Elasticsearch崩溃解决办法

部分日志如下：

# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 2060255232 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_linux.cpp:2640), pid=14587, tid=0x00007ff9ff3d8700
#
# JRE version:  (8.0_131-b11) (build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.131-b11 mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#

---------------  T H R E A D  ---------------
Current thread (0x00007ff9f800b000):  JavaThread "Unknown thread" [_thread_in_vm, id=14604, stack(0x00007ff9ff2d8000,0x00007ff9ff3d9000)]

Stack: [0x00007ff9ff2d8000,0x00007ff9ff3d9000],  sp=0x00007ff9ff3d7370,  free space=1020k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0xac826a]  VMError::report_and_die()+0x2ba
V  [libjvm.so+0x4fd4cb]  report_vm_out_of_memory(char const*, int, unsigned long, VMErrorType, char const*)+0x8b
V  [libjvm.so+0x924f53]  os::Linux::commit_memory_impl(char*, unsigned long, bool)+0x103
V  [libjvm.so+0x9254a9]  os::pd_commit_memory(char*, unsigned long, unsigned long, bool)+0x29
V  [libjvm.so+0x91f6ca]  os::commit_memory(char*, unsigned long, unsigned long, bool)+0x2a
V  [libjvm.so+0xac3fc9]  VirtualSpace::expand_by(unsigned long, bool)+0x199
V  [libjvm.so+0xac4b1e]  VirtualSpace::initialize(ReservedSpace, unsigned long)+0xee
V  [libjvm.so+0x5fb921]  CardGeneration::CardGeneration(ReservedSpace, unsigned long, int, GenRemSet*)+0xf1
V  [libjvm.so+0x4e6b9e]  ConcurrentMarkSweepGeneration::ConcurrentMarkSweepGeneration(ReservedSpace, unsigned long, int, CardTableRS*, bool, FreeBlockDictionary<FreeChunk>::DictionaryChoice)+0x4e
V  [libjvm.so+0x5fc9e2]  GenerationSpec::init(ReservedSpace, int, GenRemSet*)+0xf2
V  [libjvm.so+0x5eb81e]  GenCollectedHeap::initialize()+0x1de
V  [libjvm.so+0xa902e3]  Universe::initialize_heap()+0xf3
V  [libjvm.so+0xa9084e]  universe_init()+0x3e
V  [libjvm.so+0x63e3e5]  init_globals()+0x65
V  [libjvm.so+0xa73f3e]  Threads::create_vm(JavaVMInitArgs*, bool*)+0x23e
V  [libjvm.so+0x6d2ce4]  JNI_CreateJavaVM+0x74
C  [libjli.so+0x745e]  JavaMain+0x9e
C  [libpthread.so.0+0x76ba]  start_thread+0xca

 

我感到一丝丝绝望，因为我的服务器内存2G,来自穷人的蓝瘦香菇。

解决办法：

1.释放内存

2.修改/etc/sysctl.config文件

   vm.swappiness = 1

3.修改elasticsearch.yml：
bootstrap.mlockall: true