[ https://issues.apache.org/jira/browse/CASSANDRA-15880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Berenguer Blasi reassigned CASSANDRA-15880: ------------------------------------------- Assignee: Berenguer Blasi > Memory leak in CompressedChunkReader > ------------------------------------ > > Key: CASSANDRA-15880 > URL: https://issues.apache.org/jira/browse/CASSANDRA-15880 > Project: Cassandra > Issue Type: Bug > Components: Feature/Compression > Reporter: Jaroslaw Grabowski > Assignee: Berenguer Blasi > Priority: Normal > Fix For: 4.0, 3.11.x > > > CompressedChunkReader uses java.lang.ThreadLocal to reuse ByteBuffer for > compressed data. ByteBuffers leak due to peculiar ThreadLocal quality. > ThreadLocals are stored in a map, where the key is a weak reference to a > ThreadLocal and the value is the user's object (ByteBuffer in this case). > When a last strong reference to a ThreadLocal is lost, weak reference to > ThreadLocal (key) is removed but the value (ByteBuffer) is kept until cleaned > by ThreadLocal heuristic expunge mechanism. See ThreadLocal's "stale entries" > for details. > When a number of long-living threads is high enough this results in thousands > of ByteBuffers stored as stale entries in ThreadLocals. In a not-so-lucky > scenario we get OutOfMemoryException. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org