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https://issues.apache.org/jira/browse/HDDS-8665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724608#comment-17724608
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Tsz-wo Sze commented on HDDS-8665:
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HDDS-8665_bug.patch: applies to 8847b2c60bcdc831a7d515c414cd9c28bbf2bbf4 for
showing the bug.
> OmDBSnapshotInfoCodec.copyObject(..) does not follow the general contract of
> copy.
> ----------------------------------------------------------------------------------
>
> Key: HDDS-8665
> URL: https://issues.apache.org/jira/browse/HDDS-8665
> Project: Apache Ozone
> Issue Type: Bug
> Components: OM, Snapshot
> Reporter: Tsz-wo Sze
> Priority: Major
> Attachments: HDDS-8665_bug.patch
>
>
> OmDBSnapshotInfoCodec.copyObject(..) is a shallow copy -- it simply returns
> the same object. However, if it is changed to return a deep copy as below,
> TestOMSnapshotDeleteRequest and TestOMSnapshotPurgeRequestAndResponse will
> fail. These two tests depend on the behavior that, after copying, changing
> one copy will also change the other copy.
> {code}
> +++
> b/hadoop-ozone/interface-storage/src/main/java/org/apache/hadoop/ozone/om/codec/OmDBSnapshotInfoCodec.java
> @@ -52,7 +52,13 @@ public SnapshotInfo fromPersistedFormat(byte[] rawData)
>
> @Override
> public SnapshotInfo copyObject(SnapshotInfo object) {
> - // Note: Not really a "copy". from OMDBSnapshotInfoCodec
> - return object;
> + // FIXME: Deep copy will cause failures
> + // - TestOMSnapshotDeleteRequest NullPointerException
> + // - TestOMSnapshotPurgeRequestAndResponse AssertionFailedError
> + try {
> + return fromPersistedFormat(toPersistedFormat(object));
> + } catch (IOException e) {
> + throw new IllegalStateException(e);
> + }
> }
> }{code}
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