Julian Sedding created OAK-12070:
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Summary: Reduce memory consumption of azure segment stores
Key: OAK-12070
URL: https://issues.apache.org/jira/browse/OAK-12070
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segment-azure
Reporter: Julian Sedding
Assignee: Julian Sedding
An Azure segmentstore consumes quite a lot of memory. Here is an extreme
example, of a store containing ~5.8mio entries.
Per segment, there are
* two UUID instances, consuming 32 bytes each
* one RemoteSegmentArchiveEntry, consuming 48 bytes each
* one java.util.LinkedHashMap$Entry, consuming 40 bytes each
I.e. each segment occupies 152 bytes in-memory, leaving some potential for
optimization.
{noformat}
num #instances #bytes class name (module)
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1: 2212920 729326320 [B ([email protected])
2: 11911003 381152096 java.util.UUID ([email protected])
3: 5793352 278080896
org.apache.jackrabbit.oak.segment.remote.RemoteSegmentArchiveEntry
4: 105964 247119568 Ljdk.internal.vm.FillerArray;
([email protected])
5: 5812476 232499040 java.util.LinkedHashMap$Entry
([email protected]){noformat}
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