xiaotongwang1 commented on issue #9484:
URL: https://github.com/apache/pulsar/issues/9484#issuecomment-773761385
[dmq@host-10-33-141-93 arthas]$ jmap -histo:live 20135|head -n 100
num #instances #bytes class name
----------------------------------------------
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8: 5336 1508352 [I
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java.util.concurrent.ConcurrentHashMap$Node
14: 5515 308840
org.apache.bookkeeper.client.LedgerFragment
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java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask
17: 9211 294752 io.netty.util.Recycler$DefaultHandle
18: 162 290336 [Lio.netty.buffer.PoolSubpage;
19: 5516 264768 java.util.HashMap
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21: 2137 188056 java.lang.reflect.Method
22: 2786 178304 io.netty.buffer.PoolSubpage
23: 5131 164192
io.netty.buffer.PoolThreadCache$MemoryRegionCache$Entry
24: 2885 161560
io.netty.channel.DefaultChannelHandlerContext
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26: 4824 154368
io.netty.buffer.PoolThreadCache$SubPageMemoryRegionCache
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org.apache.bookkeeper.bookie.storage.ldb.DbLedgerStorageDataFormats$LedgerData
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29: 301 106320
[Ljava.util.concurrent.ConcurrentHashMap$Node;
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org.apache.bookkeeper.proto.PerChannelBookieClient$AddCompletion
31: 1518 97152
com.yahoo.sketches.quantiles.HeapDoublesSketch
32: 1519 85064 java.security.Provider$Service
33: 3364 80736
com.google.protobuf.ByteString$LiteralByteString
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io.netty.util.internal.shaded.org.jctools.queues.MpscUnboundedArrayQueue
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36: 570 72136 [Ljava.lang.String;
37: 1000 72000 java.lang.reflect.Field
38: 4457 71312 java.util.jar.Attributes
39: 2971 71304 java.security.Provider$ServiceKey
40: 1669 66760 java.util.WeakHashMap$Entry
41: 60 64688 [Ljava.util.Hashtable$Entry;
42: 27 64440
[Ljava.util.concurrent.RunnableScheduledFuture;
43: 29 62008 [Ljava.nio.ByteBuffer;
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45: 680 54400 java.lang.reflect.Constructor
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io.netty.util.HashedWheelTimer$HashedWheelBucket
47: 768 49152
org.apache.bookkeeper.util.collections.ConcurrentLongLongPairHashMap$Section
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49: 122 46848
io.netty.util.concurrent.FastThreadLocalThread
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51: 722 46208 sun.security.provider.SHA2$SHA256
52: 1366 43712
org.apache.bookkeeper.proto.PerChannelBookieClient$V3CompletionKey
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org.apache.bookkeeper.client.LedgerFragmentReplicator$2
54: 1277 40864 sun.security.util.ObjectIdentifier
55: 2458 39328 java.util.concurrent.atomic.AtomicBoolean
56: 694 38864 java.lang.invoke.MemberName
57: 1204 38528 java.util.concurrent.atomic.LongAdder
58: 931 37240 java.lang.ref.SoftReference
59: 1530 36720 java.lang.Long
60: 553 35392 java.net.URL
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java.util.concurrent.atomic.Striped64$Cell
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65: 690 33120 java.util.concurrent.locks.StampedLock
66: 1326 31824 java.util.ArrayList
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io.netty.handler.codec.LengthFieldBasedFrameDecoder
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io.netty.channel.ChannelOutboundBuffer$Entry
71: 402 27872
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72: 659 26360 java.lang.invoke.MethodType
73: 821 26272 sun.security.util.DerInputBuffer
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75: 364 26208
io.netty.channel.AdaptiveRecvByteBufAllocator$HandleImpl
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org.apache.bookkeeper.util.collections.ConcurrentLongLongHashMap$Section
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78: 768 24576 io.netty.handler.codec.CodecOutputList
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org.apache.bookkeeper.util.collections.ConcurrentLongHashMap$Section
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81: 742 23744 java.net.InetAddress$InetAddressHolder
82: 367 23488 java.security.SecureRandom
83: 244 23424 java.util.jar.JarFile$JarFileEntry
84: 364 23296 io.netty.channel.ChannelOutboundBuffer
85: 364 23296
io.netty.channel.DefaultChannelPipeline$HeadContext
86: 363 23232
io.netty.channel.epoll.EpollSocketChannelConfig
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88: 552 22080 java.util.TreeMap$Entry
89: 663 21216
java.lang.invoke.MethodType$ConcurrentWeakInternSet$WeakEntry
90: 260 20992
[Ljava.lang.ThreadLocal$ThreadLocalMap$Entry;
91: 863 20712 java.util.LinkedList$Node
92: 369 20664 sun.nio.cs.UTF_8$Encoder
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io.netty.channel.DefaultChannelPipeline$TailContext
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io.netty.channel.epoll.EpollSocketChannel$EpollSocketChannelUnsafe
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java.util.concurrent.locks.StampedLock$WNode
96: 311 19904
org.apache.bookkeeper.bookie.Journal$QueueEntry
97: 821 19704 sun.security.util.DerInputStream
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