Hi: I use HBASE 2.1.6 version, and enable MOB feature on my tables then I start to input data to my table, after a while, 4 regionservers are all down, and the error log hs_err_pidxxx.log  generated in the /var/log/hbase/. after to restart the hbase, regionservers still down, it can not start again I have no idea how to check the hs_err_pidxxx.log   # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007efe5ae4ae40, pid=11890, tid=0x00007efe585d5700 # # JRE version: Java(TM) SE Runtime Environment (8.0_241-b07) (build 1.8.0_241-b07) # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.241-b07 mixed mode linux-amd64 ) # Problematic frame: # V [libjvm.so+0x649e40] void G1ParScanClosure::do_oop_nv<oopDesc*>(oopDesc**)+0x30 # # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again # # If you would like to submit a bug report, please visit: # http://bugreport.java.com/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x00007efe5405d800): GCTaskThread [stack: 0x00007efe584d5000,0x00007efe585d6000] [id=12112] siginfo: si_signo: 11 (SIGSEGV), si_code: 2 (SEGV_ACCERR), si_addr: 0x00007efe53916e78 Registers: RAX=0x00000000ed02a6a0, RBX=0x00007efdb1724bc0, RCX=0x00000000000000ed, RDX=0x00007efe54037810 RSP=0x00007efe585d45e0, RBP=0x00007efe585d45f0, RSI=0x00007efe53916d8b, RDI=0x00007efe585d4dc0 R8 =0x0000000000000000, R9 =0x00000000000000a8, R10=0x0000000000000001, R11=0x00007efe5b9733b0 R12=0x00007efdb1724ba8, R13=0x00007ef3ac13f2c8, R14=0x00007ef3ac13f048, R15=0x00007efdb1724bc0 RIP=0x00007efe5ae4ae40, EFLAGS=0x0000000000010206, CSGSFS=0x002b000000000033, ERR=0x0000000000000004 TRAPNO=0x000000000000000e Top of Stack: (sp=0x00007efe585d45e0) 0x00007efe585d45e0: 00007efe585d4dc0 00007efdb1724ba8 0x00007efe585d45f0: 00007efe585d4640 00007efe5ae48427 0x00007efe585d4600: 00007ef3ac13f2c8 00007efdb1724b98 0x00007efe585d4610: 00007efe585d4dc0 00007efe21ffbca8 0x00007efe585d4620: 00007efe585d4dc0 00007efdb1724b98 0x00007efe585d4630: 00007ef3ac13f048 00007efe585d4c50 0x00007efe585d4640: 00007efe585d4680 00007efe5ae505ff 0x00007efe585d4650: 00007efe585d4670 00007efe21ffbca8 0x00007efe585d4660: 00007efdb1724b98 0000000000000016 ................ Register to memory mapping: RAX=0x00000000ed02a6a0 is an unknown value RBX=0x00007efdb1724bc0 is pointing into object: 0x00007efdb1724b98 java.lang.Class - klass: 'java/lang/Class' RCX=0x00000000000000ed is an unknown value RDX=0x00007efe54037810 is an unknown value RSP=0x00007efe585d45e0 is an unknown value RBP=0x00007efe585d45f0 is an unknown value RSI=0x00007efe53916d8b is an unknown value RDI=0x00007efe585d4dc0 is an unknown value R8 =0x0000000000000000 is an unknown value R9 =0x00000000000000a8 is an unknown value R10=0x0000000000000001 is an unknown value R11=0x00007efe5b9733b0: <offset 0x1823b0> in /lib64/libc.so.6 at 0x00007efe5b7f1000 R12=0x00007efdb1724ba8 is pointing into object: 0x00007efdb1724b98 java.lang.Class - klass: 'java/lang/Class' R13=0x00007ef3ac13f2c8 is pointing into metadata R14=0x00007ef3ac13f048 is pointing into metadata R15=0x00007efdb1724bc0 is pointing into object: 0x00007efdb1724b98 java.lang.Class - klass: 'java/lang/Class' Stack: [0x00007efe584d5000,0x00007efe585d6000], sp=0x00007efe585d45e0, free space=1021k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x649e40] void G1ParScanClosure::do_oop_nv<oopDesc*>(oopDesc**)+0x30 V [libjvm.so+0x647427] InstanceKlass::oop_oop_iterate_backwards_nv(oopDesc*, G1ParScanClosure*)+0x167 V [libjvm.so+0x64f5ff] InstanceMirrorKlass::oop_oop_iterate_backwards_nv(oopDesc*, G1ParScanClosure*)+0x1f V [libjvm.so+0x5b14e9] G1ParScanThreadState::copy_to_survivor_space(InCSetState, oopDesc*, markOopDesc*)+0x569 V [libjvm.so+0x5b1e53] G1ParScanThreadState::trim_queue()+0x643 V [libjvm.so+0x58aefb] G1ParEvacuateFollowersClosure::do_void()+0x26b V [libjvm.so+0x59b51c] G1ParTask::work(unsigned int)+0x44c V [libjvm.so+0xaf9918] GangWorker::loop()+0xd8 V [libjvm.so+0x90f542] java_start(Thread*)+0x102 ................ 