PolarDB 100 问 | 如何处理 bulkload 编译异常
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PolarDB 100 问 | PolarDB 11 编译 pg_bulkload 插件报错
问题: PolarDB 11 编译 pg_bulkload 插件报错
报错如下:
writer_binary.c: In function ‘open_output_file’:
writer_binary.c:430:14: error: too few arguments to function ‘BasicOpenFilePerm’
430 | fd = BasicOpenFilePerm(fname, O_WRONLY | O_CREAT | O_EXCL | PG_BINARY,
| ^~~~~~~~~~~~~~~~~
In file included from /home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/utils/sharedtuplestore.h:17,
from /home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/nodes/execnodes.h:27,
from ../include/reader.h:18,
from ../include/binary.h:15,
from writer_binary.c:19:
/home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/storage/fd.h:115:17: note: declared here
115 | extern int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs);
| ^~~~~~~~~~~~~~~~~
make[1]: *** [<builtin>: writer_binary.o] Error 1
make[1]: Leaving directory '/tmp/pg_bulkload/lib'
make: *** [Makefile:27: all] Error 2
复现方法
1、搭建PolarDB开发环境, 在开发环境中通过源码编译安装PolarDB 11.
1.1、拉取一个你熟悉的操作系统的PolarDB开发环境Docker镜像, 例如ubuntu22.04:
docker pull registry.cn-hangzhou.aliyuncs.com/polardb_pg/polardb_pg_devel:ubuntu22.04
1.2、创建并运行容器
docker run -d -it -P --shm-size=1g --cap-add=SYS_PTRACE --cap-add SYS_ADMIN --privileged=true --name polardb_pg_devel registry.cn-hangzhou.aliyuncs.com/polardb_pg/polardb_pg_devel:ubuntu22.04 bash
1.3、进入容器
# 进入容器
docker exec -ti polardb_pg_devel bash
1.4、克隆PolarDB 11源码,编译部署 PolarDB-PG 实例。
# 例如这里拉取 POLARDB_11_STABLE 分支;
# PS: 截止2024.9.24 PolarDB开源的最新分支为: POLARDB_15_STABLE
cd /tmp
git clone -c core.symlinks=true --depth 1 -b POLARDB_11_STABLE https://github.com/ApsaraDB/PolarDB-for-PostgreSQL
# 编译PolarDB 11并初始化实例
cd /tmp/PolarDB-for-PostgreSQL
./polardb_build.sh --without-fbl --debug=off
# 验证PolarDB-PG
psql -c 'SELECT version();'
version
--------------------------------
PostgreSQL 11.9 (POLARDB 11.9)
(1 row)
# 在容器内关闭、启动PolarDB数据库方法如下:
pg_ctl stop -m fast -D ~/tmp_master_dir_polardb_pg_1100_bld
pg_ctl start -D ~/tmp_master_dir_polardb_pg_1100_bld
2、在容器中下载pg_bulkload源码:
cd /tmp
git clone -c core.symlinks=true --depth 1 https://github.com/ossc-db/pg_bulkload
3、编译pg_bulkload
cd /tmp/pg_bulkload
USE_PGXS=1 make install
报错如下:
In file included from /home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/storage/pg_shmem.h:30,
from recovery.c:29:
/home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/utils/hsearch.h:78:9: error: unknown type name ‘MemoryContext’
78 | MemoryContext hcxt; /* memory context to use for allocations */
| ^~~~~~~~~~~~~
make[1]: *** [<builtin>: recovery.o] Error 1
make[1]: Leaving directory '/tmp/pg_bulkload/bin'
make: *** [Makefile:27: all] Error 2
看报错应该是缺少包含MemoryContext的头文件引用, 搜索代码, 找到了这个定义在utils/palloc.h中.
/home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/utils/palloc.h
... ...
/*
* Type MemoryContextData is declared in nodes/memnodes.h. Most users
* of memory allocation should just treat it as an abstract type, so we
* do not provide the struct contents here.
*/
typedef struct MemoryContextData *MemoryContext;
... ...
修改报错的recovery.c代码:
vi bin/recovery.c
... ...
#include "storage/bufpage.h"
// 新增一个 include :
#include "utils/palloc.h"
#include "storage/pg_shmem.h"
... ...
再次编译, 出现了新的报错:
cd /tmp/pg_bulkload
USE_PGXS=1 make install
# 报错如下:
writer_binary.c: In function ‘open_output_file’:
writer_binary.c:430:14: error: too few arguments to function ‘BasicOpenFilePerm’
430 | fd = BasicOpenFilePerm(fname, O_WRONLY | O_CREAT | O_EXCL | PG_BINARY,
| ^~~~~~~~~~~~~~~~~
In file included from /home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/utils/sharedtuplestore.h:17,
from /home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/nodes/execnodes.h:27,
from ../include/reader.h:18,
from ../include/binary.h:15,
from writer_binary.c:19:
/home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/storage/fd.h:115:17: note: declared here
115 | extern int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs);
| ^~~~~~~~~~~~~~~~~
make[1]: *** [<builtin>: writer_binary.o] Error 1
make[1]: Leaving directory '/tmp/pg_bulkload/lib'
make: *** [Makefile:27: all] Error 2
看起来是pg_bulkload调用的BasicOpenFilePerm被PolarDB修改过, 和PostgreSQL 11的不兼容了.
