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https://issues.apache.org/jira/browse/JENA-2354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17751648#comment-17751648
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Damien Obrist commented on JENA-2354:
-------------------------------------
[~andy] I was able to reproduce the observed memory pattern outside of our
application with a simple program which creates datasets and loads some sample
data (30k triples, around 200MB folder size):
[^tdb-490-memory-increase.zip]
Here are the results when running the code with 4.8.0 and 4.9.0. Comparing the
two memory profiles, it looks to me like 4.8.0 is able to free up memory,
whereas with 4.9.0, memory is not freed but gradually piles up.
h4. TDB 4.8.0
Successfully creates the 50 datasets.
!tdb-490-memory-increase-4.8.0-memory.png|width=801,height=221!
h4. TDB 4.9.0
Fails during the creation of the 36th dataset with the same OOM exception.
!tdb-490-memory-increase-4.9.0-memory.png|width=799,height=220!
!tdb-490-memory-increase-4.9.0-exception.png|width=789,height=490!
> OOM / increased memory consumption with TDB 4.9.0
> -------------------------------------------------
>
> Key: JENA-2354
> URL: https://issues.apache.org/jira/browse/JENA-2354
> Project: Apache Jena
> Issue Type: Bug
> Components: TDB2
> Affects Versions: Jena 4.9.0
> Reporter: Damien Obrist
> Assignee: Andy Seaborne
> Priority: Major
> Attachments: tdb-4.8.0-run-2-memory.png, tdb-4.9.0-run-6-memory.png,
> tdb-4.9.0-run-7-memory.png, tdb-490-memory-increase-4.8.0-memory.png,
> tdb-490-memory-increase-4.9.0-exception.png,
> tdb-490-memory-increase-4.9.0-memory.png, tdb-490-memory-increase.zip
>
>
> I have observed that after upgrading from TDB 4.8.0 to 4.9.0, memory
> consumption seems to have increased substantially.
> Our application creates many TDB datasets, which are queried and updated
> concurrently. To profile the memory increase, I have implemented a small
> script, which creates up to 50 of our application-level objects, one after
> another. Each of these objects is backed by a TDB dataset under the hood,
> which gets created from scratch and filled with data (around 30k triples,
> 200MB folder size).
> The following shows the memory profiles when running the script against our
> application for both TDB 4.8.0 / 4.9.0 and using 1G of heap space.
> h3. TDB 4.8.0
> Memory increases only slightly and the script completes the creation of all
> 50 objects / TDB datasets:
> !tdb-4.8.0-run-2-memory.png|width=800,height=207!
> h3. TDB 4.9.0
> Memory increases fast and the application crashes with an OOM after having
> created 8 objects / TDB datasets, during the creation of the 9th:
> !tdb-4.9.0-run-6-memory.png|width=800,height=207!
> Stack trace:
> {code:java}
> java.lang.OutOfMemoryError: Java heap space
> at
> com.github.benmanes.caffeine.cache.FrequencySketch.ensureCapacity(FrequencySketch.java:92)
> at com.github.benmanes.caffeine.cache.SSMS.<init>(Unknown Source)
> at
> java.base/java.lang.invoke.LambdaForm$DMH/0x00000008028f7c40.newInvokeSpecial(LambdaForm$DMH)
> at
> java.base/java.lang.invoke.DelegatingMethodHandle$Holder.reinvoke_L(DelegatingMethodHandle$Holder)
> at
> java.base/java.lang.invoke.LambdaForm$MH/0x00000008028f7040.invoke_MT(LambdaForm$MH)
> at
> com.github.benmanes.caffeine.cache.LocalCacheFactory.loadFactory(LocalCacheFactory.java:86)
> at
> com.github.benmanes.caffeine.cache.LocalCacheFactory.newBoundedLocalCache(LocalCacheFactory.java:40)
> at
> com.github.benmanes.caffeine.cache.BoundedLocalCache$BoundedLocalManualCache.<init>(BoundedLocalCache.java:3947)
> at
> com.github.benmanes.caffeine.cache.BoundedLocalCache$BoundedLocalManualCache.<init>(BoundedLocalCache.java:3943)
> at com.github.benmanes.caffeine.cache.Caffeine.build(Caffeine.java:1051)
> at
> org.apache.jena.atlas.lib.cache.CacheCaffeine.<init>(CacheCaffeine.java:62)
> at
> org.apache.jena.atlas.lib.CacheFactory.createCache(CacheFactory.java:45)
> at
> org.apache.jena.atlas.lib.CacheFactory.createCache(CacheFactory.java:33)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableCache.createCache(NodeTableCache.java:101)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableCache.<init>(NodeTableCache.java:95)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableCache.create(NodeTableCache.java:87)
> at
> org.apache.jena.tdb2.store.TDB2StorageBuilder.addNodeTableCache(TDB2StorageBuilder.java:302)
> at
> org.apache.jena.tdb2.store.TDB2StorageBuilder.buildNodeTable(TDB2StorageBuilder.java:287)
> at
> org.apache.jena.tdb2.store.TDB2StorageBuilder.buildStorage(TDB2StorageBuilder.java:189)
> at
> org.apache.jena.tdb2.store.TDB2StorageBuilder.build(TDB2StorageBuilder.java:97)
> at org.apache.jena.tdb2.sys.StoreConnection.make(StoreConnection.java:95)
> at
> org.apache.jena.tdb2.sys.StoreConnection.connectCreate(StoreConnection.java:63)
> at
> org.apache.jena.tdb2.sys.DatabaseOps.createSwitchable(DatabaseOps.java:139)
> at org.apache.jena.tdb2.sys.DatabaseOps.create(DatabaseOps.java:86)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection.build(DatabaseConnection.java:112)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection.lambda$make$0(DatabaseConnection.java:74)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection$$Lambda$8502/0x00000008028e3c40.apply(Unknown
> Source)
> at
> java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection.make(DatabaseConnection.java:74)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection.connectCreate(DatabaseConnection.java:63)
> at
> org.apache.jena.tdb2.sys.DatabaseConnection.connectCreate(DatabaseConnection.java:54)
> at org.apache.jena.tdb2.DatabaseMgr.DB_ConnectCreate(DatabaseMgr.java:41)
> {code}
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