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https://issues.apache.org/jira/browse/OAK-7389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595960#comment-16595960
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Amit Jain edited comment on OAK-7389 at 8/29/18 6:59 AM:
---------------------------------------------------------
Backported to:
* 1.2 with [http://svn.apache.org/viewvc?rev=1839541&view=rev]
* 1.4 with [http://svn.apache.org/viewvc?rev=1839542&view=rev]
* 1.6 with [http://svn.apache.org/viewvc?rev=1839547&view=rev]
was (Author: amitjain):
Backported to:
* 1.2 with [http://svn.apache.org/viewvc?rev=1839541&view=rev]
* 1.4 with [http://svn.apache.org/viewvc?rev=1839542&view=rev]
> Mongo/FileBlobStore does not update timestamp for already existing blobs
> ------------------------------------------------------------------------
>
> Key: OAK-7389
> URL: https://issues.apache.org/jira/browse/OAK-7389
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: blob
> Affects Versions: 1.2.14, 1.4.20, 1.8.2, 1.6.11
> Reporter: Amit Jain
> Assignee: Amit Jain
> Priority: Critical
> Labels: candidate_oak_1_0, candidate_oak_1_8
> Fix For: 1.9.0, 1.10, 1.2.30, 1.4.23, 1.6.14
>
> Attachments: OAK-7389-v1.patch, OAK-7389-v2.patch
>
>
> MongoBlobStore uses uses the {{insert}} call and ignores any exceptions which
> means any existing value won't be updated.
> {code:java}
> @Override
> protected void storeBlock(byte[] digest, int level, byte[] data) throws
> IOException {
> String id = StringUtils.convertBytesToHex(digest);
> cache.put(id, data);
> // Check if it already exists?
> MongoBlob mongoBlob = new MongoBlob();
> mongoBlob.setId(id);
> mongoBlob.setData(data);
> mongoBlob.setLevel(level);
> mongoBlob.setLastMod(System.currentTimeMillis());
> // TODO check the return value
> // TODO verify insert is fast if the entry already exists
> try {
> getBlobCollection().insertOne(mongoBlob);
> } catch (DuplicateKeyException e) {
> // the same block was already stored before: ignore
> } catch (MongoException e) {
> if (e.getCode() == DUPLICATE_KEY_ERROR_CODE) {
> // the same block was already stored before: ignore
> } else {
> throw new IOException(e.getMessage(), e);
> }
> }
> }
> {code}
> FileBlobStore also returns if there's a file already existing without
> updating the timestamp
> {code:java}
> @Override
> protected synchronized void storeBlock(byte[] digest, int level, byte[]
> data) throws IOException {
> File f = getFile(digest, false);
> if (f.exists()) {
> return;
> }
> .........
> {code}
> The above would cause data loss in DSGC if there are updates to the blob
> blocks which are re-surrected (stored again at the time of DSGC) because the
> timestamp would never have been modified.
>
> cc/ [~tmueller], [~mreutegg], [~chetanm], [~catholicon]
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