Auxiliary directory for supporting the multi-directory configuration. #294

LykxSassinator · 2023-02-15T07:29:55Z

Brief Introduction

Close #257 .

This pr is used to support the auxiliary directory feature, referring to the previous pr: #261.
It mainly contains:

Add an extra configuration auxiliary-dir to enable this feature. Default is None, and if set with Some(...), this directory will be used if the main dir is full, specified by dir option.

IMO, auxiliary-dir is more conspicuous to understand and use for users, compared to the previous name secondary-dir.

Signed-off-by: Lucasliang <[email protected]>

codecov · 2023-02-15T07:59:50Z

Codecov Report

Patch coverage: 98.68% and project coverage change: +0.08 🎉

Comparison is base (404e3fe) 97.79% compared to head (b8ff5bd) 97.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #294      +/-   ##
==========================================
+ Coverage   97.79%   97.88%   +0.08%     
==========================================
  Files          30       30              
  Lines       11454    11998     +544     
==========================================
+ Hits        11202    11744     +542     
- Misses        252      254       +2

Impacted Files	Coverage Δ
src/env/default.rs	`92.47% <75.00%> (-1.49%)`	⬇️
src/file_pipe_log/pipe_builder.rs	`95.85% <94.54%> (+0.33%)`	⬆️
src/file_pipe_log/pipe.rs	`98.40% <96.36%> (-0.08%)`	⬇️
src/config.rs	`97.63% <100.00%> (+0.05%)`	⬆️
src/engine.rs	`98.63% <100.00%> (+0.34%)`	⬆️
src/errors.rs	`100.00% <100.00%> (ø)`
src/file_pipe_log/log_file.rs	`100.00% <100.00%> (ø)`
src/log_batch.rs	`98.07% <100.00%> (-0.22%)`	⬇️
tests/failpoints/test_engine.rs	`99.89% <100.00%> (+0.01%)`	⬆️
tests/failpoints/test_io_error.rs	`100.00% <100.00%> (ø)`
... and 5 more

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Signed-off-by: Lucasliang <[email protected]>

LykxSassinator · 2023-02-16T04:22:30Z

ping @tabokie PTAL, thx. This pr is a successor to the obsolete #261.

src/engine.rs

tabokie · 2023-02-21T02:47:58Z

src/file_pipe_log/pipe.rs

+/// Main directory path id.
 pub const DEFAULT_PATH_ID: PathId = 0;
+/// Auxiliary directory path id.
+pub const AUXILIARY_PATH_ID: PathId = 1;


I doubt this is necessary. What if there're 100 directories? Maybe just iterate them all whenever needing a dir.

I hold the different perspective on this point.

Firstly, the original design to this is to support an EXTRA dir to store logs if and only if the main dir is full, ideally placed on another DEVICE. It serves the target that the directory of storing raft logs could be placed on an individual device to make IOs individual to other dirs' IO operations.

Secondly, in normal cases, two directories, specified by dir and auxiliary_dir, are enough for the practical production envs. And we do not expect to support 3,4, or more dir lists for users.

So, I still recommend to use this design.

It is contradicting the whole point of using a vector as paths. If you need to hardcode the path ID, it is clearly better to just use two variables dir1 and dir2, because it checks the code statically instead of runtime (via vector indexing). And my originally idea of using a vector is to not restricting the amount of directories. For example, if in the future we would support #258, user can configure multiple disks to increase the write parallelism.

tabokie · 2023-02-21T02:54:25Z

src/file_pipe_log/pipe.rs

+        if idx >= paths.len() {
+            break;
+        }
+        let disk_stats = match fs2::statvfs(&paths[idx]) {


Ignore error, and avoid syscall when there's only one dir.

debug_assert!(!paths.is_empty()); if paths.len() > 1 { for (i, p) in paths.iter().enumerate() { if let Ok(stats) = fs2::statvfs(p) { if stats.space > target { return i; } } } } return 0;

IMO, we need Err, which means that there exists no free space for generating new files.

