[Question] i have deploy hugegraph server( singel node), write occur error: org.apache.hugegraph.exception.ServerException: The rest server is too busy to write about incubator-hugegraph HOT 3 OPEN

The error you're encountering, org.apache.hadoop.hbase.ipc.ServerNotRunningYetException: The rest server is too busy to write, suggests that the HugeGraph server is experiencing high load, which is impacting its ability to process write requests efficiently. Here are targeted suggestions to address this issue:

1. Optimize HugeGraph and RocksDB Configurations: Adjust RocksDB settings like max_background_jobs, write_buffer_size, and max_open_files to better match your hardware capabilities, potentially improving performance under load.

2. Increase Iterator Pool Capacity: The error might be related to the capacity of the iterator pool. Increasing the ITERATOR_POOL_CAPACITY in RocksDBIteratorPool.java could help manage load more effectively by allowing more iterators to be pooled concurrently.

3. Enable Iterator Reusing: In ReusedRocksIterator.java, changing REUSING_ENABLED from false to true can reduce the overhead associated with iterator creation and destruction, which is beneficial under high load scenarios.

4. Benchmark Code Optimization: Review your benchmarking approach to ensure it doesn't overwhelm the server. Adjusting the rate of requests or the level of concurrency might prevent the server from becoming too busy to write.

5. Server Performance Monitoring: Utilize monitoring tools to identify performance bottlenecks. This can guide further optimizations, whether in configuration or hardware adjustments.

6. Update HugeGraph and RocksDB: Ensure you're using the latest versions as they may include relevant performance improvements or bug fixes.

For specific RocksDB configurations:

• max_background_jobs: Consider setting this to a higher value to allow more concurrent background processes.
• write_buffer_size: Increasing this can help manage write workload spikes more effectively.
• max_open_files: Setting this to -1 or a high number can reduce file operation overhead, aiding in performance under heavy load.

These adjustments are starting points. Monitoring and iterative tuning based on actual performance are crucial for achieving optimal configurations.

Sources

• hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBIteratorPool.java
• hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBOptions.java

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@dosu-bot could u help to find the relative context/issues & give some suggestion?

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Due to the lack of activity, the current issue is marked as stale and will be closed after 20 days, any update will remove the stale label

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