如何解决这个报错呢?
解决办法
1、搜索PolarDB 11源码中BasicOpenFilePerm的定义
/home/postgres/tmp_basedir_polardb_pg_1100_bld/include/server/storage/fd.h
/* POLAR: add polar_vfs parameter */
extern int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs);
相比PostgreSQL 11多了一个bool polar_vfs参数.
这个polar_vfs到底应该设置为true还是false呢?
简单可以这么来理解: PolarDB 支持共享存储架构, 多个计算节点可以访问同一份数据, 因为各个机器有本地缓存(cache/file meta cache等) 访问共享存储时不能像单机PostgreSQL实例那样使用本地文件系统和本地文件操作的系统调用接口, 而是需要通过一层PolarDB自己定义的pfs, 来保证共享数据的一致性等.
看PolarDB代码的话, 很多接口都适配了polar_vfs, 例如:
/tmp/PolarDB-for-PostgreSQL/src/backend/storage/file/fd.c
typedef struct vfd
{
int fd; /* current FD, or VFD_CLOSED if none */
unsigned short fdstate; /* bitflags for VFD's state */
ResourceOwner resowner; /* owner, for automatic cleanup */
File nextFree; /* link to next free VFD, if in freelist */
File lruMoreRecently; /* doubly linked recency-of-use list */
File lruLessRecently;
off_t seekPos; /* current logical file position, or -1 */
off_t fileSize; /* current size of file (0 if not temporary) */
char *fileName; /* name of file, or NULL for unused VFD */
/* NB: fileName is malloc'd, and must be free'd when closing the VFD */
int fileFlags; /* open(2) flags for (re)opening the file */
mode_t fileMode; /* mode to pass to open(2) */
bool polar_vfs; /* POLAR: Whether to call the vfs interface */
} Vfd;
... ...
fsync_fname(const char *fname, bool isdir, bool polar_vfs)
durable_rename(const char *oldfile, const char *newfile, int elevel, bool polar_vfs)
fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel, bool polar_vfs)
fsync_parent_path(const char *fname, int elevel, bool polar_vfs)
BasicOpenFile(const char *fileName, int fileFlags, bool polar_vfs)
BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs)
PathNameOpenFile(const char *fileName, int fileFlags, bool polar_vfs)
PathNameOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs)
OpenTransientFile(const char *fileName, int fileFlags, bool polar_vfs)
OpenTransientFilePerm(const char *fileName, int fileFlags, mode_t fileMode, bool polar_vfs)
AllocateDir(const char *dirname, bool polar_vfs)
AllocateDirPerm(const char *dirname, bool polar_vfs)
MakePGDirectory(const char *directoryName, bool polar_vfs)
还有很多不一一举例
所以简单的让pg_bulkload编译通过的话, 可以直接写死true or false. 例如
找到pg_bulkload源码中调用了BasicOpenFilePerm的代码文件
cd /tmp/pg_bulkload
grep -r BasicOpenFilePerm *
lib/writer_direct.c: self->lsf_fd = BasicOpenFilePerm(self->lsf_path,
lib/writer_direct.c: fd = BasicOpenFilePerm(fname, O_CREAT | O_WRONLY | PG_BINARY, S_IRUSR | S_IWUSR);
lib/writer_binary.c: fd = BasicOpenFilePerm(fname, O_WRONLY | O_CREAT | O_EXCL | PG_BINARY,
假设全部改成 true
vi lib/writer_binary.c
#if PG_VERSION_NUM >= 110000
fd = BasicOpenFilePerm(fname, O_WRONLY | O_CREAT | O_EXCL | PG_BINARY,
S_IRUSR | S_IWUSR, true);
vi lib/writer_direct.c
#if PG_VERSION_NUM >= 110000
self->lsf_fd = BasicOpenFilePerm(self->lsf_path,
O_CREAT | O_EXCL | O_RDWR | PG_BINARY, S_IRUSR | S_IWUSR, true);
#if PG_VERSION_NUM >= 110000
fd = BasicOpenFilePerm(fname, O_CREAT | O_WRONLY | PG_BINARY, S_IRUSR | S_IWUSR, true);
重新编译就正常了.
$ cd /tmp/pg_bulkload
$ USE_PGXS=1 make install
现在可以在PolarDB 11中创建pg_bulkload插件了:
$ psql
psql (11.9)
Type "help"forhelp.
postgres=# select version();
version
--------------------------------
PostgreSQL 11.9 (POLARDB 11.9)
(1 row)
postgres=# create extension pg_bulkload;
CREATE EXTENSION
但是在使用pg_bulkload时又遇到了报错, 请看下回分解.
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参考文档点击阅读原文获得
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