SAP Service Startup 과정에 이어서, SAP HANA DB Startup 과정에 대해서도 정리한다.
1. SAP HANA DB Startup Process
1-1. OS Boot / init.d / sapinit / sapstartsrv / sapstart
여기까지는 기존 SAP Service Startup 과정과 동일하다.
OS 부팅 후, init 프로세스에 따라 sapinit 서비스가 수행되면서, /usr/sap/sapservices 파일을 읽어와 환경변수 세팅과 함께, sapstartsrv 프로세스가 시작된다.
이후 HANA DB 서비스 시작 명령어(HDB start, sapcontrol) 수행에 따라서 sapstart 프로그램이 수행된다.
1-2. HDB Daemon
sapstart 프로그램은 실제 SAP HANA 시스템을 구동하기 위해, HDB Daemon 프로세스(hdbdaemon) 를 수행한다.
HDB Daemon 프로세스는 daemon.ini 파일을 읽어와 정의된 SAP HANA Service 들을 runlevel 단계에 맞게 수행한다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000000 i Basis TraceStream.cpp(00000) : ==== Starting hdb.sap<SID>_HDB<InstNum>, version 2.00.XXX.00.0000000000 (fa/hana2spXX), build <OS Platform> <Hash Value> 2000-01-01 00:00:00 ...
...
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000001 i Daemon MainImpl.cpp(00000) : * hdbdaemon configuration file "/usr/sap/<SID>/HDB<InstNum>/<Hostname>/daemon.ini"
...
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000002 i Daemon Daemon.cpp(00000) : Line up current runlevel 0 to 5; next event "check" due in 10000 ms
...2. HDB Daemon Runlevel
기본적으로 위 순서의 Runlevel 이 daemon.ini 에 설정되어 있으며, 구성이나 설정에 따라 조금 차이가 있을 수 있다.
아래 설명은 위 단계를 따라 설명한다.
2-1. Runlevel 1
Runlevel 의 첫 단계는 Nameserver 다.
Nameserver 는 SYSTEMDB 의 핵심 서비스이며, 항상 첫번째로 시작하게 된다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
### Runlevel 0 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000003 i Daemon Daemon.cpp(00000) : Runlevel 0 started
...
### nameserver 서비스 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000004 i Daemon Program.cpp(00000) : Update runlevel of program 'nameserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000005 i Daemon Program.cpp(00000) : Instance 0 of program 'nameserver' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000005 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000006 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbnameserver' with args ''
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000007 i Daemon DaemonChild.cpp(00000) : Child program 'hdbnameserver', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000008 i Daemon RunningInstance.cpp(00000) : Start 'hdbnameserver' as process 00000, process group 00000, instance 0 of <HDB Nameserver>
...
### nameserver 서비스 시작 중...
...
### 내부 소켓통신으로 nameserver 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000009 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000010 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbnameserver'. Received message "started"
### nameserver 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000011 i Daemon DaemonHandle.cpp(00000) : Program 'hdbnameserver', pid 00000 is started
### Runlevel 수정 (0->1)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000012 i Daemon DaemonHandle.cpp(00000) : Last instance in runlevel 1 started
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000013 i Daemon Program.cpp(00000) : Update runlevel of program 'nameserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000014 i Daemon Daemon.cpp(00000) : Line up current runlevel 1 to 5; next event "check" due in 1000 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000015 i Daemon Daemon.cpp(00000) : Runlevel 1 started
...2-1. Runlevel 2
두번째 단계는 Compileserver 와 Preprocessor 서비스이다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
### compileserver 서비스 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000016 i Daemon Program.cpp(00000) : Update runlevel of program 'compileserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000017 i Daemon Program.cpp(00000) : Instance 0 of program 'compileserver' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000018 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000019 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbcompileserver' with args ''
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000020 i Daemon DaemonChild.cpp(00000) : Child program 'hdbcompileserver', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000021 i Daemon RunningInstance.cpp(00000) : Start 'hdbcompileserver' as process 00000, process group 00000, instance 0 of <HDB Compileserver>
...
### preprocessor 서비스 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000022 i Daemon Program.cpp(00000) : Update runlevel of program 'preprocessor', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000023 i Daemon Program.cpp(00000) : Instance 0 of program 'preprocessor' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000024 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000024 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbpreprocessor' with args ''
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000025 i Daemon DaemonChild.cpp(00000) : Child program 'hdbpreprocessor', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000026 i Daemon RunningInstance.cpp(00000) : Start 'hdbpreprocessor' as process 00000, process group 00000, instance 0 of <HDB Preprocessor>
...
### compileserver, preprocessor 서비스 시작 중...
...
