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Posted to issues@ozone.apache.org by "Tsz-wo Sze (Jira)" <ji...@apache.org> on 2023/05/21 09:28:00 UTC
[jira] [Updated] (HDDS-8665) OmDBSnapshotInfoCodec.copyObject(..) does not follow the general contract of copy.
[ https://issues.apache.org/jira/browse/HDDS-8665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz-wo Sze updated HDDS-8665:
-----------------------------
Description:
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 of the object will also change the other object.
{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}
was:
In OmDBSnapshotInfoCodec.copyObject(..), it currently simply returns the same object. However, if it is changed to return a real copy as below, TestOMSnapshotDeleteRequest and TestOMSnapshotPurgeRequestAndResponse will fail.
{code}
+++ b/hadoop-ozone/interface-storage/src/main/java/org/apache/hadoop/ozone/om/codec/OmDBSnapshotInfoCodec.java
@@ -53,6 +53,14 @@ public SnapshotInfo fromPersistedFormat(byte[] rawData)
@Override
public SnapshotInfo copyObject(SnapshotInfo object) {
// Note: Not really a "copy". from OMDBSnapshotInfoCodec
- return object;
+
+ // TODO: Copy will cause failures
+ // - TestOMSnapshotDeleteRequest NullPointerException
+ // - TestOMSnapshotPurgeRequestAndResponse AssertionFailedError
+ try {
+ return fromPersistedFormat(toPersistedFormat(object));
+ } catch (IOException e) {
+ throw new IllegalStateException(e);
+ }
}
}
{code}
> 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
>
> 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 of the object will also change the other object.
> {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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