Design principles to make it simple and avoid error-prone:

Bulk loading is managed based on KeyRange. The bulk loading UI must guarantee that a bulk loading task is running on at most one KeyRange, and a KeyRange can have at most one bulk loading task at a time.
Users can never overwrite a key range that is running a bulk loading task, unless the user has manually cancelled it.
Even for a key range which bulk loading task has been completed, users cannot start a new task overlapping the range unless users have explicitly removed the old task on the range.
When users input a range to remove or cancel bulk loading tasks, the system must cancel all tasks intersecting the input range.
Each transaction issued by users can only include one of the three types of the operation: new task, check status, cancel task.

User interface: Say, tr is a readwrite transaction. Each transaction can only include one of the three following types of operation:

New task: tr->set("\xff\xff/bulk_loading/task/", bulkLoadStateValue(range, path)); wait(tr->commit()); Succeed if no existing bulk loading task (in metadata) intersecting the input task range; Otherwise, throwing an error.
Check status: wait(tr->getRange("\xff\xff/bulk_loading/status/a", "\xff\xff/bulk_loading/status/b")); Return all tasks's status intersecting the input range.
Cancel task: tr->clear("\xff\xff/bulk_loading/cancel/a", "\xff\xff/bulk_loading/cancel/b"); wait(tr->commit()); Cancel all tasks intersecting the input range.

Those operations to the special key space are mapped to read/write operation on "\xff/bulkLoad/" system key space, which in turn to control the actual bulk loading in FDB internal.

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)

Apr 26 '24 22:04 kakaiu

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:03:53
Result: :x: 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; exit 1; fi. Reason: exit status 1
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Apr 26 '24 22:04 foundationdb-ci

Result of foundationdb-pr-clang on Linux CentOS 7

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:03:54
Result: :x: 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; exit 1; fi. Reason: exit status 1
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Apr 26 '24 22:04 foundationdb-ci

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

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:03:56
Result: :x: 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; exit 1; fi. Reason: exit status 1
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Apr 26 '24 22:04 foundationdb-ci

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:04:03
Result: :x: 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; exit 1; fi. Reason: exit status 1
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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)

Apr 26 '24 22:04 foundationdb-ci

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

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:10:37
Result: :x: FAILED
Error: reference not found for primary source and source version 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Build Log terminal output (available for 30 days)
Build Workspace zip file of the working directory (available for 30 days)

Apr 26 '24 22:04 foundationdb-ci

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

Commit ID: 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
Duration 0:10:53
Result: :x: FAILED
Error: reference not found for primary source and source version 192b0b19d7031687fb7a3f65c0e86919cccd5b7d
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Build Workspace zip file of the working directory (available for 30 days)

Apr 26 '24 22:04 foundationdb-ci

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

Commit ID: 4831a3832bf2f93a6f454a2619c5e1d9ebf9d131
Duration 0:24:58
Result: :white_check_mark: SUCCEEDED
Error: N/A
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Apr 26 '24 22:04 foundationdb-ci

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

Commit ID: 42f624be026e8a25f94e4efa969e47506e24ae0d
Duration 0:24:48
Result: :white_check_mark: SUCCEEDED
Error: N/A
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Apr 26 '24 22:04 foundationdb-ci

Result of foundationdb-pr-clang on Linux CentOS 7

Commit ID: 4831a3832bf2f93a6f454a2619c5e1d9ebf9d131
Duration 0:29:46
Result: :x: FAILED
Error: Error while executing command: python3 -m joshua.joshua start --tarball $(find build_output/packages -name correctness\*.tar.gz) --username ${CORRECTNESS_USERNAME} --max-runs 10000. Reason: exit status 2
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Apr 26 '24 23:04 foundationdb-ci

Result of foundationdb-pr-clang on Linux CentOS 7

Commit ID: 42f624be026e8a25f94e4efa969e47506e24ae0d
Duration 0:31:03
Result: :x: FAILED
Error: Error while executing command: python3 -m joshua.joshua start --tarball $(find build_output/packages -name correctness\*.tar.gz) --username ${CORRECTNESS_USERNAME} --max-runs 10000. Reason: exit status 2
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Build Workspace zip file of the working directory (available for 30 days)

Apr 26 '24 23:04 foundationdb-ci

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 4831a3832bf2f93a6f454a2619c5e1d9ebf9d131
Duration 0:36:47
Result: :x: FAILED
Error: Error while executing command: mvn install:install-file --batch-mode -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -Dfile=packages/fdb-java-${FDB_VERSION}-SNAPSHOT.jar -DgroupId=org.foundationdb -DartifactId=fdb-java -Dversion=${FDB_VERSION}-SNAPSHOT -Dpackaging=jar -DgeneratePom=true. Reason: exit status 1
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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)

Apr 26 '24 23:04 foundationdb-ci

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 4831a3832bf2f93a6f454a2619c5e1d9ebf9d131
Duration 0:39:22
Result: :x: FAILED
Error: Error while executing command: python3 -m joshua.joshua start --tarball $(find build_output/packages -name correctness\*.tar.gz) --username ${CORRECTNESS_USERNAME} --max-runs 10000. Reason: exit status 2
Build Log terminal output (available for 30 days)
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Apr 26 '24 23:04 foundationdb-ci

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

Commit ID: 42f624be026e8a25f94e4efa969e47506e24ae0d
Duration 0:36:49
Result: :x: FAILED
Error: Error while executing command: mvn install:install-file --batch-mode -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -Dfile=packages/fdb-java-${FDB_VERSION}-SNAPSHOT.jar -DgroupId=org.foundationdb -DartifactId=fdb-java -Dversion=${FDB_VERSION}-SNAPSHOT -Dpackaging=jar -DgeneratePom=true. Reason: exit status 1
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)

Apr 26 '24 23:04 foundationdb-ci

Result of foundationdb-pr on Linux CentOS 7

Commit ID: 42f624be026e8a25f94e4efa969e47506e24ae0d
Duration 0:38:16
Result: :x: FAILED
Error: Error while executing command: python3 -m joshua.joshua start --tarball $(find build_output/packages -name correctness\*.tar.gz) --username ${CORRECTNESS_USERNAME} --max-runs 10000. Reason: exit status 2
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Apr 26 '24 23:04 foundationdb-ci