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Posted to issues@ozone.apache.org by "Hemant Kumar (Jira)" <ji...@apache.org> on 2023/02/02 17:45:00 UTC
[jira] [Commented] (HDDS-7870) getFileStatus return wrong response when key doesn't exist
[ https://issues.apache.org/jira/browse/HDDS-7870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683506#comment-17683506 ]
Hemant Kumar commented on HDDS-7870:
------------------------------------
Closing in favor of https://issues.apache.org/jira/browse/HDDS-7871
> getFileStatus return wrong response when key doesn't exist
> ----------------------------------------------------------
>
> Key: HDDS-7870
> URL: https://issues.apache.org/jira/browse/HDDS-7870
> Project: Apache Ozone
> Issue Type: Bug
> Components: OM
> Reporter: Hemant Kumar
> Priority: Major
>
> Snapshot restore tests were added as part of [PR|https://github.com/apache/ozone/pull/4148/files#diff-2186b1fe62df6e3d2018bb4a9491761f79cff48e1ea81c3d50f85cd5f5bda7c7R256)] and test to restore snapshot to another bucket fails sometime for *_Legacy bucket_* layout with exception *_File Exists._* In the deep dive, it was found that it is because of [PR|https://github.com/apache/ozone/pull/4038]. In the PR, [seek operation was used on RocksDB table|https://github.com/apache/ozone/pull/4038/files#diff-bde0dade7dd5ddda419499f4f999d25d40fcec1412e0ce809c36ffd1be473f22R1302-R1304] which sometime returns non-null response and causes fake dir creation. It is possible that RocksDB's seek operation uses bloom filter which doesn't guarantee that key exists (false positive).
> To fix this, we should add volume and bucket check [here|https://github.com/apache/ozone/pull/4038/files#diff-bde0dade7dd5ddda419499f4f999d25d40fcec1412e0ce809c36ffd1be473f22R1306]. We may or may not need to iterate over the iterator.
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