1 files changed, 384 insertions, 0 deletions
diff --git a/src/rocksdb/hdfs/env_hdfs.h b/src/rocksdb/hdfs/env_hdfs.h
new file mode 100644
index 000000000..6005c3664
--- /dev/null
+++ b/src/rocksdb/hdfs/env_hdfs.h
@@ -0,0 +1,384 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+//
+
+#pragma once
+#include <algorithm>
+#include <stdio.h>
+#include <time.h>
+#include <iostream>
+#include "port/sys_time.h"
+#include "rocksdb/env.h"
+#include "rocksdb/status.h"
+
+#ifdef USE_HDFS
+#include <hdfs.h>
+
+namespace ROCKSDB_NAMESPACE {
+
+// Thrown during execution when there is an issue with the supplied
+// arguments.
+class HdfsUsageException : public std::exception { };
+
+// A simple exception that indicates something went wrong that is not
+// recoverable.  The intention is for the message to be printed (with
+// nothing else) and the process terminate.
+class HdfsFatalException : public std::exception {
+public:
+  explicit HdfsFatalException(const std::string& s) : what_(s) { }
+  virtual ~HdfsFatalException() throw() { }
+  virtual const char* what() const throw() {
+    return what_.c_str();
+  }
+private:
+  const std::string what_;
+};
+
+//
+// The HDFS environment for rocksdb. This class overrides all the
+// file/dir access methods and delegates the thread-mgmt methods to the
+// default posix environment.
+//
+class HdfsEnv : public Env {
+
+ public:
+  explicit HdfsEnv(const std::string& fsname) : fsname_(fsname) {
+    posixEnv = Env::Default();
+    fileSys_ = connectToPath(fsname_);
+  }
+
+  virtual ~HdfsEnv() {
+    fprintf(stderr, "Destroying HdfsEnv::Default()\n");
+    hdfsDisconnect(fileSys_);
+  }
+
+  Status NewSequentialFile(const std::string& fname,
+                           std::unique_ptr<SequentialFile>* result,
+                           const EnvOptions& options) override;
+
+  Status NewRandomAccessFile(const std::string& fname,
+                             std::unique_ptr<RandomAccessFile>* result,
+                             const EnvOptions& options) override;
+
+  Status NewWritableFile(const std::string& fname,
+                         std::unique_ptr<WritableFile>* result,
+                         const EnvOptions& options) override;
+
+  Status NewDirectory(const std::string& name,
+                      std::unique_ptr<Directory>* result) override;
+
+  Status FileExists(const std::string& fname) override;
+
+  Status GetChildren(const std::string& path,
+                     std::vector<std::string>* result) override;
+
+  Status DeleteFile(const std::string& fname) override;
+
+  Status CreateDir(const std::string& name) override;
+
+  Status CreateDirIfMissing(const std::string& name) override;
+
+  Status DeleteDir(const std::string& name) override;
+
+  Status GetFileSize(const std::string& fname, uint64_t* size) override;
+
+  Status GetFileModificationTime(const std::string& fname,
+                                 uint64_t* file_mtime) override;
+
+  Status RenameFile(const std::string& src, const std::string& target) override;
+
+  Status LinkFile(const std::string& /*src*/,
+                  const std::string& /*target*/) override {
+    return Status::NotSupported(); // not supported
+  }
+
+  Status LockFile(const std::string& fname, FileLock** lock) override;
+
+  Status UnlockFile(FileLock* lock) override;
+
+  Status NewLogger(const std::string& fname,
+                   std::shared_ptr<Logger>* result) override;
+
+  void Schedule(void (*function)(void* arg), void* arg, Priority pri = LOW,
+                void* tag = nullptr,
+                void (*unschedFunction)(void* arg) = 0) override {
+    posixEnv->Schedule(function, arg, pri, tag, unschedFunction);
+  }
+
+  int UnSchedule(void* tag, Priority pri) override {
+    return posixEnv->UnSchedule(tag, pri);
+  }
+
+  void StartThread(void (*function)(void* arg), void* arg) override {
+    posixEnv->StartThread(function, arg);
+  }
+
+  void WaitForJoin() override { posixEnv->WaitForJoin(); }
+
+  unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override {
