steps:

  1. Set up a CockroachDB cluster using roachprod.
  2. Successfully run ./cockroach debug zip to capture debug information.
  3. Attempt to capture time-series data using the following command:
    ./cockroach debug tsdump --format=raw --from='2025-03-10' --insecure > tsdump.gob

Q: What is the expected behavior for debug tsdump in virtual clusters?

A: The expected behavior for debug tsdump in virtual clusters is that it should work consistently with debug zip or both should fail with similar error messages.

Q: What is the relationship between debug tsdump and virtual clusters?

A: The debug tsdump command is not designed to work with virtual clusters, which is why it fails with errors. The debug zip command, on the other hand, is designed to work with virtual clusters.

Q: How can I resolve this issue?

A: To resolve this issue, either debug tsdump should be made to work from application tenants, or both commands should be made to consistently require system tenant access with clear error messages.

Q: What is the Jira issue related to this problem?

A: The Jira issue related to this problem is CRDB-48537.

Q: What are the recommendations for resolving this issue?

A: The recommendations for resolving this issue include:

  • Updating the debug tsdump command to work from application tenants
  • Updating the debug zip command to require system tenant access with clear error messages
  • Providing clear documentation on the requirements for running debug tsdump in virtual cluster environments.