### 내부 소켓통신으로 compileserver 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000027 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000028 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbcompileserver'. Received message "started"
### compileserver 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000029 i Daemon DaemonHandle.cpp(00000) : Program 'hdbcompileserver', pid 00000 is started
### 내부 소켓통신으로 preprocessor 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000030 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000031 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbpreprocessor'. Received message "started"
### preprocessor 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000032 i Daemon DaemonHandle.cpp(00000) : Program 'hdbpreprocessor', pid 00000 is started
...
### Runlevel 수정 (1->2)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000033 i Daemon DaemonHandle.cpp(00000) : Last instance in runlevel 2 started
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000034 i Daemon Program.cpp(00000) : Update runlevel of program 'nameserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000035 i Daemon Program.cpp(00000) : Update runlevel of program 'compileserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000036 i Daemon Program.cpp(00000) : Update runlevel of program 'preprocessor', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000037 i Daemon Daemon.cpp(00000) : Line up current runlevel 2 to 5; next event "check" due in 1000 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000038 i Daemon Daemon.cpp(00000) : Runlevel 2 started
...2-3. Runlevel 3
세번째 단계는 Indexserver 와 Xsengine 서비스이다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
### indexserver 서비스 시작 (각 Tenant DB 별)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000039 i Daemon Program.cpp(00000) : Update runlevel of program 'indexserver.<TENANTDB>', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000040 i Daemon Program.cpp(00000) : Instance X of program 'indexserver.<TENANTDB>' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000041 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000042 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbindexserver' with args '-port <TENANTDB_internal_port>'
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000043 i Daemon DaemonChild.cpp(00000) : Child program 'hdbindexserver', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000044 i Daemon RunningInstance.cpp(00000) : Start 'hdbindexserver -port <TENANTDB_internal_port>' as process 00000, process group 00000, instance X of <HDB Indexserver-<TENANTDB>>
### xsengine 서비스 시작 (각 Tenant DB 별)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000045 i Daemon Program.cpp(00000) : Update runlevel of program 'xsengine.<TENANTDB>', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000046 i Daemon Program.cpp(00000) : Instance X of program 'xsengine.<TENANTDB>' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000047 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000048 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbxsengine' with args '-port <TENANTDB_xsengine_port>'
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000049 i Daemon DaemonChild.cpp(00000) : Child program 'hdbxsengine', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000050 i Daemon RunningInstance.cpp(00000) : Start 'hdbxsengine -port <TENANTDB_xsengine_port>' as process 00000, process group 00000, instance X of <HDB XSEngine-<TENANTDB>>
...
### indexserver, xsengine 서비스 시작 중...
...
### 내부 소켓통신으로 indexserver 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000051 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000052 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbindexserver'. Received message "started"
### indexserver 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000053 i Daemon DaemonHandle.cpp(00000) : Program 'hdbindexserver', pid 00000 is started
### 내부 소켓통신으로 xsengine 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000054 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000055 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbxsengine'. Received message "started"
### xsengine 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000056 i Daemon DaemonHandle.cpp(00000) : Program 'hdbxsengine', pid 00000 is started
...
### Runlevel 수정 (2->3)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000057 i Daemon DaemonHandle.cpp(00000) : Last instance in runlevel 3 started
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000058 i Daemon Program.cpp(00000) : Update runlevel of program 'nameserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000059 i Daemon Program.cpp(00000) : Update runlevel of program 'compileserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000060 i Daemon Program.cpp(00000) : Update runlevel of program 'preprocessor', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000061 i Daemon Program.cpp(00000) : Update runlevel of program 'indexserver.<TENANTDB>', instance X
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000062 i Daemon Program.cpp(00000) : Update runlevel of program 'xsengine.<TENANTDB>', instance X
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000063 i Daemon Daemon.cpp(00000) : Line up current runlevel 3 to 5; next event "check" due in 1000 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000064 i Daemon Daemon.cpp(00000) : Runlevel 3 started
...2-4. Runlevel 4
네번째 단계는 webdispatcher 서비스이다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
### webdispathcer 서비스 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000065 i Daemon Program.cpp(00000) : Update runlevel of program 'webdispatcher', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000066 i Daemon Program.cpp(00000) : Instance 0 of program 'webdispatcher' will be started in 0 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000067 i Daemon Program.cpp(00000) : Starting instance right now
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000068 i Daemon DaemonChild.cpp(00000) : Starting program 'hdbwebdispatcher' with args ''
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000069 i Daemon DaemonChild.cpp(00000) : Child program 'hdbwebdispatcher', pid 00000 started in its own process group
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000070 i Daemon RunningInstance.cpp(00000) : Start 'hdbwebdispatcher' as process 00000, process group 00000, instance 0 of <HDB Web Dispatcher>
...
