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