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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Hints subsystem consists of several components.
*
* {@link org.apache.cassandra.hints.Hint} encodes all the required metadata and the mutation being hinted.
*
* {@link org.apache.cassandra.hints.HintsBuffer} provides a temporary buffer for writing the hints to in a concurrent manner,
* before we flush them to disk.
*
* {@link org.apache.cassandra.hints.HintsBufferPool} is responsible for submitting {@link org.apache.cassandra.hints.HintsBuffer}
* instances for flushing when they exceed their capacity, and for maitaining a reserve {@link org.apache.cassandra.hints.HintsBuffer}
* instance, and creating extra ones if flushing cannot keep up with arrival rate.
*
* {@link org.apache.cassandra.hints.HintsWriteExecutor} is a single-threaded executor that performs all the writing to disk.
*
* {@link org.apache.cassandra.hints.HintsDispatchExecutor} is a multi-threaded executor responsible for dispatch of
* the hints to their destinations.
*
* {@link org.apache.cassandra.hints.HintsStore} tracks the state of all hints files (written and being written to)
* for a given host id destination.
*
* {@link org.apache.cassandra.hints.HintsCatalog} maintains the mapping of host ids to {@link org.apache.cassandra.hints.HintsStore}
* instances, and provides some aggregate APIs.
*
* {@link org.apache.cassandra.hints.HintsService} wraps the catalog, the pool, and the two executors, acting as a front-end
* for hints.
*/
package org.apache.cassandra.hints;