mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-25 00:52:02 +00:00
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
#include <Common/config.h>
|
|
|
|
#if USE_HDFS
|
|
|
|
#include <IO/WriteBufferFromHDFS.h>
|
|
#include <IO/HDFSCommon.h>
|
|
#include <hdfs/hdfs.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int NETWORK_ERROR;
|
|
extern const int CANNOT_OPEN_FILE;
|
|
extern const int CANNOT_FSYNC;
|
|
extern const int BAD_ARGUMENTS;
|
|
}
|
|
|
|
|
|
struct WriteBufferFromHDFS::WriteBufferFromHDFSImpl
|
|
{
|
|
std::string hdfs_uri;
|
|
hdfsFile fout;
|
|
HDFSBuilderPtr builder;
|
|
HDFSFSPtr fs;
|
|
|
|
explicit WriteBufferFromHDFSImpl(const std::string & hdfs_name_)
|
|
: hdfs_uri(hdfs_name_)
|
|
, builder(createHDFSBuilder(hdfs_uri))
|
|
, fs(createHDFSFS(builder.get()))
|
|
{
|
|
const size_t begin_of_path = hdfs_uri.find('/', hdfs_uri.find("//") + 2);
|
|
const std::string path = hdfs_uri.substr(begin_of_path);
|
|
if (path.find_first_of("*?{") != std::string::npos)
|
|
throw Exception("URI '" + hdfs_uri + "' contains globs, so the table is in readonly mode", ErrorCodes::CANNOT_OPEN_FILE);
|
|
|
|
if (!hdfsExists(fs.get(), path.c_str()))
|
|
throw Exception("File: " + path + " is already exists", ErrorCodes::BAD_ARGUMENTS);
|
|
fout = hdfsOpenFile(fs.get(), path.c_str(), O_WRONLY, 0, 0, 0); /// O_WRONLY meaning create or overwrite i.e., implies O_TRUNCAT here
|
|
|
|
if (fout == nullptr)
|
|
{
|
|
throw Exception("Unable to open HDFS file: " + path + " error: " + std::string(hdfsGetLastError()),
|
|
ErrorCodes::CANNOT_OPEN_FILE);
|
|
}
|
|
|
|
}
|
|
|
|
~WriteBufferFromHDFSImpl()
|
|
{
|
|
hdfsCloseFile(fs.get(), fout);
|
|
}
|
|
|
|
|
|
int write(const char * start, size_t size)
|
|
{
|
|
int bytes_written = hdfsWrite(fs.get(), fout, start, size);
|
|
if (bytes_written < 0)
|
|
throw Exception("Fail to write HDFS file: " + hdfs_uri + " " + std::string(hdfsGetLastError()),
|
|
ErrorCodes::NETWORK_ERROR);
|
|
return bytes_written;
|
|
}
|
|
|
|
void sync()
|
|
{
|
|
int result = hdfsSync(fs.get(), fout);
|
|
if (result < 0)
|
|
throwFromErrno("Cannot HDFS sync" + hdfs_uri + " " + std::string(hdfsGetLastError()),
|
|
ErrorCodes::CANNOT_FSYNC);
|
|
}
|
|
};
|
|
|
|
WriteBufferFromHDFS::WriteBufferFromHDFS(const std::string & hdfs_name_, size_t buf_size)
|
|
: BufferWithOwnMemory<WriteBuffer>(buf_size)
|
|
, impl(std::make_unique<WriteBufferFromHDFSImpl>(hdfs_name_))
|
|
{
|
|
}
|
|
|
|
|
|
void WriteBufferFromHDFS::nextImpl()
|
|
{
|
|
if (!offset())
|
|
return;
|
|
|
|
size_t bytes_written = 0;
|
|
|
|
while (bytes_written != offset())
|
|
bytes_written += impl->write(working_buffer.begin() + bytes_written, offset() - bytes_written);
|
|
}
|
|
|
|
|
|
void WriteBufferFromHDFS::sync()
|
|
{
|
|
impl->sync();
|
|
}
|
|
|
|
WriteBufferFromHDFS::~WriteBufferFromHDFS()
|
|
{
|
|
try
|
|
{
|
|
next();
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(__PRETTY_FUNCTION__);
|
|
}
|
|
}
|
|
|
|
}
|
|
#endif
|