### webdispatcher 서비스 시작 중...
...
### 내부 소켓통신으로 webdispatcher 상태 체크 -> Return msg "started"
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000071 i Daemon NetworkListener.cpp(00000) : New connection accepted from 127.0.0.1/00000_tcp over socket 13
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000072 i Daemon NetworkConnection.cpp(00000) : Connection from 127.0.0.1/00000_tcp socket 13 pid 00000 'hdbwebdispatcher'. Received message "started"
### webdispatcher 서비스 시작완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000073 i Daemon DaemonHandle.cpp(00000) : Program 'hdbwebdispatcher', pid 00000 is started
### Runlevel 수정 (3->4)
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000074 i Daemon DaemonHandle.cpp(00000) : Last instance in runlevel 4 started
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000075 i Daemon Program.cpp(00000) : Update runlevel of program 'nameserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000076 i Daemon Program.cpp(00000) : Update runlevel of program 'compileserver', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000077 i Daemon Program.cpp(00000) : Update runlevel of program 'preprocessor', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000078 i Daemon Program.cpp(00000) : Update runlevel of program 'indexserver.<TENANTDB>', instance X
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000079 i Daemon Program.cpp(00000) : Update runlevel of program 'xsengine.<TENANTDB>', instance X
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000080 i Daemon Program.cpp(00000) : Update runlevel of program 'webdispatcher', instance 0
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000081 i Daemon Daemon.cpp(00000) : Line up current runlevel 4 to 5; next event "check" due in 1000 ms
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000082 i Daemon Daemon.cpp(00000) : Runlevel 4 started
...2-5. Runlevel 5
다섯번째 단계는 지금까지 시작한 서비스들을 다시 한번 체크한다.
추적 로그 daemon_<hostname>.3<Instance number>00.XXX.trc
...
### Runlevel 5 시작
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000083 i Daemon Daemon.cpp(00000) : Runlevel 5 started
### 서비스 전체 체크
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000084 i Daemon Daemon.cpp(00000) : Target runlevel lined up
### Runlevel 5 완료
[00000]{-0}[-0/-0] 2000-01-01 00:00:00.000085 i Daemon Daemon.cpp(00000) : Runlevel 5 is completed
...3. SAP HANA DB Server Components
SAP HANA 에는 여러 서버 구성요소(Server Components) 가 있으며, 각 구성요소마다 제공하는 서비스가 다르다.
3-1. Core Server
3-1-1. nameserver
SYSTEM DB 에서만 실행되는 Nameserver 는 SAP HANA 시스템의 토폴로지(topology) 정보를 가지고 있으며, 하위 TENANT DB 를 관리하는 역할을 한다.
3-1-2. indexserver
indexserver 는 각 TENANT DB 에서만 실행되며, 실제 데이터 저장과 데이터 처리를 위한 엔진이 포함되어있다.
3-1-3. compileserver
compileserver 는 프로시저(procedures) 및 프로그램의 컴파일을 수행하며, SYSTEM DB 에서만 실행된다.
3-1-4. preprocessor
Preprocessor 는 인덱스서버에서 텍스트 데이터를 분석하고, 검색에 필요한 정보를 추출하는데 사용된다. 마찬가지로 SYSTEM DB 에서만 실행된다.
3-1-5. webdispatcher
webdispathcer 는 XS Classic 서비스에 대한 HTTP, HTTPS Inbound 연결을 처리한다.
3-2. Optional Server
옵션 서버의 서비스는 HANA DB 구성 시, 필요에 따라 수동으로 추가를 해야 한다.
3-2-1. scriptserver
scriptserver 는 C++ 로 작성된 애플리캐션 함수 라이브러리를 실행하는데 사용된다.
3-2-2. docstore
docstore 서비스는 이름에 맞게 문서 저장소에 대한 레파지토리가 별도로 필요하며, 문서 저장소 내 JSON 문서에 대한 Native 작업, 다른 테이블과의 Join 작업을 지원한다.
3-2-3. XS advanced runtime
- xscontroller
- xsexeagent
- hdixuaaserver
SAP HANA 에서 애플리케이션 개발을 위한 runtime 환경을 제공한다.
기존 XS Classic 의 강점을 기반으로 더 진화된 서비스이다.
3-2-4. XS Classic Server
- xsengine
SAP HANA Extended Application Server 라 불리는 XS Classic server 는 SAP HANA 기반의 웹 어플리케이션을 위한 서비스이다.
SAP BC (2019 ~ )