ceph中librados接口怎么用
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rados_getxattr获取对象属性
rados_getxattrs获取对象属性列表
rados_getxattrs_next从获取的对象属性列表中读取值
rados_getxattrs_end释放rados_getxattrs获取的指针
rados_setxattr设置对象的自定义属性
rados_rmxattr删除对象的自定义属性
rados_stat返回对象的时间、大小
rados_tmap_update
rados_tmap_put
rados_tmap_get
rados_tmap_to_omap
使用示例
#include
#include
#include
int main(int argc, const char **argv)
{
int ret = 0 ;
/*
* Errors are not checked to avoid pollution.
* After each Ceph operation:
* if (ret < 0) error_condition
* else success
*/
// Get cluster handle and connect to cluster
std::string cluster_name("ceph");
std::string user_name("client.admin");
librados::Rados cluster ;
cluster.init2(user_name.c_str(), cluster_name.c_str(), 0);
cluster.conf_read_file("/etc/ceph/ceph.conf");
cluster.connect();
// IO context
librados::IoCtx io_ctx ;
std::string pool_name("data");
cluster.ioctx_create(pool_name.c_str(), io_ctx);
// Write an object synchronously
librados::bufferlist bl;
std::string objectId("hw");
std::string objectContent("Hello World!");
bl.append(objectContent);
io_ctx.write(objectId, bl, objectContent.size(), 0);
// Add an xattr to the object.
librados::bufferlist lang_bl;
lang_bl.append("en_US");
io_ctx.setxattr(objectId, "lang", lang_bl);
// Read the object back asynchronously
librados::bufferlist read_buf;
int read_len = 4194304;
//Create I/O Completion.
librados::AioCompletion *read_completion = librados::Rados::aio_create_completion();
//Send read request.
io_ctx.aio_read(objectId, read_completion, &read_buf, read_len, 0 );
// Wait for the request to complete, and print content
read_completion->wait_for_complete();
read_completion->get_return_value();
std::cout<< "Object name: " << objectId << "\n"
<< "Content: " << read_buf.c_str() << std::endl ;
// Read the xattr.
librados::bufferlist lang_res;
io_ctx.getxattr(objectId, "lang", lang_res);
std::cout<< "Object xattr: " << lang_res.c_str() << std::endl ;
// Print the list of pools
std::list
cluster.pool_list(pools );
std::cout << "List of pools from this cluster handle" << std::endl ;
for (std::list
std::cout << *i << std::endl;
// Print the list of objects
librados::ObjectIterator oit=io_ctx.objects_begin();
librados::ObjectIterator oet=io_ctx.objects_end();
std::cout<< "List of objects from this pool" << std::endl ;
for(; oit!= oet; oit++ ) {
std::cout << "\t" << oit->first << std::endl ;
}
// Remove the xattr
io_ctx.rmxattr(objectId, "lang");
// Remove the object.
io_ctx.remove(objectId);
// Cleanup
io_ctx.close();
cluster.shutdown();
return 0 ;
}
保存为cephrados.cpp,编译命令行如下
g++ cephrados.cpp -lrados -o cephrados
rados getxattr rbd.py lang -p data显示data池中对象rbd.py的扩展属性lang的值
rados listxattr -p data rbd.py显示data池中对象rbd.py的扩展属性,如果没有设置显示为空
rados stat rbd.py -p data 显示data池中对象rbd.py的大小、时间
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