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Posted to dev@hugegraph.apache.org by "bitflicker64 (via GitHub)" <gi...@apache.org> on 2026/10/02 10:54:56 UTC
[I] [Bug] Store ships rocksdb.total_memory_size of 32 GB, ignores the container memory limit, and Docker users cannot override it [hugegraph]
bitflicker64 opened a new issue, #3254:
URL: https://github.com/apache/hugegraph/issues/3254
### Bug Type (问题类型)
server status (启动/运行异常)
### Before submit
- [x] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)
Searched for `total_memory_size`, `store OOM`, `SPRING_APPLICATION_JSON` and `application-pd.yml`. #2847 contains `total_memory_size: 64GB`, but that is the reporter's own config pasted into a data-sync bug, not this problem.
### Environment (环境信息)
- Code: apache/hugegraph master `176fb56dd` (2026-10-02). All line references below are at that commit.
- Backend: HStore, 3 Stores on k3s, cluster preset of the Helm chart in hugegraph/hugegraph#221 (chart `05f3d9e`, PD/Store images of 2026-09-18), Store started with `-Xmx1024m -XX:MaxDirectMemorySize=512m`
- Data Size: load of 5M vertices with a 1 KB text property each; the Stores died from vertex 2.36M on, holding about 1.0-1.3 GB of RocksDB data and 4.2 GB of raft log each
- Run and measurements by Sebastian Gruza, 2026-09-19: https://github.com/hugegraph/hugegraph/pull/221#issuecomment-5740338545
- All three Stores in that run log profiles `"pd", "default"` and `total_memory_size:32000000000` at startup ([store-1, lines 28 and 44-48](https://github.com/SebastianGruza/hugegraph-validation/blob/52c52778263e4ba81686a86de8eac2cf4b0df7ae/results/store-oom-cluster-preset/store-1-previous.log#L28-L48)). The comment's memory accounting assumes the key is unset and falls back to the heap size; these logs show it is set.
### Expected & Actual behavior (期望与实际表现)
**Expected:** the Store's RocksDB budget fits inside the memory the process is given, or a Docker user can set it.
**Actual:** loading the data above OOM-killed all three Stores at a 4Gi container limit (`Memory cgroup out of memory: Killed process (java) anon-rss:4154896kB`), and they crash-looped afterwards. With the limit raised to 8Gi they stayed up, and store-1 measured 4.42 GiB anonymous RSS. The 8Gi limit only adds headroom; nothing bounds RocksDB below 32 GB.
Why nothing keeps RocksDB inside the limit, in code (the 4.42 GiB was not broken down per allocator, so the RocksDB share of it is not measured):
1. [`application-pd.yml:28-30`](https://github.com/apache/hugegraph/blob/176fb56dd747ef0f60a126cf721aa12d17627c31/hugegraph-store/hg-store-dist/src/assembly/static/conf/application-pd.yml#L28-L30) sets `rocksdb.total_memory_size: 32000000000`. The shipped `application.yml` includes the `pd` profile ([`application.yml:57-59`](https://github.com/apache/hugegraph/blob/176fb56dd747ef0f60a126cf721aa12d17627c31/hugegraph-store/hg-store-dist/src/assembly/static/conf/application.yml#L57-L59)). The copy inside the jar has the same value (`hg-store-node/src/main/resources/application-pd.yml:37`).
2. Because the key is set, the existing fallback in [`AppConfig.java:104-107`](https://github.com/apache/hugegraph/blob/176fb56dd747ef0f60a126cf721aa12d17627c31/hugegraph-store/hg-store-node/src/main/java/org/apache/hugegraph/store/node/AppConfig.java#L104-L107) (use `Runtime.maxMemory()` when the key is missing or `0`) never runs.
3. [`RaftRocksdbOptions.java:155-167`](https://github.com/apache/hugegraph/blob/176fb56dd747ef0f60a126cf721aa12d17627c31/hugegraph-store/hg-store-core/src/main/java/org/apache/hugegraph/store/options/RaftRocksdbOptions.java#L155-L167) splits the value into a write cache for the `WriteBufferManager` and a block cache. With the default `write_buffer_ratio` of 0.66 (`hg-store-rocksdb/.../RocksDBOptions.java:43-49`) that is about 21.1 GB and 10.9 GB. Both are native `LRUCache`s, off-heap, so together they grow with data up to 32 GB and are not limited by the heap or the cgroup. `RaftRocksdbOptions.java:69` adds a separate 1 GB `LRUCache` for the raft log storage on top.
4. The heap is limited separately. `hugegraph-store/Dockerfile:43` sets `-XX:MaxRAMPercentage=50`, but `start-hugegraph-store.sh:145-152` also passes `-Xmx` from `calc_xmx` (`util.sh:179-197`: 512 MB to 2 GB, half of free memory read from `/proc/meminfo`), and an explicit `-Xmx` takes precedence. Neither value feeds into `total_memory_size`.
