mirror of
https://github.com/facebook/rocksdb.git
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370 lines
11 KiB
C++
370 lines
11 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#pragma once
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#include <algorithm>
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#include <stdio.h>
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#include <time.h>
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#include <iostream>
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#include "port/sys_time.h"
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#include "rocksdb/env.h"
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#include "rocksdb/status.h"
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#ifdef USE_HDFS
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#include <hdfs.h>
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namespace rocksdb {
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// Thrown during execution when there is an issue with the supplied
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// arguments.
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class HdfsUsageException : public std::exception { };
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// A simple exception that indicates something went wrong that is not
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// recoverable. The intention is for the message to be printed (with
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// nothing else) and the process terminate.
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class HdfsFatalException : public std::exception {
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public:
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explicit HdfsFatalException(const std::string& s) : what_(s) { }
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virtual ~HdfsFatalException() throw() { }
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virtual const char* what() const throw() {
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return what_.c_str();
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}
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private:
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const std::string what_;
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};
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//
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// The HDFS environment for rocksdb. This class overrides all the
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// file/dir access methods and delegates the thread-mgmt methods to the
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// default posix environment.
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//
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class HdfsEnv : public Env {
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public:
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explicit HdfsEnv(const std::string& fsname) : fsname_(fsname) {
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posixEnv = Env::Default();
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fileSys_ = connectToPath(fsname_);
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}
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virtual ~HdfsEnv() {
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fprintf(stderr, "Destroying HdfsEnv::Default()\n");
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hdfsDisconnect(fileSys_);
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}
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virtual Status NewSequentialFile(const std::string& fname,
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std::unique_ptr<SequentialFile>* result,
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const EnvOptions& options);
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virtual Status NewRandomAccessFile(const std::string& fname,
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std::unique_ptr<RandomAccessFile>* result,
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const EnvOptions& options);
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virtual Status NewWritableFile(const std::string& fname,
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std::unique_ptr<WritableFile>* result,
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const EnvOptions& options);
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virtual Status NewDirectory(const std::string& name,
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std::unique_ptr<Directory>* result);
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virtual Status FileExists(const std::string& fname);
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virtual Status GetChildren(const std::string& path,
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std::vector<std::string>* result);
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virtual Status DeleteFile(const std::string& fname);
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virtual Status CreateDir(const std::string& name);
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virtual Status CreateDirIfMissing(const std::string& name);
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virtual Status DeleteDir(const std::string& name);
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virtual Status GetFileSize(const std::string& fname, uint64_t* size);
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virtual Status GetFileModificationTime(const std::string& fname,
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uint64_t* file_mtime);
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virtual Status RenameFile(const std::string& src, const std::string& target);
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virtual Status LinkFile(const std::string& src, const std::string& target) {
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return Status::NotSupported(); // not supported
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}
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virtual Status LockFile(const std::string& fname, FileLock** lock);
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virtual Status UnlockFile(FileLock* lock);
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virtual Status NewLogger(const std::string& fname,
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std::shared_ptr<Logger>* result);
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virtual void Schedule(void (*function)(void* arg), void* arg,
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Priority pri = LOW, void* tag = nullptr, void (*unschedFunction)(void* arg) = 0) {
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posixEnv->Schedule(function, arg, pri, tag, unschedFunction);
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}
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virtual int UnSchedule(void* tag, Priority pri) {
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return posixEnv->UnSchedule(tag, pri);
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}
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virtual void StartThread(void (*function)(void* arg), void* arg) {
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posixEnv->StartThread(function, arg);
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}
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virtual void WaitForJoin() { posixEnv->WaitForJoin(); }
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virtual unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const
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override {
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return posixEnv->GetThreadPoolQueueLen(pri);
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}
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virtual Status GetTestDirectory(std::string* path) {
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return posixEnv->GetTestDirectory(path);
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}
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virtual uint64_t NowMicros() {
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return posixEnv->NowMicros();
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}
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virtual void SleepForMicroseconds(int micros) {
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posixEnv->SleepForMicroseconds(micros);
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}
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virtual Status GetHostName(char* name, uint64_t len) {
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return posixEnv->GetHostName(name, len);
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}
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virtual Status GetCurrentTime(int64_t* unix_time) {
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return posixEnv->GetCurrentTime(unix_time);
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}
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virtual Status GetAbsolutePath(const std::string& db_path,
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std::string* output_path) {
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return posixEnv->GetAbsolutePath(db_path, output_path);
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}
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virtual void SetBackgroundThreads(int number, Priority pri = LOW) {
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posixEnv->SetBackgroundThreads(number, pri);
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}
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virtual void IncBackgroundThreadsIfNeeded(int number, Priority pri) override {
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posixEnv->IncBackgroundThreadsIfNeeded(number, pri);
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}
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virtual std::string TimeToString(uint64_t number) {
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return posixEnv->TimeToString(number);
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}
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static uint64_t gettid() {
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assert(sizeof(pthread_t) <= sizeof(uint64_t));
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return (uint64_t)pthread_self();
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}
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virtual uint64_t GetThreadID() const override {
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return HdfsEnv::gettid();
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}
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private:
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std::string fsname_; // string of the form "hdfs://hostname:port/"
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hdfsFS fileSys_; // a single FileSystem object for all files
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Env* posixEnv; // This object is derived from Env, but not from
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// posixEnv. We have posixnv as an encapsulated
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// object here so that we can use posix timers,
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// posix threads, etc.
