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https://issues.apache.org/jira/browse/GEODE-10160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen Nichols closed GEODE-10160.
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> SizeableByteArrayList does not update the sizeInBytes for some non-overriden
> methods
> ------------------------------------------------------------------------------------
>
> Key: GEODE-10160
> URL: https://issues.apache.org/jira/browse/GEODE-10160
> Project: Geode
> Issue Type: Bug
> Components: redis
> Affects Versions: 1.15.0
> Reporter: Hale Bales
> Assignee: Steve Sienkowski
> Priority: Major
> Labels: pull-request-available, redis-triage
> Fix For: 1.15.0
>
>
> Some List methods aren't overriden in SizeableByteArrayList which means that
> the memoryOverhead doesn't get updated. add(int index, byte[] element),
> clear(), and set(int index, byte[] newElement) all need to update the size
> and don't.
> This can be accomplished by adding overrides to SizeableByteArrayList:
> {code:java}
> @Override
> public byte[] set(int index, byte[] newElement) {
> byte[] replacedElement = super.set(index, newElement);
> memberOverhead -= calculateByteArrayOverhead(replacedElement);
> memberOverhead += calculateByteArrayOverhead(newElement);
> return replacedElement;
> }
> @Override
> public void add(int index, byte[] element) {
> memberOverhead += calculateByteArrayOverhead(element);
> super.add(index, element);
> }
> {code}
> The test for set could look something like:
> {code:java}
> @Test
> public void sizeInBytesGetsUpdatedAccurately_whenDoingSets() {
> SizeableByteArrayList list = new SizeableByteArrayList();
> byte[] element = "element".getBytes(StandardCharsets.UTF_8);
> list.addFirst(element);
> long initialSize = list.getSizeInBytes();
> assertThat(initialSize).isEqualTo(sizer.sizeof(list));
> list.set(0, "some really big new element
> name".getBytes(StandardCharsets.UTF_8));
> assertThat(list.getSizeInBytes()).isEqualTo(sizer.sizeof(list));
> list.set(0, element);
> assertThat(list.getSizeInBytes()).isEqualTo(initialSize);
> }
> {code}
> We need more tests than just this one. add(int, byte[]) needs to be tested as
> well. Any method on SizeableByteArrayList that modify the data should have a
> test that the memoryOverhead gets updated correctly.
> Clear itself isn't a problem - just set the memberOverhead to 0 - but the
> issue is that for the version of LTRIM in
> [PR#7403|https://github.com/apache/geode/pull/7403], we clear a sublist of
> SizeableByteArrayList. This means that the overridden clear method does not
> get called and the LinkedList implementation of clear does not call any other
> methods that we can override. There needs to be some new approach to LTRIM
> that doesn't use sublists.
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