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Merge branch 'master' into performance

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Conflicts:
	db/db_bench.cc
	util/options.cc
This commit is contained in:
Dhruba Borthakur
2012-10-29 14:18:00 -07:00
parent ea9e087851 321dfdc3ae
commit 53e04311b1
15 changed files with 396 additions and 44 deletions
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8
include/leveldb/env.h
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@@ -226,9 +226,9 @@ class WritableFile {
virtual Status Flush() = 0;
virtual Status Sync() = 0; // sync data
/*
/*
* Sync data and/or metadata as well.
* By default, sync only metadata.
* By default, sync only metadata.
* Override this method for environments where we need to sync
* metadata as well.
*/
@@ -252,11 +252,15 @@ class WritableFile {
// An interface for writing log messages.
class Logger {
public:
enum { DO_NOT_SUPPORT_GET_LOG_FILE_SIZE = -1 };
Logger() { }
virtual ~Logger();
// Write an entry to the log file with the specified format.
virtual void Logv(const char* format, va_list ap) = 0;
virtual size_t GetLogFileSize() const {
return DO_NOT_SUPPORT_GET_LOG_FILE_SIZE;
}
private:
// No copying allowed

25
include/leveldb/options.h
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@@ -141,6 +141,20 @@ struct Options {
// efficiently detect that and will switch to uncompressed mode.
CompressionType compression;
// Different levels can have different compression policies. There
// are cases where most lower levels would like to quick compression
// algorithm while the higher levels (which have more data) use
// compression algorithms that have better compression but could
// be slower. This array, if non NULL, should have an entry for
// each level of the database. This array, if non NULL, overides the
// value specified in the previous field 'compression'. The caller is
// reponsible for allocating memory and initializing the values in it
// before invoking Open(). The caller is responsible for freeing this
// array and it could be freed anytime after the return from Open().
// This could have been a std::vector but that makes the equivalent
// java/C api hard to construct.
CompressionType* compression_per_level;
// If non-NULL, use the specified filter policy to reduce disk reads.
// Many applications will benefit from passing the result of
// NewBloomFilterPolicy() here.
@@ -257,6 +271,17 @@ struct Options {
// Default: 1
int max_background_compactions;
// Specify the maximal size of the info log file. If the log file
// is larger than `max_log_file_size`, a new info log file will
// be created.
// If max_log_file_size == 0, all logs will be written to one
// log file.
size_t max_log_file_size;
// Puts are delayed when any level has a compaction score that
// exceeds rate_limit. This is ignored when <= 1.0.
double rate_limit;
// Create an Options object with default values for all fields.
Options();

7
include/leveldb/table_builder.h
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@@ -27,8 +27,10 @@ class TableBuilder {
public:
// Create a builder that will store the contents of the table it is
// building in *file. Does not close the file. It is up to the
// caller to close the file after calling Finish().
TableBuilder(const Options& options, WritableFile* file);
// caller to close the file after calling Finish(). The output file
// will be part of level specified by 'level'. A value of -1 means
// that the caller does not know which level the output file will reside.
TableBuilder(const Options& options, WritableFile* file, int level=-1);
// REQUIRES: Either Finish() or Abandon() has been called.
~TableBuilder();
@@ -81,6 +83,7 @@ class TableBuilder {
struct Rep;
Rep* rep_;
int level_;
// No copying allowed
TableBuilder(const TableBuilder&);