5. Docker users cannot change it. [`docker-entrypoint.sh:58-70`](https://github.com/apache/hugegraph/blob/176fb56dd747ef0f60a126cf721aa12d17627c31/hugegraph-store/hg-store-dist/docker/docker-entrypoint.sh#L58-L70) builds `SPRING_APPLICATION_JSON` from the five `HG_STORE_*` variables only and exports it, so a `SPRING_APPLICATION_JSON` passed to the container is overwritten, and no `HG_STORE_*` variable maps to a `rocksdb.*` key.
Possible workaround, untested: `AppConfig.java:307-313` binds `rocksdb` as a map with `@ConfigurationProperties(prefix = "")`, so `JAVA_OPTS="... -Drocksdb.total_memory_size=<bytes>"` may reach the map key. Nobody has verified that it binds.
**Fix direction (proposal):**
- Derive the default from the memory the process actually has (cgroup limit, or the limit minus heap and direct memory) instead of a fixed 32 GB. Dropping the line from `application-pd.yml` alone would hand the budget to the `Runtime.maxMemory()` fallback, which sizes RocksDB equal to the heap; that is a smaller number but still a second heap-sized allocation on top of the first.
- Add an `HG_STORE_ROCKSDB_TOTAL_MEMORY_SIZE` (or similar) variable to the entrypoint's JSON, so container and Helm users can set it explicitly.
- `hugegraph-store/docs/deployment-guide.md:348` documents the 32 GB value and would need the same change.
### Vertex/Edge example (问题点 / 边数据举例)
Not data specific. In the reported run the OOM came once each Store held about 1.0-1.3 GB of RocksDB data.
### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)
Not schema specific. The reported run used one vertex label with a 1 KB text property.
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Re: [I] [Bug] Store ships rocksdb.total_memory_size of 32 GB, ignores the container memory limit, and Docker users cannot override it [hugegraph]
Posted by "imbajin (via GitHub)" <gi...@apache.org>.
imbajin closed issue #3254: [Bug] Store ships rocksdb.total_memory_size of 32 GB, ignores the container memory limit, and Docker users cannot override it
URL: https://github.com/apache/hugegraph/issues/3254
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Re: [I] [Bug] Store ships rocksdb.total_memory_size of 32 GB, ignores the container memory limit, and Docker users cannot override it [hugegraph]
Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.
dosubot[bot] commented on issue #3254:
URL: https://github.com/apache/hugegraph/issues/3254#issuecomment-5950866016
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<!-- Answer -->
The trace holds up, and no existing issue, PR, or prior conversation with a resolution appears to track it.
`application-pd.yml` ships `total_memory_size: 32000000000` under the `rocksdb` key [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-dist/src/assembly/static/conf/application-pd.yml#L28-L30). `RaftRocksdbOptions` splits exactly that value into the write-buffer (`writeCacheCapacity`) and block (`blockCacheCapacity`) `LRUCache`s, with no ceiling tied to heap or cgroup [[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-core/src/main/java/org/apache/hugegraph/store/options/RaftRocksdbOptions.java#L140-L150). `AppConfig.init()` falls back to `Runtime.maxMemory()` only when `total_memory_size` is absent or `"0"` [[3]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-node/src/main/java/org/apache/hugegraph/store/node/AppConfig.java#L103-L108). Because the shipped profile sets it explicitly, that fallback ne
ver runs on a default install.
The Store entrypoint builds `SPRING_APPLICATION_JSON` from only the `pdserver`, `grpc`, `raft`, `server`, and `app` keys, sourced from `HG_STORE_*` vars. It then exports it, overwriting anything a Docker user passed in, and none of those keys touch `rocksdb.*` [[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-dist/docker/docker-entrypoint.sh#L58-L70). There is currently no env-var path to override the 32 GB default in Docker/Helm.
On the workaround: `RocksdbConfig` is declared with `@ConfigurationProperties(prefix = "")` over a `Map<String, String> rocksdb` [[5]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-node/src/main/java/org/apache/hugegraph/store/node/AppConfig.java#L307-L313). Spring Boot exposes JVM system properties as a `PropertySource` ahead of relaxed binding, so `-Drocksdb.total_memory_size=<bytes>` passed through `JAVA_OPTS` should land in that map the same way the YAML values do. To Spring, both are `rocksdb.<key>` entries. Nothing in `init()` rewrites a key that's already present [[6]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-node/src/main/java/org/apache/hugegraph/store/node/AppConfig.java#L96-L119), so it will likely work. A real log showing the resulting cache sizes would confirm it.
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