Robert Stupp created CASSANDRA-13033: ----------------------------------------
Summary: Thread local pools never cleaned up Key: CASSANDRA-13033 URL: https://issues.apache.org/jira/browse/CASSANDRA-13033 Project: Cassandra Issue Type: Bug Reporter: Robert Stupp Assignee: Robert Stupp Fix For: 3.0.x Netty 4.x uses {{(Fast)ThreadLocal}} instances to provide a pool of (direct) buffers per thread ({{io.netty.buffer.PooledByteBufAllocator.PoolThreadLocalCache}}. However, these per-thread pools need to be cleaned up when a thread terminates ({{FastThreadLocal.removeAll()}}) - which is missing. Although the possibility that such per-thread pools ever _need_ to be cleaned up, since we rarely terminate threads, it still may actually happen and manifest in a late and hard to detect out-of-memory situation. One possibility to raise such a scenario is to regularly stop and restart the native protocol service. -- This message was sent by Atlassian JIRA (v6.3.4#6332)