Two reasons: (1) statvfs is only a hint. There could be another user deleting files or creating files. The result of fetch_dir doesn't promise anything at all. And it is false to rely on it. (2) All the error handling logic is already in place, adding another code path that handles the error of fetch_dir is redundant. Even if they (fetch_dir().is_err() and write().is_err()) share the same code path, it is always superior to have fewer exit points.

src/log_batch.rs

Signed-off-by: Lucasliang <[email protected]>

src/engine.rs

src/file_pipe_log/pipe.rs

src/log_batch.rs

src/config.rs

src/engine.rs

src/file_pipe_log/pipe_builder.rs

Signed-off-by: Lucasliang <[email protected]>

src/engine.rs

src/file_pipe_log/pipe.rs

…pace_left. Signed-off-by: Lucasliang <[email protected]>

Signed-off-by: Lucasliang <[email protected]>

src/errors.rs

src/file_pipe_log/log_file.rs

src/file_pipe_log/pipe.rs

tabokie · 2023-02-27T14:22:58Z

src/file_pipe_log/pipe.rs

            if let Err(te) = writer.truncate() {
                panic!(
                    "error when truncate {} after error: {}, get: {}",
                    seq, e, te
                );
            }
-            return Err(e);
+            if is_no_space_err(&e) {
+                // To avoid incorrect `rotate_imp` on the same dir when the size of


I don't understand. If the available space is less than buf_bytes.len(), it should panic when actually writing that buf_bytes, instead of panicking here too early.

In this case, it won't panic but fail on engine.write(...) unexpectedly.
Given that we have a two directories setting with dir and spill-dir. If dir has free space for rotating several new log files, but no enough space for dumping the given buf. And spill-dir has free space for dumping this buf.
That is:

buf_bytes.len() > target_file_size == true;

n * target_file_size < dir.spare_space() && buf_bytes.len() > dir.spare_space() && buf_bytes.len() < spill-dir.spare_space().

Then, with the previous rotate_imp(self.target_file_size),

First attempt for writing, failed on self.write() and try to rotate.

As target_file_size < dir.spare_space(), rotate_imp(target_file_size) successfully, and returned TryAgain(...) to trigger the second attempt for write. (Naming this newly rotated file as rotate-1.)

Secondly, it tried to dump this buf into rotate-1. But self.write() failed again as the dir.spare_space() < buf_bytes.len(), and it returned the NOSPAC error. Buffer still could not be dumped into current rotate-1 file. Then, it made the next rotate_imp(). And unfortunately, it succeed again because the dir still had enough space for rotating a new file. So, it returned TryAgain() error again. It would cause the final failure on engine.write(...).

The whole write of this LogBatch failed because its trying times on write exceed the trying limitation. However, the spill-dir still had enough space for it.

For example, given that, target_file_size == 1MB, dir.spare_space() == 1.5MB, spill-dir.spare_space() == 100MB and buf_bytes.len() == 3MB. The above steps would be executed.

Compiling raft-engine v0.3.0 (/nvme1n1/lucasliang/workspace/raft-engine) Finished test [unoptimized + debuginfo] target(s) in 13.33s Running tests/failpoints/mod.rs (target/debug/deps/failpoints-23610de2336687d7) thread 'test_engine::test_build_engine_with_spill_dir' panicked at 'called `Result::unwrap()` on an `Err` value: TryAgain("Failed to write logbatch, exceed max_retry_count: (2), err: failed to write 41 file, get IO Error: Custom { kind: StorageFull, error: \"nospace\" } try to flush it to another dir")', tests/failpoints/test_engine.rs:37:40

Signed-off-by: Lucasliang <[email protected]>

src/log_batch.rs

tabokie · 2023-03-01T05:39:16Z

src/file_pipe_log/pipe.rs

@@ -258,7 +263,7 @@ impl<F: FileSystem> SinglePipe<F> {
        fail_point!("file_pipe_log::append");
        let mut writable_file = self.writable_file.lock();
        if writable_file.writer.offset() >= self.target_file_size {
-            if let Err(e) = self.rotate_imp(&mut writable_file) {
+            if let Err(e) = self.rotate_imp(&mut writable_file, self.target_file_size) {


Let's ignore this case temporarily (assume buf.len is always smaller than target_file_size). You can improve it in another PR. Because it's a bit complicated than this, you also have to consider recycled file. E.g. recycled_file + available_space is not enough, but all recycled_files + available_space is enough.

That's right. I've considered it and will patch it just in this PR. But I'm struggling with how to add an unit case for this.

I'll update it in next commit, thx for any supplementary comments.

src/file_pipe_log/pipe_builder.rs

…ll exists recycled files. Signed-off-by: Lucasliang <[email protected]>

Signed-off-by: Lucasliang <[email protected]>

src/engine.rs

src/log_batch.rs

tabokie · 2023-03-02T05:11:02Z

src/log_batch.rs

+            // `BufState::Sealed` means that `LogBatch` is under a repeated state of dumping.
+            BufState::Encoded(header_offset, entries_len)
+            | BufState::Sealed(header_offset, entries_len) => {
+                self.item_batch.prepare_write(&mut self.buf, file_context)?;


What if item batch is empty?

