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fix store: handle invalid cache block dir #1505

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Merged
bwplotka merged 2 commits into from
Sep 15, 2019
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fix store: handle invalid cache block dir #1505

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c58038a
fix store: handle invalid cache block dir
FUSAKLA Sep 13, 2019
f55b5d0
CR: simplify empty store cache block validation logic
FUSAKLA Sep 14, 2019
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fix store: handle invalid cache block dir 
Signed-off-by: Martin Chodur <m.chodur@seznam.cz>
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@FUSAKLA
FUSAKLA committed Sep 13, 2019
commit c58038a3fd22a95218b929ac59947d4ac95b393b
4 changes: 4 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -11,6 +11,10 @@ We use *breaking* word for marking changes that are not backward compatible (rel

## Unreleased

### Fixed

-[1505](https://github.com/thanos-io/thanos/pull/1505) Thanos store now removes invalid local cache blocks.

## v0.7.0 - 2019.09.02

Accepted into CNCF:
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7 changes: 7 additions & 0 deletions pkg/block/block.go
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Expand Up @@ -153,3 +153,10 @@ func IsBlockDir(path string) (id ulid.ULID, ok bool) {
id, err := ulid.Parse(filepath.Base(path))
return id, err == nil
}

func HasMetaFile(blockPath string) bool {
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@bwplotka bwplotka Sep 13, 2019

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I am against this shallow function - such helper is not needed - the oneliner below is exactly enough for this.

In the same way, there is no Max(a, b) function is go standard library. You just do this one if on your own (:
What do you think, can we just inline this logic?

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@GiedriusS GiedriusS Sep 13, 2019

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We could do what @bwplotka suggests, it might be neater. 👍

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@FUSAKLA FUSAKLA Sep 14, 2019 •
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I eventually simplified it to checking directly for the meta file which should also provide the check for the directory existence right away. The creation of dir is agnostic to it's existence and new downloaded files should overwrite those existing in the block dir.

Thanks @bwplotka for pointing this out I just saw the IsBlockDir func so I somehow followed the pattern.

PTAL if this is ok with you.

if _, err := os.Stat(path.Join(blockPath, MetaFilename)); os.IsNotExist(err) {
return false
}
return true
}
4 changes: 2 additions & 2 deletions pkg/store/bucket.go
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Expand Up @@ -1188,8 +1188,8 @@ func (b *bucketBlock) indexCacheFilename() string {
}

func loadMeta(ctx context.Context, logger log.Logger, bucket objstore.BucketReader, dir string, id ulid.ULID) (error, *metadata.Meta) {
// If we haven't seen the block before download the meta.json file.
if _, err := os.Stat(dir); os.IsNotExist(err) {
// If we haven't seen the block before or it is missing the meta.json, download it.
if _, err := os.Stat(dir); os.IsNotExist(err) || (err == nil && !block.HasMetaFile(dir)) {
if err := os.MkdirAll(dir, 0777); err != nil {
return errors.Wrap(err, "create dir"), nil
}
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