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This is an implementation of a Neethu design (design is included in the PR).

Add restore validation feature with simplified backup gap fix

Implements restore validation using audit_storage to verify backup/restore
correctness. Includes a minimal fix for the backup gap bug.

Key components:
- ValidateRestore audit type: compares source keys against restored keys
  at \xff\x02/rlog/ prefix in storage server
- DD audit fixes: propagate validation errors, handle DD failover correctly
- RestoreValidation and BackupAndRestoreValidation workloads for testing
- Simplified backup gap fix: prevent snapshot from finishing in the same
  iteration it dispatches the last tasks (single flag + one check)

Backup gap bug fix (FileBackupAgent.actor.cpp):
The original dispatcher marks ranges as DONE when selecting them for dispatch,
then immediately checks if all ranges are done. This causes snapshots to finish
before the dispatched tasks complete, creating gaps in backup coverage.

The fix adds a dispatchedInThisIteration flag. If tasks were dispatched in
this iteration, the completion check is skipped, ensuring at least one full
loop between dispatch and completion. This minimal change prevents premature
snapshot completion without complex state tracking.

Here is running the new simulation included here 100k times:

20251121-184138-stack-1458b890ad727389 compressed=True data_size=55635346 duration=3717292 ended=100000 fail_fast=10 max_runs=100000 pass=100000 priority=100 remaining=0 runtime=0:44:53 sanity=False started=100000 stopped=20251121-192631 submitted=20251121-184138 timeout=5400 username=stack

I ran all tests 100k times and looks like hangs on the end at 99975 or so. Looking to see if related.

Also verified the feature manually.

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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 2526933
  • Duration 0:23:53
  • Result: ❌ FAILED
  • Error: Error while executing command: ninja -v -C build_output -j ${NPROC} all. Reason: exit status 1
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Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

  • Commit ID: 2526933
  • Duration 0:29:44
  • Result: ❌ FAILED
  • Error: Error while executing command: ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ${HOME}/.ssh_key ec2-user@${MAC_EC2_HOST} /opt/homebrew/bin/bash --login -c ./build_pr_macos.sh. Reason: exit status 1
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 2526933
  • Duration 0:45:15
  • Result: ✅ SUCCEEDED
  • Error: N/A
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Result of foundationdb-pr-macos on macOS Ventura 13.x

  • Commit ID: 2526933
  • Duration 0:45:54
  • Result: ❌ FAILED
  • Error: Error while executing command: ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ${HOME}/.ssh_key ec2-user@${MAC_EC2_HOST} /usr/local/bin/bash --login -c ./build_pr_macos.sh. Reason: exit status 1
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 5c53ce8
  • Duration 0:04:04
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 5c53ce8
  • Duration 0:04:22
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 5c53ce8
  • Duration 0:04:23
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr on Linux RHEL 9

  • Commit ID: 5c53ce8
  • Duration 0:04:23
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 5c53ce8
  • Duration 0:04:29
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 2526933
  • Duration 1:16:37
  • Result: ✅ SUCCEEDED
  • Error: N/A
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 761b593
  • Duration 0:27:25
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  • Error: N/A
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 761b593
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 2526933
  • Duration 2:10:08
  • Result: ❌ FAILED
  • Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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Result of foundationdb-pr on Linux RHEL 9

  • Commit ID: 2526933
  • Duration 2:17:20
  • Result: ❌ FAILED
  • Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 761b593
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 761b593
  • Duration 2:14:02
  • Result: ❌ FAILED
  • Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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Result of foundationdb-pr on Linux RHEL 9

  • Commit ID: 761b593
  • Duration 2:26:47
  • Result: ❌ FAILED
  • Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: dcca4b7
  • Duration 0:24:30
  • Result: ✅ SUCCEEDED
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Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

  • Commit ID: dcca4b7
  • Duration 0:35:52
  • Result: ✅ SUCCEEDED
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: dcca4b7
  • Duration 0:45:37
  • Result: ✅ SUCCEEDED
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Result of foundationdb-pr-macos on macOS Ventura 13.x

  • Commit ID: dcca4b7
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: dcca4b7
  • Duration 1:09:12
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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: dcca4b7
  • Duration 1:14:15
  • Result: ✅ SUCCEEDED
  • Error: N/A
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Result of foundationdb-pr on Linux RHEL 9

  • Commit ID: dcca4b7
  • Duration 2:18:06
  • Result: ❌ FAILED
  • Error: Error while executing command: if python3 -m joshua.joshua list --stopped | grep ${ENSEMBLE_ID} | grep -q 'pass=10[0-9][0-9][0-9]'; then echo PASS; else echo FAIL && exit 1; fi. Reason: exit status 1
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@saintstack saintstack force-pushed the restore-validation-simple branch from dcca4b7 to 77618b6 Compare November 23, 2025 06:12
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 77618b6
  • Duration 0:04:25
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 77618b6
  • Duration 0:04:27
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 77618b6
  • Duration 0:04:25
  • Result: ❌ FAILED
  • Error: Error while executing command: if [[ $(git diff --shortstat 2> /dev/null | tail -n1) == "" ]]; then echo "CODE FORMAT CLEAN"; else echo "CODE FORMAT NOT CLEAN"; echo; echo "THE FOLLOWING FILES NEED TO BE FORMATTED"; echo; git ls-files -m; echo; if [[ $FDB_VERSION =~ 7\.\3. ]]; then echo skip; else exit 1; fi; fi. Reason: exit status 1
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@saintstack saintstack force-pushed the restore-validation-simple branch from cafb643 to ac07a89 Compare December 16, 2025 22:18
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