+    return posixEnv->GetThreadPoolQueueLen(pri);
+  }
+
+  Status GetTestDirectory(std::string* path) override {
+    return posixEnv->GetTestDirectory(path);
+  }
+
+  uint64_t NowMicros() override { return posixEnv->NowMicros(); }
+
+  void SleepForMicroseconds(int micros) override {
+    posixEnv->SleepForMicroseconds(micros);
+  }
+
+  Status GetHostName(char* name, uint64_t len) override {
+    return posixEnv->GetHostName(name, len);
+  }
+
+  Status GetCurrentTime(int64_t* unix_time) override {
+    return posixEnv->GetCurrentTime(unix_time);
+  }
+
+  Status GetAbsolutePath(const std::string& db_path,
+                         std::string* output_path) override {
+    return posixEnv->GetAbsolutePath(db_path, output_path);
+  }
+
+  void SetBackgroundThreads(int number, Priority pri = LOW) override {
+    posixEnv->SetBackgroundThreads(number, pri);
+  }
+
+  int GetBackgroundThreads(Priority pri = LOW) override {
+    return posixEnv->GetBackgroundThreads(pri);
+  }
+
+  void IncBackgroundThreadsIfNeeded(int number, Priority pri) override {
+    posixEnv->IncBackgroundThreadsIfNeeded(number, pri);
+  }
+
+  std::string TimeToString(uint64_t number) override {
+    return posixEnv->TimeToString(number);
+  }
+
+  static uint64_t gettid() {
+    assert(sizeof(pthread_t) <= sizeof(uint64_t));
+    return (uint64_t)pthread_self();
+  }
+
+  uint64_t GetThreadID() const override { return HdfsEnv::gettid(); }
+
+ private:
+  std::string fsname_;  // string of the form "hdfs://hostname:port/"
+  hdfsFS fileSys_;      //  a single FileSystem object for all files
+  Env*  posixEnv;       // This object is derived from Env, but not from
+                        // posixEnv. We have posixnv as an encapsulated
+                        // object here so that we can use posix timers,
+                        // posix threads, etc.
+
+  static const std::string kProto;
+  static const std::string pathsep;
+
+  /**
+   * If the URI is specified of the form hdfs://server:port/path,
+   * then connect to the specified cluster
+   * else connect to default.
+   */
+  hdfsFS connectToPath(const std::string& uri) {
+    if (uri.empty()) {
+      return nullptr;
+    }
+    if (uri.find(kProto) != 0) {
+      // uri doesn't start with hdfs:// -> use default:0, which is special
+      // to libhdfs.
+      return hdfsConnectNewInstance("default", 0);
+    }
+    const std::string hostport = uri.substr(kProto.length());
+
+    std::vector <std::string> parts;
+    split(hostport, ':', parts);
+    if (parts.size() != 2) {
+      throw HdfsFatalException("Bad uri for hdfs " + uri);
+    }
+    // parts[0] = hosts, parts[1] = port/xxx/yyy
+    std::string host(parts[0]);
+    std::string remaining(parts[1]);
+
+    int rem = static_cast<int>(remaining.find(pathsep));
+    std::string portStr = (rem == 0 ? remaining :
+                           remaining.substr(0, rem));
+
+    tPort port;
+    port = atoi(portStr.c_str());
+    if (port == 0) {
+      throw HdfsFatalException("Bad host-port for hdfs " + uri);
+    }
+    hdfsFS fs = hdfsConnectNewInstance(host.c_str(), port);
+    return fs;
+  }
+
+  void split(const std::string &s, char delim,
+             std::vector<std::string> &elems) {
+    elems.clear();
+    size_t prev = 0;
+    size_t pos = s.find(delim);
+    while (pos != std::string::npos) {
+      elems.push_back(s.substr(prev, pos));
+      prev = pos + 1;
+      pos = s.find(delim, prev);
+    }
+    elems.push_back(s.substr(prev, s.size()));
+  }
+};
+
+}  // namespace ROCKSDB_NAMESPACE
+
+#else // USE_HDFS
+
+namespace ROCKSDB_NAMESPACE {
+
+static const Status notsup;
+
+class HdfsEnv : public Env {
+
+ public:
+  explicit HdfsEnv(const std::string& /*fsname*/) {
+    fprintf(stderr, "You have not build rocksdb with HDFS support\n");
+    fprintf(stderr, "Please see hdfs/README for details\n");
+    abort();
+  }
+
+  virtual ~HdfsEnv() {
+  }
+
+  virtual Status NewSequentialFile(const std::string& fname,
+                                   std::unique_ptr<SequentialFile>* result,
