ClickHouse/dbms/src/Storages/StorageHDFS.cpp

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#include <Common/config.h>
#if USE_HDFS
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#include <Storages/StorageFactory.h>
#include <Storages/StorageHDFS.h>
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#include <Interpreters/Context.h>
#include <Interpreters/evaluateConstantExpression.h>
#include <Parsers/ASTLiteral.h>
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#include <IO/ReadHelpers.h>
#include <IO/ReadBufferFromHDFS.h>
#include <IO/WriteBufferFromHDFS.h>
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#include <IO/WriteHelpers.h>
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#include <IO/HDFSCommon.h>
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#include <Formats/FormatFactory.h>
#include <DataTypes/DataTypeString.h>
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#include <DataStreams/IBlockOutputStream.h>
#include <DataStreams/UnionBlockInputStream.h>
#include <DataStreams/OwningBlockInputStream.h>
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#include <DataStreams/IBlockInputStream.h>
#include <DataStreams/narrowBlockInputStreams.h>
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#include <Common/parseGlobs.h>
#include <Poco/URI.h>
#include <re2/re2.h>
#include <re2/stringpiece.h>
#include <hdfs/hdfs.h>
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namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int NOT_IMPLEMENTED;
extern const int BAD_ARGUMENTS;
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}
StorageHDFS::StorageHDFS(const String & uri_,
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const StorageID & table_id_,
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const String & format_name_,
const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
Context & context_,
const String & compression_method_ = "")
: IStorage(table_id_,
ColumnsDescription({
{"_path", std::make_shared<DataTypeString>()},
{"_file", std::make_shared<DataTypeString>()}
},
true /// all_virtuals
)
)
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, uri(uri_)
, format_name(format_name_)
, context(context_)
, compression_method(compression_method_)
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{
context.getRemoteHostFilter().checkURL(Poco::URI(uri));
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setColumns(columns_);
setConstraints(constraints_);
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}
namespace
{
class HDFSBlockInputStream : public IBlockInputStream
{
public:
HDFSBlockInputStream(const String & uri,
bool need_path,
bool need_file,
const String & format,
const Block & sample_block,
const Context & context,
UInt64 max_block_size,
const CompressionMethod compression_method)
{
auto read_buf = wrapReadBufferWithCompressionMethod(std::make_unique<ReadBufferFromHDFS>(uri), compression_method);
file_path = uri;
with_file_column = need_file;
with_path_column = need_path;
auto input_stream = FormatFactory::instance().getInput(format, *read_buf, sample_block, context, max_block_size);
reader = std::make_shared<OwningBlockInputStream<ReadBuffer>>(input_stream, std::move(read_buf));
}
String getName() const override
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{
return "HDFS";
}
Block readImpl() override
{
auto res = reader->read();
if (res)
{
if (with_path_column)
res.insert({DataTypeString().createColumnConst(res.rows(), file_path)->convertToFullColumnIfConst(), std::make_shared<DataTypeString>(),
"_path"}); /// construction with const is for probably generating less code
if (with_file_column)
{
size_t last_slash_pos = file_path.find_last_of('/');
res.insert({DataTypeString().createColumnConst(res.rows(), file_path.substr(
last_slash_pos + 1))->convertToFullColumnIfConst(), std::make_shared<DataTypeString>(),
"_file"});
}
}
return res;
}
Block getHeader() const override
{
auto res = reader->getHeader();
if (res)
{
if (with_path_column)
res.insert({DataTypeString().createColumn(), std::make_shared<DataTypeString>(), "_path"});
if (with_file_column)
res.insert({DataTypeString().createColumn(), std::make_shared<DataTypeString>(), "_file"});
}
return res;
}
void readPrefixImpl() override
{
reader->readPrefix();
}
void readSuffixImpl() override
{
reader->readSuffix();
}
private:
BlockInputStreamPtr reader;
String file_path;
bool with_path_column = false;
bool with_file_column = false;
};
class HDFSBlockOutputStream : public IBlockOutputStream
{
public:
HDFSBlockOutputStream(const String & uri,
const String & format,
const Block & sample_block_,
const Context & context,
const CompressionMethod compression_method)
: sample_block(sample_block_)
{
write_buf = wrapWriteBufferWithCompressionMethod(std::make_unique<WriteBufferFromHDFS>(uri), compression_method, 3);
writer = FormatFactory::instance().getOutput(format, *write_buf, sample_block, context);
}
Block getHeader() const override
{
return sample_block;
}
void write(const Block & block) override
{
writer->write(block);
}
void writePrefix() override
{
writer->writePrefix();
}
void writeSuffix() override
{
writer->writeSuffix();
writer->flush();
write_buf->sync();
}
private:
Block sample_block;
std::unique_ptr<WriteBuffer> write_buf;
BlockOutputStreamPtr writer;
};
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/* Recursive directory listing with matched paths as a result.
