Revision d3d20dcdca9dc79d893a03dfa611fb1055c28f96 authored by Sagar Vemuri on 11 April 2019, 02:24:25 UTC, committed by Facebook Github Bot on 11 April 2019, 02:31:18 UTC
Summary: Introducing Periodic Compactions. This feature allows all the files in a CF to be periodically compacted. It could help in catching any corruptions that could creep into the DB proactively as every file is constantly getting re-compacted. And also, of course, it helps to cleanup data older than certain threshold. - Introduced a new option `periodic_compaction_time` to control how long a file can live without being compacted in a CF. - This works across all levels. - The files are put in the same level after going through the compaction. (Related files in the same level are picked up as `ExpandInputstoCleanCut` is used). - Compaction filters, if any, are invoked as usual. - A new table property, `file_creation_time`, is introduced to implement this feature. This property is set to the time at which the SST file was created (and that time is given by the underlying Env/OS). This feature can be enabled on its own, or in conjunction with `ttl`. It is possible to set a different time threshold for the bottom level when used in conjunction with ttl. Since `ttl` works only on 0 to last but one levels, you could set `ttl` to, say, 1 day, and `periodic_compaction_time` to, say, 7 days. Since `ttl < periodic_compaction_time` all files in last but one levels keep getting picked up based on ttl, and almost never based on periodic_compaction_time. The files in the bottom level get picked up for compaction based on `periodic_compaction_time`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5166 Differential Revision: D14884441 Pulled By: sagar0 fbshipit-source-id: 408426cbacb409c06386a98632dcf90bfa1bda47
1 parent ef0fc1b
wal_filter_jnicallback.h
// 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).
//
// This file implements the callback "bridge" between Java and C++ for
// rocksdb::WalFilter.
#ifndef JAVA_ROCKSJNI_WAL_FILTER_JNICALLBACK_H_
#define JAVA_ROCKSJNI_WAL_FILTER_JNICALLBACK_H_
#include <jni.h>
#include <map>
#include <memory>
#include <string>
#include "rocksdb/wal_filter.h"
#include "rocksjni/jnicallback.h"
namespace rocksdb {
class WalFilterJniCallback : public JniCallback, public WalFilter {
public:
WalFilterJniCallback(
JNIEnv* env, jobject jwal_filter);
virtual void ColumnFamilyLogNumberMap(
const std::map<uint32_t, uint64_t>& cf_lognumber_map,
const std::map<std::string, uint32_t>& cf_name_id_map);
virtual WalFilter::WalProcessingOption LogRecordFound(
unsigned long long log_number, const std::string& log_file_name,
const WriteBatch& batch, WriteBatch* new_batch, bool* batch_changed);
virtual const char* Name() const;
private:
std::unique_ptr<const char[]> m_name;
jmethodID m_column_family_log_number_map_mid;
jmethodID m_log_record_found_proxy_mid;
};
} //namespace rocksdb
#endif // JAVA_ROCKSJNI_WAL_FILTER_JNICALLBACK_H_
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