Suggested change

self.item_batch.prepare_write(&mut self.buf, file_context)?;

self.item_batch.prepare_write(&mut self.buf[header_offset + HEADER_LEN + entries_len ..], file_context)?;

What if item batch is empty?

In this case, it will return Ok(0) directly when calling engine.write(...).

raft-engine/src/engine.rs

Lines 138 to 141 in 404e3fe

pub fn write(&self, log_batch: &mut LogBatch, mut sync: bool) -> Result<usize> {

if log_batch.is_empty() {

return Ok(0);

}

Better make the function more robust. Skip writing when empty should only be an optimization instead of being depended on.

Better make the function more robust. Skip writing when empty should only be an optimization instead of being depended on.

Got.

tabokie · 2023-03-02T06:07:41Z

src/file_pipe_log/pipe.rs

+            // current buffer is too huge to be appended directly. So, we should free
+            // enough space by clearing several recycled log files until this buffer
+            // could be dumped.
+            let mut expected_size = expected_file_size;


(1) recycled file could be on a different disk than the full one
(2) should not modify the expected_file_size passed into fetch_dir. There could be another writer occupying the space you just released.
(3) if deleting recycled file is enough, there's no need to rotate, which makes the rotated file smaller than usual and hurt future performance.

This branch needs test.

Yep, these cases have already considered in this branch.

Firstly, about:

(1) recycled file could be on a different disk than the full one

That's right, this case has three corner cases(Suppose main-dir is full, and if and only if the first attempt by engine.write(...) is failed, will the whole writing progress try to enter this branch.):

main-dir has no recycled logs, and spill-dir have several recycled logs.
As the main-dir is full, the following find_available_dir must skip the main-dir, and spill-dir should prepare enough space for this write. Otherwise, the whole write progress(engine.write(...)) will fail finally with Err:TryAgain.
So, in this case, the deletion is necessary for preparing enough space for write. And if there did not exists enough space for writing this LogBatch, it will fail as expected because there truly exists no enough space on both disks.

main-dir has several recycled logs, and sum(recycled_logs.size()) < expected_file_size, but no recycled logs exist in spill-dir.
After deletion, the main-dir still have no enough space for this second attempt. So, the following find_available_dir must skip the main-dir as expected. And whether this second attempt on write will success or not depends on whether there exists enough space on spill-dir. It's expected. So, int this case, this deletion is also necessary.

Both main-dir and spill-dir have several recycled logs.
The deletion progress will try to release free space on one dir until it's enough to dump this LogBatch into this dir. If and only if free space is still not enough, that is, deleted_recycled_logs.size() + free_space.size() < expected_file_size, does fail this second write. So, the deletion should be kept.

Secondly, about:

(2) should not modify the expected_file_size passed into fetch_dir. There could be another writer occupying the space you just released.

Here, the expected_file_size do not be modified, just copy it to expected_size in this pr.

And for:

(3) if deleting recycled file is enough, there's no need to rotate, which makes the rotated file smaller than usual and hurt future performance.

Yep, unless expected_file_size <= self.target_file_size, it will do reuse recycled logs by rotate. Otherwise, it will try to free enough space and find an available dir to place this LogBatch by the following find_available_dir directly.

As for testing on this branch, I've do it by the following manual case on centos7:

#[test] fn test_build_engine_with_spill_dir() { fn mount_tmpfs(path: &str) { debug_assert!(!path.is_empty()); #[cfg(target_os = "linux")] { use std::process::Command; let mut mk_device = Command::new("sudo"); mk_device.args([ "mount", "-t", "tmpfs", "-o", "size=128M", "tmpfs", path.into(), ]); mk_device.status().expect("process failed to execute"); } } fn umount_tmpfs(path: &str) { debug_assert!(!path.is_empty()); #[cfg(target_os = "linux")] { use std::process::Command; let mut mk_device = Command::new("sudo"); mk_device.args(["umount", path.into()]); mk_device.status().expect("process failed to execute"); } } let main_dir = tempfile::Builder::new() .prefix("test_build_engine_with_spill_dir_main") .tempdir() .unwrap(); let spill_dir = tempfile::Builder::new() .prefix("test_build_engine_with_spill_dir_spill") .tempdir() .unwrap(); { // Mount a tmpfs with limited size. mount_tmpfs(main_dir.path().to_str().unwrap()); } let cfg = Config { dir: main_dir.path().to_str().unwrap().to_owned(), spill_dir: Some(spill_dir.path().to_str().unwrap().to_owned()), target_file_size: ReadableSize::mb(1), purge_threshold: ReadableSize::mb(128), enable_log_recycle: true, prefill_for_recycle: true, ..Default::default() }; let data = vec![b'x'; 17371]; let engine = Engine::open(cfg.clone()).unwrap(); let _f1 = FailGuard::new("file_pipe_log::force_choose_dir", "return"); for rid in 1..12000 { assert!(catch_unwind_silent(|| append(&engine, rid, 1, 100, Some(&data))).is_ok()); } { // TODO: failed because current pid still occupy this dir. umount_tmpfs(main_dir.path().to_str().unwrap()); } }