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static const std::string kProto;
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static const std::string pathsep;
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/**
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* If the URI is specified of the form hdfs://server:port/path,
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* then connect to the specified cluster
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* else connect to default.
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*/
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hdfsFS connectToPath(const std::string& uri) {
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if (uri.empty()) {
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return nullptr;
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}
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if (uri.find(kProto) != 0) {
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// uri doesn't start with hdfs:// -> use default:0, which is special
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// to libhdfs.
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return hdfsConnectNewInstance("default", 0);
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}
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const std::string hostport = uri.substr(kProto.length());
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std::vector <std::string> parts;
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split(hostport, ':', parts);
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if (parts.size() != 2) {
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throw HdfsFatalException("Bad uri for hdfs " + uri);
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}
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// parts[0] = hosts, parts[1] = port/xxx/yyy
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std::string host(parts[0]);
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std::string remaining(parts[1]);
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int rem = remaining.find(pathsep);
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std::string portStr = (rem == 0 ? remaining :
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remaining.substr(0, rem));
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tPort port;
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port = atoi(portStr.c_str());
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if (port == 0) {
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throw HdfsFatalException("Bad host-port for hdfs " + uri);
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}
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hdfsFS fs = hdfsConnectNewInstance(host.c_str(), port);
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return fs;
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}
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void split(const std::string &s, char delim,
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std::vector<std::string> &elems) {
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elems.clear();
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size_t prev = 0;
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size_t pos = s.find(delim);
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while (pos != std::string::npos) {
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elems.push_back(s.substr(prev, pos));
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prev = pos + 1;
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pos = s.find(delim, prev);
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}
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elems.push_back(s.substr(prev, s.size()));
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}
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};
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} // namespace rocksdb
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#else // USE_HDFS
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namespace rocksdb {
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static const Status notsup;
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class HdfsEnv : public Env {
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public:
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explicit HdfsEnv(const std::string& fsname) {
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fprintf(stderr, "You have not build rocksdb with HDFS support\n");
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fprintf(stderr, "Please see hdfs/README for details\n");
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abort();
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}
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virtual ~HdfsEnv() {
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}
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virtual Status NewSequentialFile(const std::string& fname,
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unique_ptr<SequentialFile>* result,
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const EnvOptions& options) override;
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virtual Status NewRandomAccessFile(const std::string& fname,
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unique_ptr<RandomAccessFile>* result,
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const EnvOptions& options) override {
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return notsup;
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}
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virtual Status NewWritableFile(const std::string& fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options) override {
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return notsup;
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}
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virtual Status NewDirectory(const std::string& name,
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unique_ptr<Directory>* result) override {
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return notsup;
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}
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virtual Status FileExists(const std::string& fname) override {
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return notsup;
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}
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virtual Status GetChildren(const std::string& path,
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std::vector<std::string>* result) override {
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return notsup;
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}
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virtual Status DeleteFile(const std::string& fname) override {
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return notsup;
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}
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virtual Status CreateDir(const std::string& name) override { return notsup; }
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virtual Status CreateDirIfMissing(const std::string& name) override {
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return notsup;
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}
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virtual Status DeleteDir(const std::string& name) override { return notsup; }
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virtual Status GetFileSize(const std::string& fname,
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uint64_t* size) override {
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return notsup;
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}
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virtual Status GetFileModificationTime(const std::string& fname,
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uint64_t* time) override {
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return notsup;
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}
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virtual Status RenameFile(const std::string& src,
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const std::string& target) override {
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return notsup;
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}
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virtual Status LinkFile(const std::string& src,
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const std::string& target) override {
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return notsup;
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}
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virtual Status LockFile(const std::string& fname, FileLock** lock) override {
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return notsup;
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}
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virtual Status UnlockFile(FileLock* lock) override { return notsup; }
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virtual Status NewLogger(const std::string& fname,
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shared_ptr<Logger>* result) override {
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return notsup;
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}
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virtual void Schedule(void (*function)(void* arg), void* arg,
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Priority pri = LOW, void* tag = nullptr,
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void (*unschedFunction)(void* arg) = 0) override {}
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virtual int UnSchedule(void* tag, Priority pri) override { return 0; }
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virtual void StartThread(void (*function)(void* arg), void* arg) override {}
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virtual void WaitForJoin() override {}
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virtual unsigned int GetThreadPoolQueueLen(
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Priority pri = LOW) const override {
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return 0;
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}
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virtual Status GetTestDirectory(std::string* path) override { return notsup; }
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virtual uint64_t NowMicros() override { return 0; }
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virtual void SleepForMicroseconds(int micros) override {}
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virtual Status GetHostName(char* name, uint64_t len) override {
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return notsup;
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}
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virtual Status GetCurrentTime(int64_t* unix_time) override { return notsup; }
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virtual Status GetAbsolutePath(const std::string& db_path,
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std::string* outputpath) override {
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return notsup;
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}
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virtual void SetBackgroundThreads(int number, Priority pri = LOW) override {}
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virtual void IncBackgroundThreadsIfNeeded(int number, Priority pri) override {
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}
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virtual std::string TimeToString(uint64_t number) override { return ""; }
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virtual uint64_t GetThreadID() const override {
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return 0;
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}
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};
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}
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#endif // USE_HDFS
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