0x00007efe55d69800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=12233, stack(0x00007ef3a5424000,0x00007ef3a5525000)] 0x00007efe55d68000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=12232, stack(0x00007ef3a5525000,0x00007ef3a5626000)] 0x00007efe55d63000 JavaThread "Surrogate Locker Thread (Concurrent GC)" daemon [_thread_blocked, id=12231, stack(0x00007ef3a5626000,0x00007ef3a5727000)] 0x00007efe55d35000 JavaThread "Finalizer" daemon [_thread_blocked, id=12227, stack(0x00007ef3abc4e000,0x00007ef3abd4f000)] 0x00007efe55d30000 JavaThread "Reference Handler" daemon [_thread_blocked, id=12226, stack(0x00007ef3abd4f000,0x00007ef3abe50000)] 0x00007efe54023000 JavaThread "main" [_thread_blocked, id=12093, stack(0x00007efe5c2f7000,0x00007efe5c3f8000)] Other Threads: 0x00007efe55d26800 VMThread [stack: 0x00007ef3abe50000,0x00007ef3abf51000] [id=12225] 0x00007efe55dad800 WatcherThread [stack: 0x00007ef3a4111000,0x00007ef3a4212000] [id=12254] =>0x00007efe5405d800 (exited) GCTaskThread [stack: 0x00007efe584d5000,0x00007efe585d6000] [id=12112] VM state:at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: ([mutex/lock_event]) [0x00007efe54021810] Threads_lock - owner thread: 0x00007efe55d26800 [0x00007efe54021d10] Heap_lock - owner thread: 0x00000000021c1800 Heap: garbage-first heap total 41943040K, used 2107094K [0x00007ef435000000, 0x00007ef436005000, 0x00007efe35000000) region size 16384K, 128 young (2097152K), 4 survivors (65536K) Metaspace used 96765K, capacity 99604K, committed 99840K, reserved 100352K Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start) AC 0 HS TS 0 PTAMS 0x00007ef435800018 NTAMS 0x00007ef435800018 space 16384K, 50% used [0x00007ef435000000, 0x00007ef436000000) AC 0 HS TS 0 PTAMS 0x00007ef436800018 NTAMS 0x00007ef436800018 space 16384K, 50% used [0x00007ef436000000, 0x00007ef437000000) AC 0 F TS 0 PTAMS 0x00007ef437000000 NTAMS 0x00007ef437000000 space 16384K, 0% used [0x00007ef437000000, 0x00007ef438000000) AC 0 F TS 0 PTAMS 0x00007ef438000000 NTAMS 0x00007ef438000000 space 16384K, 0% used [0x00007ef438000000, 0x00007ef439000000)   ... 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I need help in Apache NIFI secure cluster configuration. My purpose is to create Nifi secure cluster and use ldap to manage login accounts and policies. At the first I only use ldap-user-group-provider, but it can not worked. The error message in Web UI is Insufficient Permissions Untrusted proxy CN=nifi, OU=NIFI   Then I modified my authorizers.xml to composite-user-group-provider to the following post refferenced web logs. The error message changed to Unable to locate node CN=nifi, OU=NIFI to seed policies   Me deployed steps is: I use nifi-toolkit.sh to generate certificates, command: ./nifi-toolkit-1.15.3/bin/tls-toolkit.sh standalone -C "CN=nifi, OU=NIFI" -n 'nifi' -o /root/target   My authorizers.xml <authorizers> <userGroupProvider> <identifier>file-user-group-provider</identifier> <class>org.apache.nifi.authorization.FileUserGroupProvider</class> <property name="Users File">./conf/users.xml</property> <property