af908efa41
Elasticsearch does not grant Netty reflection access to get Unsafe. The only mechanism that currently exists to free direct buffers in a timely manner is to use Unsafe. This leads to the occasional scenario, under heavy network load, that direct byte buffers can slowly build up without being freed. This commit disables Netty direct buffer pooling and moves to a strategy of using a single thread-local direct buffer for interfacing with sockets. This will reduce the memory usage from networking. Elasticsearch currently derives very little value from direct buffer usage (TLS, compression, Lucene, Elasticsearch handling, etc all use heap bytes). So this seems like the correct trade-off until that changes. |
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