But I'm wondering how to release the temporarily mounted device and make it approved by CI/CD.

Honestly, I don't even know how to respond to such a long comment. If the situation is indeed so complicated, you should comment it in the code so that we can discuss line by line there.

(1.i) So, in this case, the deletion is necessary for preparing enough space for write.

You didn't check the available space of spill_dir. It might not need deletion at all.

(1.iii) The deletion progress will try to release free space on one dir until it's enough to dump this LogBatch into this dir.

Same thing as before, you don't know if the other directory has enough available space so that it can avoid deletion. And in addition to that, your code won't work if the sum of deleted files from dir1 and dir2 reaches target_size, but the the two individual directories still haven't deleted enough.

(2) Here, the expected_file_size do not be modified, just copy it to expected_size in this pr.

Well, it's a misread, but you shouldn't copy something into another with nearly the same name.

Yep, unless expected_file_size <= self.target_file_size, it will do reuse recycled logs by rotate. Otherwise, it will try to free enough space and find an available dir to place this LogBatch by the following find_available_dir directly.

I think there's some misunderstanding. I meant you don't need to rotate the active file, i.e. no need to close the file writer and open a new one.

As for testing on this branch, I've do it by the following manual case on centos7:

Just some failpoint unit tests are enough. Hardware doesn't really matter to this particular function. I only reason I asked before to test on hardware, is because I don't know if truncating a file on an already full disk can succeed.

My suggestion is to move the whole deletion outside of rotate. Like this:

fn try_make_space(target) { let used = vec![0; self.paths.len()]; for f in recycled_files { used[f.path_id] += f.handle.file_size()?; } for i in 0..self.paths.len() { if used[i] + self.paths[i].available_space > target + HEADER_LEN { // remove some. break; } } }

You didn't check the available space of spill_dir. It might not need deletion at all.

IMO, the too early and unified deletion is focused on reducing the extra checking of available_space on each dir, and unify the code into one branch expected_file_size > target_file_size. For example, the available_space consists of recycled logs and free space on each dir respectively, and the checking and deletion of recycled files should be separated individually.

As this pr has paid too long comments on this point, making it too ugly to be reviewed, I accept the previous advice that we should open another issue to focus on optimizing this issue.

src/file_pipe_log/pipe.rs

Signed-off-by: Lucasliang <[email protected]>

…ospace error. Signed-off-by: Lucasliang <[email protected]>

tabokie

is #294 (comment) tested?

tabokie · 2023-03-06T05:28:48Z

src/file_pipe_log/pipe_builder.rs

+            for (i, file_pair) in files.windows(2).enumerate() {
+                // If there exists a black hole or duplicate scenario on FileSeq, these
+                // files should be skipped and cleared.
+                if file_pair[1].seq - file_pair[0].seq != 1 {


is duplicate file tested?

Yep, this case has already been supplemented in src/engine.rs +2735 as following shows:

// Case 4: abnormal case - duplicate FileSeq among different dirs. { // Prerequisite: choose several files and duplicate them to main dir. let mut file_count = 0; std::fs::read_dir(paths[1]).unwrap().for_each(|e| { let p = e.unwrap().path(); let file_name = p.file_name().unwrap().to_str().unwrap(); if let Some(FileId { queue: LogQueue::Append, seq: _, }) = FileId::parse_file_name(file_name) { let mut dst_path = PathBuf::from(&paths[0]); dst_path.push(file_name); if file_count % 2 == 0 { std::fs::copy(p, dst_path).unwrap(); } file_count += 1; } }); } let engine = engine.reopen(); // Duplicate log files will be skipped and cleared. assert!(engine.file_span(LogQueue::Append).0 > start_5);

tabokie · 2023-03-06T05:30:46Z

update changelog.