* Have the same method in StorageFile.
*/
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Strings LSWithRegexpMatching(const String & path_for_ls, const HDFSFSPtr & fs, const String & for_match)
{
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const size_t first_glob = for_match.find_first_of("*?{");
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const size_t end_of_path_without_globs = for_match.substr(0, first_glob).rfind('/');
const String suffix_with_globs = for_match.substr(end_of_path_without_globs); /// begin with '/'
const String prefix_without_globs = path_for_ls + for_match.substr(1, end_of_path_without_globs); /// ends with '/'
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const size_t next_slash = suffix_with_globs.find('/', 1);
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re2::RE2 matcher(makeRegexpPatternFromGlobs(suffix_with_globs.substr(0, next_slash)));
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HDFSFileInfo ls;
ls.file_info = hdfsListDirectory(fs.get(), prefix_without_globs.data(), &ls.length);
Strings result;
for (int i = 0; i < ls.length; ++i)
{
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const String full_path = String(ls.file_info[i].mName);
const size_t last_slash = full_path.rfind('/');
const String file_name = full_path.substr(last_slash);
const bool looking_for_directory = next_slash != std::string::npos;
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const bool is_directory = ls.file_info[i].mKind == 'D';
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/// Condition with type of current file_info means what kind of path is it in current iteration of ls
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if (!is_directory && !looking_for_directory)
{
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if (re2::RE2::FullMatch(file_name, matcher))
{
result.push_back(String(ls.file_info[i].mName));
}
}
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else if (is_directory && looking_for_directory)
{
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if (re2::RE2::FullMatch(file_name, matcher))
{
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Strings result_part = LSWithRegexpMatching(full_path + "/", fs, suffix_with_globs.substr(next_slash));
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/// Recursion depth is limited by pattern. '*' works only for depth = 1, for depth = 2 pattern path is '*/*'. So we do not need additional check.
std::move(result_part.begin(), result_part.end(), std::back_inserter(result));
}
}
}
return result;
}
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}
BlockInputStreams StorageHDFS::read(
const Names & column_names,
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const SelectQueryInfo & /*query_info*/,
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const Context & context_,
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QueryProcessingStage::Enum /*processed_stage*/,
size_t max_block_size,
unsigned num_streams)
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{
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const size_t begin_of_path = uri.find('/', uri.find("//") + 2);
const String path_from_uri = uri.substr(begin_of_path);
const String uri_without_path = uri.substr(0, begin_of_path);
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HDFSBuilderPtr builder = createHDFSBuilder(uri_without_path + "/");
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HDFSFSPtr fs = createHDFSFS(builder.get());
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const Strings res_paths = LSWithRegexpMatching("/", fs, path_from_uri);
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BlockInputStreams result;
bool need_path_column = false;
bool need_file_column = false;
for (const auto & column : column_names)
{
if (column == "_path")
need_path_column = true;
if (column == "_file")
need_file_column = true;
}
for (const auto & res_path : res_paths)
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{
result.push_back(std::make_shared<HDFSBlockInputStream>(uri_without_path + res_path, need_path_column, need_file_column, format_name, getSampleBlock(), context_,
max_block_size, chooseCompressionMethod(res_path, compression_method)));
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}
return narrowBlockInputStreams(result, num_streams);
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}
BlockOutputStreamPtr StorageHDFS::write(const ASTPtr & /*query*/, const Context & /*context*/)
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{
return std::make_shared<HDFSBlockOutputStream>(uri,
format_name,
getSampleBlock(),
context,
chooseCompressionMethod(uri, compression_method));
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}
void registerStorageHDFS(StorageFactory & factory)
{
factory.registerStorage("HDFS", [](const StorageFactory::Arguments & args)
{
ASTs & engine_args = args.engine_args;
if (engine_args.size() != 2 && engine_args.size() != 3)
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throw Exception(
"Storage HDFS requires 2 or 3 arguments: url, name of used format and optional compression method.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.local_context);
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String url = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
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engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
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String format_name = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
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String compression_method;
if (engine_args.size() == 3)
{
engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.local_context);
compression_method = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
} else compression_method = "auto";
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return StorageHDFS::create(url, args.table_id, format_name, args.columns, args.constraints, args.context, compression_method);
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});
}
}
#endif