Hello I have a memory leak problem that my server application hangs due to out of heap exception. This kind of memory leak is very new to me so I'm not sure how can I resolve this issue. Could anyone take a look at leak suspescts and tell me if this is caused by grpc? Please let me know if you need further information from my heap dump.
Thank you in advance. *Problem Suspect 1* 5,938 instances of *"io.netty.buffer.PoolThreadCache"*, loaded by *"sun.misc.Launcher$AppClassLoader @ 0x6c621ecf8"* occupy *1,280,098,864 (57.78%)* bytes. *Problem Suspect 2* 18 instances of *"io.netty.util.concurrent.FastThreadLocalThread"*, loaded by *"sun.misc.Launcher$AppClassLoader @ 0x6c621ecf8"* occupy *477,526,856 (21.56%)* bytes. Biggest instances: - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7e01360 epollEventLoopGroup-3-9 - 36,210,360 (1.63%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7e55440 epollEventLoopGroup-3-16 - 34,013,456 (1.54%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7e06c68 epollEventLoopGroup-3-15 - 33,574,944 (1.52%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c8359008 epollEventLoopGroup-3-11 - 31,410,768 (1.42%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c808dff0 epollEventLoopGroup-3-4 - 30,982,336 (1.40%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c81be308 epollEventLoopGroup-3-5 - 30,751,936 (1.39%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7ef0ef0 epollEventLoopGroup-3-12 - 30,093,296 (1.36%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c84370a8 epollEventLoopGroup-3-10 - 28,821,824 (1.30%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7ee6d40 epollEventLoopGroup-3-13 - 28,559,312 (1.29%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c8239158 epollEventLoopGroup-3-2 - 28,383,352 (1.28%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7f5b168 epollEventLoopGroup-3-8 - 28,157,184 (1.27%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c8021f68 epollEventLoopGroup-3-6 - 28,136,600 (1.27%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c80ceb10 epollEventLoopGroup-3-1 - 28,117,656 (1.27%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c8160f90 epollEventLoopGroup-3-3 - 27,727,816 (1.25%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c7f1e778 epollEventLoopGroup-3-14 - 26,839,032 (1.21%) bytes. - io.netty.util.concurrent.FastThreadLocalThread @ 0x6c8324368 epollEventLoopGroup-3-7 - 25,741,736 (1.16%) bytes. *Problem Suspect 3* 167,233 instances of *"io.netty.util.Recycler$WeakOrderQueue"*, loaded by *"sun.misc.Launcher$AppClassLoader @ 0x6c621ecf8"* occupy *312,969,784 (14.13%)* bytes. -histo:live num #instances #bytes class name ---------------------------------------------- 1: 833363 1513088008 [Ljava.lang.Object; 2: 722280 473815680 io.netty.util.internal.shaded.org. jctools.queues.MpscArrayQueue 3: 384506 49012000 [Lio.netty.util.Recycler$DefaultHandle; 4: 230678 26402920 [C 5: 666720 21335040 io.netty.buffer. PoolThreadCache$SubPageMemoryRegionCache 6: 490524 15696768 io.netty.util.Recycler$DefaultHandle 7: 340638 13625520 io.netty.util.Recycler$WeakOrderQueue 8: 404527 12944864 io.netty.buffer. PoolThreadCache$MemoryRegionCache$Entry 9: 365494 11695808 io.netty.util. Recycler$WeakOrderQueue$Link 10: 341456 10926592 java.lang.ref.WeakReference 11: 82884 9542232 [B 12: 85442 7518896 io.netty.buffer. PooledUnsafeDirectByteBuf 13: 174182 6967280 java.util.WeakHashMap$Entry 14: 212647 5103528 java.lang.String 15: 61547 4431384 net.sf.ehcache.Element 16: 7825 4131336 [Lio.netty.handler.codec.http2.internal. hpack.HeaderField; 17: 55560 3852160 [Lio.netty.buffer. PoolThreadCache$MemoryRegionCache; -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To post to this group, send email to grpc-io@googlegroups.com. Visit this group at https://groups.google.com/group/grpc-io. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/6ed1619e-51ed-4003-ad82-2c0a78a5b6dc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