Signed-off-by: Lucasliang <[email protected]>

LykxSassinator · 2023-03-06T07:39:32Z

is #294 (comment) tested?

Done for it in the log_batch::tests::test_empty_log_batch case.

tabokie · 2023-03-06T10:01:04Z

update changelog.

ping

LykxSassinator · 2023-03-07T02:42:47Z

update changelog.

ping

Also done in the last commit:

* Add a new configuration `spill-dir` to allow automatic placement of logs into an auxiliary directory when `dir` is full.

LykxSassinator added 4 commits February 13, 2023 16:56

Basement for supporting multi-directory configurations.

8e63ffd

Signed-off-by: Lucasliang <[email protected]>

Add extra normal cases for multi-directory configurations..

bb4b0ce

Signed-off-by: Lucasliang <[email protected]>

Supplement extra abnormal cases for multi-directories.

12ea46d

Signed-off-by: Lucasliang <[email protected]>

Polish annotations.

8ba434a

Signed-off-by: Lucasliang <[email protected]>

LykxSassinator added 4 commits February 15, 2023 19:25

Supplement extra corner cases.

d56cd51

Signed-off-by: Lucasliang <[email protected]>

Polish codes.

642f703

Signed-off-by: Lucasliang <[email protected]>

Polish codes according comments.

5dcf1c5

Signed-off-by: Lucasliang <[email protected]>

Polish test cases.

51eb236

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Feb 21, 2023

View reviewed changes

LykxSassinator added 2 commits February 21, 2023 17:30

Polish codes.

0908226

Signed-off-by: Lucasliang <[email protected]>

Polish codes according to comments

25b508b

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Feb 23, 2023

View reviewed changes

LykxSassinator added 3 commits February 23, 2023 20:06

Polish codes according to comments.

4e1d280

Signed-off-by: Lucasliang <[email protected]>

Rename the naming auxiliary_dir to spill_dir.

3382594

Signed-off-by: Lucasliang <[email protected]>

Clear unnecessary failpoints.

bde2eac

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Feb 27, 2023

View reviewed changes

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LykxSassinator added 2 commits February 27, 2023 17:39

Bugfix when rotate the writable_file and append_buffer.size() > s…

0d93570

…pace_left. Signed-off-by: Lucasliang <[email protected]>

Polish codes according to comments.

38ef1cb

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Feb 27, 2023

View reviewed changes

Polish codes.

8332c39

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Mar 1, 2023

View reviewed changes

LykxSassinator added 4 commits March 1, 2023 17:03

Bugfix for reusing when no enough space for the next LogBatch but sti…

485d7b2

…ll exists recycled files. Signed-off-by: Lucasliang <[email protected]>

Merge branch 'master' into auxiliary_directory

7dbbae9

Bugfix for duplicate log files on different dirs and polish codes.

50a7219

Signed-off-by: Lucasliang <[email protected]>

Polish codes

6efefb1

Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Mar 2, 2023

View reviewed changes

LykxSassinator added 2 commits March 2, 2023 17:06

Polish codes and make a minor bugfix.

cc0d0dc

Signed-off-by: Lucasliang <[email protected]>

Revoke the works on tackling the second pipe.append() when exists n…

b74c8a4

…ospace error. Signed-off-by: Lucasliang <[email protected]>

tabokie reviewed Mar 6, 2023

View reviewed changes

Supplement the ut for testing empty LogItemBatch.

b8ff5bd

Signed-off-by: Lucasliang <[email protected]>

tabokie approved these changes Mar 7, 2023

View reviewed changes

tabokie merged commit 6f58a0f into tikv:master Mar 7, 2023

LykxSassinator deleted the auxiliary_directory branch March 7, 2023 06:10

LykxSassinator mentioned this pull request Aug 5, 2024

disk-full: TiKV is not compatible to the configuration spill-dir. tikv/tikv#17356

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Auxiliary directory for supporting the multi-directory configuration. #294

Auxiliary directory for supporting the multi-directory configuration. #294

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	self.item_batch.prepare_write(&mut self.buf, file_context)?;
	self.item_batch.prepare_write(&mut self.buf[header_offset + HEADER_LEN + entries_len ..], file_context)?;

	pub fn write(&self, log_batch: &mut LogBatch, mut sync: bool) -> Result<usize> {
	if log_batch.is_empty() {
	return Ok(0);
	}

Auxiliary directory for supporting the multi-directory configuration. #294

Auxiliary directory for supporting the multi-directory configuration. #294

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