Add accounts hard-link files into the bank snapshot directory #29496

xiangzhu70 · 2023-01-03T21:21:36Z

Problem

To construct a bank from the bank snapshot directory, we need to build up the snapshot directory to contain the full state of the snapshot. This is one of the major step, to add the accounts appendvec files into the snapshot as hardlinks.

Because hardlinking only works on the same file system partition, a hardlink directory snapshot/ is created for every slot and every account_path provided. Each <account_path>/snapshot// contains the hardlinks of the account files in run/. The bank snapshot accounts_hardlinks contain symlinks to these directories.

For example, if the accounts_paths vector has the following:
~/ledger/accounts/
/mnt/accounts/

The bank snapshot directory snapshot/ will have an accounts_hardlinks/ directory, which contains symlinks
account_path_0 -> ~/ledger/accounts/snapshot/. # hardlinks of files in ~/ledger/accounts/run
account_path_1 -> /mnt/accounts/snapshot # hardlinks of files in /mnt/accounts/run

This is a split of the PR #28745

Summary of Changes

In add_bank_snapshot, add the hard-links of the accounts/ appendvec files.
Hold the reference counts of the appendvecs for the latest snapshot, to prevent the appendvecs from being recycled. The recycling would change the content of the hardlinked files. For now, a vector of SnapshotStorages is used to hold the reference counts. It could be changed to use option. But some data corruption error happened. Will debug this issue later.
There are also some other small debugging info changes to help debug the appendvec change history.

Fixes #

runtime/src/snapshot_utils.rs

runtime/src/accounts_background_service.rs

runtime/src/accounts_db.rs

runtime/src/append_vec.rs

runtime/src/snapshot_utils.rs

apfitzge

@brooksprumo hit all & more of the things I would have commented on here

runtime/src/bank.rs

runtime/src/accounts_background_service.rs

runtime/src/snapshot_package.rs

runtime/src/snapshot_utils.rs

runtime/src/accounts_background_service.rs

runtime/src/snapshot_utils.rs

apfitzge

Will need to go over this again, but submitting some initial thoughts + nits.

@xiangzhu70 I think one thing that would be really valuable for the PR (and for people looking back without as much context in the future) is if you added an example of what the new snapshot & accounts directories look like in the PR description - preferrably with multiple accounts_dirs.

core/tests/snapshots.rs

core/src/snapshot_packager_service.rs

runtime/src/accounts_background_service.rs

runtime/src/snapshot_utils.rs

runtime/src/accounts_background_service.rs

apfitzge · 2023-02-01T19:48:45Z

runtime/src/accounts_background_service.rs

@@ -141,14 +141,16 @@ pub struct SnapshotRequestHandler {
    pub accounts_package_sender: Sender<AccountsPackage>,
 }

+type AccountStorages = Vec<Arc<AccountStorageEntry>>;
+
 impl SnapshotRequestHandler {
    // Returns the latest requested snapshot slot, if one exists


Comment is out of date; we also return the snapshot storages.

Actually...is this comment even correct either? It returns blockheight, not slot. @brooksprumo

This is not related to the changes in this PR. not sure if I should make this change here.

updated the comment.

Thanks for fixing + updating the comment. I was originally suggesting it should be done here until I noticed the blockheight/slot mismatch - but better to have it fixed now that we've seen it!

runtime/src/snapshot_utils.rs

apfitzge · 2023-02-01T20:28:20Z

runtime/src/snapshot_utils.rs

+/// Hard-link the files from accounts/ to snapshot/<bank_slot>/accounts/
+/// This keeps the appendvec files alive and with the bank snapshot.  The slot and id
+/// in the file names are also updated in case its file is a recycled one with inconsistent slot
+/// and id.