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Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

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Result of foundationdb-pr-clang-arm on Linux CentOS 7

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Result of foundationdb-pr-macos on macOS Ventura 13.x

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Result of foundationdb-pr-clang-arm on Linux CentOS 7

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Result of foundationdb-pr-clang on Linux RHEL 9

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Result of foundationdb-pr on Linux RHEL 9

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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

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} else {
// Extra key in restored data (skip it, as per design doc: one-directional comparison)
// Log the extra key for visibility without failing the validation
TraceEvent(SevInfo, "SSAuditRestoreExtraKey", thisServerID)
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Let's add it ass 'TraceEvent(SevInfo, "SSAuditRestoreExtraKey", just to be in-sync with other failures.
Let also push it in errors.push_back(error);
We want the user to know that there are some keys and it's not valid data. Lets treat this error as other errors found.

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No problem. Done.

}

// Check for any remaining source keys that are missing from restored data
if (errors.empty() && sourceIdx < sourceReply.data.size() && !sourceReply.more) {
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Why this !sourceReply.more ?

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We are checking end of the src and dest... Want to see if one side has more than the other and error if so (But above should be better.... I added && !restoredReply.more and only then error)

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I did no understand, why it it not an error if we have sourceReply.more is true ? Is it still be an error?

 * If extra key in restored data, report as error rather than as info.
 * Tighten up check on end where one side -- src or dest -- might have
   more data... if so, error.
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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 2b740ad
  • Duration 0:28:40
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 2b740ad
  • Duration 0:45:34
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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 2b740ad
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Result of foundationdb-pr on Linux RHEL 9

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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 2b740ad
  • Duration 2:03:12
  • Result: ✅ SUCCEEDED
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// Extra key in restored data
std::string error =
format("Extra key in restored data: %s", Traceable<StringRef>::toString(restoredKV.key).c_str());
TraceEvent(SevError, "SSAuditRestoreExtraKey", thisServerID)
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Is it intentional to use SSAuditRestoreExtraKey instead of SSAuditRestoreError

// Check for any remaining restored keys that don't have matching source keys
if (errors.empty() && restoredIdx < restoredReply.data.size() && !restoredReply.more) {
// Log the extra keys found in restored data
TraceEvent(SevInfo, "SSAuditRestoreExtraRestoredKeys", thisServerID)
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Shall we change this also to SevError and push them into errors?
SSAuditRestoreExtraRestoredKeys->SSAuditRestoreError

tr.setVersion(version);
tr.setOption(FDBTransactionOptions::ACCESS_SYSTEM_KEYS);
tr.setOption(FDBTransactionOptions::LOCK_AWARE);
state RangeResult restoredData = wait(tr.getRange(restoredRange, limit, Snapshot::False, Reverse::False));
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In the scenario of limitBytes for reply reaches, does the getRange(restoreRange) will give less keys than getRange(rangeToRead) because of bigger key size in restoreRange?

If yes, how is it handled in the code?

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Result of foundationdb-pr-clang-ide on Linux RHEL 9

  • Commit ID: 3872f35
  • Duration 0:22:31
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Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

  • Commit ID: 3872f35
  • Duration 0:34:14
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 3872f35
  • Duration 0:43:41
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Result of foundationdb-pr-macos on macOS Ventura 13.x

  • Commit ID: 3872f35
  • Duration 0:48:48
  • Result: ✅ SUCCEEDED
  • Error: N/A
  • Build Log terminal output (available for 30 days)
  • Build Workspace zip file of the working directory (available for 30 days)

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Result of foundationdb-pr on Linux RHEL 9

  • Commit ID: 3872f35
  • Duration 1:01:55
  • Result: ✅ SUCCEEDED
  • Error: N/A
  • Build Log terminal output (available for 30 days)
  • Build Workspace zip file of the working directory (available for 30 days)

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Result of foundationdb-pr-clang on Linux RHEL 9

  • Commit ID: 3872f35
  • Duration 1:03:32
  • Result: ✅ SUCCEEDED
  • Error: N/A
  • Build Log terminal output (available for 30 days)
  • Build Workspace zip file of the working directory (available for 30 days)

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Result of foundationdb-pr-cluster-tests on Linux RHEL 9

  • Commit ID: 3872f35
  • Duration 2:00:39
  • Result: ✅ SUCCEEDED
  • Error: N/A
  • Build Log terminal output (available for 30 days)
  • Build Workspace zip file of the working directory (available for 30 days)
  • Cluster Test Logs zip file of the test logs (available for 30 days)

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3 participants