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Extensions to log server disk queue (made in the context of version vector/unicast) #11777

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@sbodagala sbodagala commented Nov 13, 2024 •
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Goal:

The goal is to hold (version incompatible) disk queue related changes, made in the context of getting recovery to work with version vector, in a branch ("version-vector-disk-queue").

Changes:

Commit 37485d2:

  • Extend the disk queue entry data structure to hold the following information, needed by the recovery algorithm when unicast is enabled:
  • PrevVersion of a version
  • List of log servers that a commit proxy sends a commit version to

And, extend the code to populate "unknownCommittedVersions" list (the list of commit versions whose commit status is not known, and to be determined by the recovery version computation algorithm) on a log server restart.

Commit 0b7fbae:

Extend the log server restart logic to read versions from disk queue from known committed version onwards (instead of from the latest known persistent data durable version). The unicast recovery algorithm needs to know all commit versions, from known committed version onwards, that have been received by a log server in order to correctly compute the recovery version.

Commit c6f99e2:

Do not let a log server delete any versions from known committed version onwards from its disk queue.

Commit dfb2d97:

Make log servers preserve the disk queue positions of all versions from known committed version onwards (when version vector is enabled).

Commit 9249ca1:

This change is related to the change made in PR #11815 in "main".

In case of spill by reference, log servers should use the logic that is based over "TagData::popped" to decide how long to keep the disk queue positions of versions in memory (instead of using the logic that is based over "LogData::persistentDataVersion", which is applicable to spill by value case).

Commit 5837fd1:

Consider all LogData structures while deciding where to start reading the disk queue
from on log server restart.

Commit 16b3aa9:

The known committed version of a LogData structure could be greater than the LogData's version in certain cases (on re-start, because the known committed version could get set based on "revert"). So drop the assertion related to this case.

NOTE: Please note that these changes will cause version incompatibility and so additional code/logic will need to be added to make sure that upgrades/restart related simulation tests work properly.

Code-Reviewer Section

The general pull request guidelines can be found here.

Please check each of the following things and check all boxes before accepting a PR.

  • The PR has a description, explaining both the problem and the solution.
  • The description mentions which forms of testing were done and the testing seems reasonable.
  • Every function/class/actor that was touched is reasonably well documented.

For Release-Branches

If this PR is made against a release-branch, please also check the following:

  • This change/bugfix is a cherry-pick from the next younger branch (younger release-branch or main if this is the youngest branch)
  • There is a good reason why this PR needs to go into a release branch and this reason is documented (either in the description above or in a linked GitHub issue)

@sbodagala
- Extend the disk queue entry data structure to hold the following
37485d2 
information, needed by the recovery algorithm when unicast is enabled:
- PrevVersion of a version
- List of log servers that a commit proxy sends a commit version to

And, extend the code to populate "unknownCommittedVersions" list (the
list of commit versions whose commit status is not known, and to be
determined by the recovery version computation algorithm) on a log
server restart.

NOTE: Please note that these changes will cause version incompatibility
and so additional code/logic will need to be added to make sure that
upgrades/restart related simulation tests work properly.
@sbodagala
- On restart, make log servers read disk queue entries from known
0b7fbae 
committed version onwards in the case where the known committed version
is behind LogData::persistentDataDurableVersion (and version vector
unicast is enabled). This is so we will populate "LogData::unknownCommittedVersions",
on log server restart, with all versions that are needed by unicast recovery.
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  • Commit ID: 37485d2
  • Duration 0:35:14
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  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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jzhou77
jzhou77 reviewed Dec 2, 2024
View reviewed changes
fdbserver/TLogServer.actor.cpp Outdated
Comment on lines 3476 to 3481
logData->unknownCommittedVersions.emplace_front(qe.version, qe.prevVersion, qe.tLogLocIds);

while (!logData->unknownCommittedVersions.empty() &&
logData->unknownCommittedVersions.back().version <= logData->knownCommittedVersion) {
logData->unknownCommittedVersions.pop_back();
}
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Can you make a function for these lines for code reuse?
There are similar code below and in tLogCommit().

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Good point. Done now.

@sbodagala
If version vector is enabled then preserve all versions from "knownCo…
c6f99e2 
…mmittedVersion"

onwards in log server's disk queue.
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@sbodagala
- Make log servers preserve the disk queue positions of all versions
dfb2d97 
from known committed version onwards, when version vector is enabled.
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@sbodagala sbodagala force-pushed the disk_queue_related_changes branch from 150fed7 to 9249ca1 Compare March 11, 2025 20:58
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  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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  • Duration 0:47:06
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  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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@sbodagala
- Figure out the correct position to start reading the disk queue
5837fd1 
from, on log server restart, when unicast is enabled.
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  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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  • Commit ID: 5837fd1
  • Duration 0:45:48
  • Result: ❌ FAILED
  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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  • Duration 0:57:37
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@sbodagala
- The known committed version of a LogData structure could be greater
16b3aa9 
than the LogData's version in certain cases (on re-start, because the
known committed version could get set based on "recoverAt"). So drop
the assertion related to this.
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Result of foundationdb-pr-clang-arm on Linux CentOS 7

  • Commit ID: 16b3aa9
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  • Error: Error while executing command: cmake -S . -B build_output -D USE_CCACHE=ON -D USE_WERROR=ON -D RUN_JUNIT_TESTS=ON -D RUN_JAVA_INTEGRATION_TESTS=ON -D BUILD_DOCUMENTATION=ON -D BUILD_AWS_BACKUP=OFF -G Ninja. Reason: exit status 1
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Result of foundationdb-pr-clang on Linux CentOS 7

  • Commit ID: 16b3aa9
  • Duration 0:34:51
  • Result: ❌ FAILED
  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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Result of foundationdb-pr-macos-m1 on macOS Ventura 13.x

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Result of foundationdb-pr on Linux CentOS 7

  • Commit ID: 16b3aa9
  • Duration 0:44:41
  • Result: ❌ FAILED
  • Error: Error while executing command: ctest -j ${NPROC} --no-compress-output -T test --output-on-failure. Reason: exit status 8
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Result of foundationdb-pr-cluster-tests on Linux CentOS 7

  • Commit ID: 16b3aa9
  • Duration 0:55:50
  • 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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Result of foundationdb-pr-macos on macOS Ventura 13.x

  • Commit ID: 16b3aa9
  • Duration 0:57:05
  • 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)

dlambrig
dlambrig reviewed Apr 15, 2025
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fdbserver/TLogServer.actor.cpp
@@ -1186,7 +1268,9 @@ ACTOR Future<Void> updatePersistentData(TLogData* self, Reference<LogData> logDa
}
if (minVersion != std::numeric_limits<Version>::max()) {
self->persistentQueue->forgetBefore(
newPersistentDataVersion,
(!SERVER_KNOBS->ENABLE_VERSION_VECTOR_TLOG_UNICAST
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In main branch, the first parameter to forgotBefore on line 1189 is minVersion, not newPersistentDataVersion. minVersion is calculated above. Should minVersion be used here?

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@dlambrig dlambrig dlambrig approved these changes

@jzhou77 jzhou77 jzhou77 left review comments

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@sbodagala @foundationdb-ci @dlambrig @jzhou77