+                                   const EnvOptions& options) override;
+
+  virtual Status NewRandomAccessFile(
+      const std::string& /*fname*/,
+      std::unique_ptr<RandomAccessFile>* /*result*/,
+      const EnvOptions& /*options*/) override {
+    return notsup;
+  }
+
+  virtual Status NewWritableFile(const std::string& /*fname*/,
+                                 std::unique_ptr<WritableFile>* /*result*/,
+                                 const EnvOptions& /*options*/) override {
+    return notsup;
+  }
+
+  virtual Status NewDirectory(const std::string& /*name*/,
+                              std::unique_ptr<Directory>* /*result*/) override {
+    return notsup;
+  }
+
+  virtual Status FileExists(const std::string& /*fname*/) override {
+    return notsup;
+  }
+
+  virtual Status GetChildren(const std::string& /*path*/,
+                             std::vector<std::string>* /*result*/) override {
+    return notsup;
+  }
+
+  virtual Status DeleteFile(const std::string& /*fname*/) override {
+    return notsup;
+  }
+
+  virtual Status CreateDir(const std::string& /*name*/) override {
+    return notsup;
+  }
+
+  virtual Status CreateDirIfMissing(const std::string& /*name*/) override {
+    return notsup;
+  }
+
+  virtual Status DeleteDir(const std::string& /*name*/) override {
+    return notsup;
+  }
+
+  virtual Status GetFileSize(const std::string& /*fname*/,
+                             uint64_t* /*size*/) override {
+    return notsup;
+  }
+
+  virtual Status GetFileModificationTime(const std::string& /*fname*/,
+                                         uint64_t* /*time*/) override {
+    return notsup;
+  }
+
+  virtual Status RenameFile(const std::string& /*src*/,
+                            const std::string& /*target*/) override {
+    return notsup;
+  }
+
+  virtual Status LinkFile(const std::string& /*src*/,
+                          const std::string& /*target*/) override {
+    return notsup;
+  }
+
+  virtual Status LockFile(const std::string& /*fname*/,
+                          FileLock** /*lock*/) override {
+    return notsup;
+  }
+
+  virtual Status UnlockFile(FileLock* /*lock*/) override { return notsup; }
+
+  virtual Status NewLogger(const std::string& /*fname*/,
+                           std::shared_ptr<Logger>* /*result*/) override {
+    return notsup;
+  }
+
+  virtual void Schedule(void (* /*function*/)(void* arg), void* /*arg*/,
+                        Priority /*pri*/ = LOW, void* /*tag*/ = nullptr,
+                        void (* /*unschedFunction*/)(void* arg) = 0) override {}
+
+  virtual int UnSchedule(void* /*tag*/, Priority /*pri*/) override { return 0; }
+
+  virtual void StartThread(void (* /*function*/)(void* arg),
+                           void* /*arg*/) override {}
+
+  virtual void WaitForJoin() override {}
+
+  virtual unsigned int GetThreadPoolQueueLen(
+      Priority /*pri*/ = LOW) const override {
+    return 0;
+  }
+
+  virtual Status GetTestDirectory(std::string* /*path*/) override {
+    return notsup;
+  }
+
+  virtual uint64_t NowMicros() override { return 0; }
+
+  virtual void SleepForMicroseconds(int /*micros*/) override {}
+
+  virtual Status GetHostName(char* /*name*/, uint64_t /*len*/) override {
+    return notsup;
+  }
+
+  virtual Status GetCurrentTime(int64_t* /*unix_time*/) override {
+    return notsup;
+  }
+
+  virtual Status GetAbsolutePath(const std::string& /*db_path*/,
+                                 std::string* /*outputpath*/) override {
+    return notsup;
+  }
+
+  virtual void SetBackgroundThreads(int /*number*/,
+                                    Priority /*pri*/ = LOW) override {}
+  virtual int GetBackgroundThreads(Priority /*pri*/ = LOW) override {
+    return 0;
+  }
+  virtual void IncBackgroundThreadsIfNeeded(int /*number*/,
+                                            Priority /*pri*/) override {}
+  virtual std::string TimeToString(uint64_t /*number*/) override { return ""; }
+
+  virtual uint64_t GetThreadID() const override {
+    return 0;
+  }
+};
+}  // namespace ROCKSDB_NAMESPACE
+
+#endif // USE_HDFS