name="Legacy Authorized Users File"/> <property name="Initial User Identity 1">CN=nifi, OU=NIFI</property> </userGroupProvider> <userGroupProvider> <identifier>ldap-user-group-provider</identifier> <class>org.apache.nifi.ldap.tenants.LdapUserGroupProvider</class> <property name="Authentication Strategy">SIMPLE</property> <property name="Manager DN">cn=Manager,dc=nifi,dc=data</property> <property name="Manager Password">xxxx</property> <property name="TLS - Keystore"/> <property name="TLS - Keystore Password"/> <property name="TLS - Keystore Type"/> <property name="TLS - Truststore"/> <property name="TLS - Truststore Password"/> <property name="TLS - Truststore Type"/> <property name="TLS - Client Auth"/> <property name="TLS - Protocol"/> <property name="TLS - Shutdown Gracefully"/> <property name="Referral Strategy">FOLLOW</property> <property name="Connect Timeout">10 secs</property> <property name="Read Timeout">10 secs</property> <property name="Url">ldap://ldap:789</property> <property name="Page Size"/> <property name="Sync Interval">1 mins</property> <property name="Group Membership - Enforce Case Sensitivity">false</property> <property name="User Search Base">ou=users,dc=nifi,dc=data</property> <property name="User Object Class">person</property> <property name="User Search Scope">ONE_LEVEL</property> <property name="User Search Filter"/> <property name="User Identity Attribute">uid</property> <property name="User Group Name Attribute"/> <property name="User Group Name Attribute - Referenced Group Attribute"/> <property name="Group Search Base"/> <property name="Group Object Class">group</property> <property name="Group Search Scope">ONE_LEVEL</property> <property name="Group Search Filter"/> <property name="Group Name Attribute"/> <property name="Group Member Attribute"/> <property name="Group Member Attribute - Referenced User Attribute"/> </userGroupProvider> <userGroupProvider> <identifier>composite-user-group-provider</identifier> <class>org.apache.nifi.authorization.CompositeUserGroupProvider</class> <property name="Configurable User Group Provider">file-user-group-provider</property> <property name="User Group Provider 1">ldap-user-group-provider</property> </userGroupProvider> <accessPolicyProvider> <identifier>file-access-policy-provider</identifier> <class>org.apache.nifi.authorization.FileAccessPolicyProvider</class> <property name="User Group Provider">composite-user-group-provider</property> <property name="Authorizations File">./conf/authorizations.xml</property> <property name="Initial Admin Identity">nifi</property> <property name="Legacy Authorized Users File"></property> <property name="Node Identity 1">CN=nifi, OU=NIFI</property> </accessPolicyProvider> <authorizer> <identifier>managed-authorizer</identifier> <class>org.apache.nifi.authorization.StandardManagedAuthorizer</class> <property name="Access Policy Provider">file-access-policy-provider</property> </authorizer> </authorizers>   Before restart the Nifi service, I already deleted authorizations.xml and users.xml files. In restart process, I found the users.xml generated, and the content is <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <tenants> <groups/> <users> <user identifier="59486998-e3ac-3150-a4bc-c00e5a9959ba" identity="CN=nifi, OU=NIFI"/> </users> </tenants>   But Nifi start failed, from the error message is Unable to locate node CN=nifi, OU=NIFI to seed policies Nifi version is 1.15.3 Please, can anyone tell me whats wrong? Thanks. ... View more