I think I'm missing where are the slot and id in the file names updated

great finding! I had the code which does the updating. Somehow it was lost when making the multi account_path changes. Now I get the code back. Thanks!

runtime/src/snapshot_utils.rs

…t_dirs

brooksprumo

lgtm!

brooksprumo · 2023-02-15T16:48:07Z

heh, do you want me to re-review after I've approved the PR?

xiangzhu70 · 2023-02-15T17:34:04Z

do you want me to re-review after I've approved the PR?

Oh, I didn't notice your approval earlier. No need to re-review again. Many thanks for all the review work!

xiangzhu70 marked this pull request as ready for review January 4, 2023 04:57

xiangzhu70 requested review from jeffwashington, brooksprumo and apfitzge January 4, 2023 04:57

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brooksprumo mentioned this pull request Jan 5, 2023

Adds SnapshotError::IoWithSourceAndFile #29527

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch from 8de9cde to 340f1c9 Compare January 5, 2023 16:15

xiangzhu70 mentioned this pull request Jan 5, 2023

Refine appendvec sanitize error message to include path #29541

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch from a45da45 to 379df31 Compare January 5, 2023 22:49

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch 2 times, most recently from 0194e90 to aa74ca6 Compare January 19, 2023 01:33

xiangzhu70 mentioned this pull request Jan 20, 2023

Add run parent directory for accounts files #29794

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch from bd94a92 to 196c679 Compare January 25, 2023 01:48

xiangzhu70 requested review from apfitzge and brooksprumo January 25, 2023 07:07

xiangzhu70 mentioned this pull request Jan 25, 2023

Revert "Add run parent directory for accounts files (#29794)" #29899

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch 2 times, most recently from d991fe5 to 72868f0 Compare January 31, 2023 18:42

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xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch 3 times, most recently from 36f26b0 to 3b2dc90 Compare February 2, 2023 16:24

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xiangzhu70 added 18 commits February 15, 2023 07:56

minor comment spelling fix

3123e1b

rebasing fixes

822d365

fix rebase issues; with_extension

9a23695

comments changes for review

b74a906

misc minor review issues

216d3fe

bank.fill_bank_with_ticks_for_tests

6e8fa77

error handling on appendvec path

7e4347d

fix use_jit

857398f

minor comments refining

ba92b43

Remove type AccountStorages

47524f3

get_account_path_from_appendvec_path return changed to Option

5546504

removed appendvec_path.to_path_buf in create_accounts_run_and_snapsho…

8ba8652

…t_dirs

add test_get_snapshot_accounts_hardlink_dir

5bf5f49

update last_snapshot_storages comment

c7e4285

update last_snapshot_storages comment

719f3ec

symlink map_err

257a9e8

simplify test_get_snapshot_accounts_hardlink_dir with fake paths

38dda74

log last_snapshot_storages at the end of the loop

5799adf

xiangzhu70 force-pushed the add_accounts_to_bank_snapshot_dir branch from d1478f9 to 5799adf Compare February 15, 2023 15:58

brooksprumo self-requested a review February 15, 2023 16:38

brooksprumo approved these changes Feb 15, 2023

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xiangzhu70 requested review from brooksprumo and apfitzge February 15, 2023 16:45

xiangzhu70 merged commit 4909267 into solana-labs:master Feb 15, 2023

xiangzhu70 mentioned this pull request Feb 22, 2023

Clean up old account snapshot directories to avoid the file existing hardlink error #30426

Merged

xiangzhu70 mentioned this pull request Mar 9, 2023

Clean orphaned account snapshot dirs #30645

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apfitzge mentioned this pull request Jun 12, 2023

Bugfix: Account Shrink Paths must conform to account directory structure #32088

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brooksprumo mentioned this pull request Jun 13, 2023

Removes unnecessary call to purge_old_bank_snapshots() in local-cluster test #32111

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Add accounts hard-link files into the bank snapshot directory #29496

Add accounts hard-link files into the bank snapshot directory #29496

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Add accounts hard-link files into the bank snapshot directory #29496

Add accounts hard-link files into the bank snapshot directory #29496

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xiangzhu70 commented Jan 3, 2023 • edited Loading

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