jetbrains.exodus.log.LogWarmup.kt Maven / Gradle / Ivy
/**
* Copyright 2010 - 2022 JetBrains s.r.o.
*
* Licensed 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
*
* https://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.
*/
package jetbrains.exodus.log
import jetbrains.exodus.core.execution.RunnableJob
import jetbrains.exodus.core.execution.executeIterable
import jetbrains.exodus.util.DeferredIO
import java.lang.Integer.max
/**
* Populates LogCache with file pages of this Log in historical order.
*/
internal fun Log.warmup() {
// do warmup asynchronously
val processor = DeferredIO.getJobProcessor()
processor.queue(RunnableJob {
// number of files to walk through at maximum
val maxFiles = cache.memoryUsage / fileLengthBound
val files = allFileAddresses.take(max(1, maxFiles.toInt())).reversed()
val size = files.size
val it = DataIterator(this)
val pageSize = config.cachePageSize
Log.logger.info("Warming LogCache up with newest $size ${if (size > 1) "files" else "file"} at $location")
processor.executeIterable(files) { address ->
Log.logger.info("Warming up ${LogUtil.getLogFilename(address)}")
var pageAddress = address
while (pageAddress < address + fileLengthBound && pageAddress + pageSize < highAddress) {
it.checkPage(pageAddress)
pageAddress += pageSize
}
}
})
}