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Posted to dev@kafka.apache.org by "Dmitry Bugaychenko (JIRA)" <ji...@apache.org> on 2014/04/23 14:38:15 UTC
[jira] [Created] (KAFKA-1414) Speedup broker startup after hard
reset
Dmitry Bugaychenko created KAFKA-1414:
-----------------------------------------
Summary: Speedup broker startup after hard reset
Key: KAFKA-1414
URL: https://issues.apache.org/jira/browse/KAFKA-1414
Project: Kafka
Issue Type: Improvement
Components: log
Affects Versions: 0.8.1
Reporter: Dmitry Bugaychenko
Assignee: Jay Kreps
After hard reset due to power failure broker takes way too much time recovering unflushed segments in a single thread. This could be easiliy improved launching multiple threads (one per data dirrectory, assuming that typically each data directory is on a dedicated drive). Localy we trie this simple patch to LogManager.loadLogs and it seems to work, however I'm too new to scala, so do not take it literally:
{code}
/**
* Recover and load all logs in the given data directories
*/
private def loadLogs(dirs: Seq[File]) {
val threads : Array[Thread] = new Array[Thread](dirs.size)
var i: Int = 0
val me = this
for(dir <- dirs) {
val thread = new Thread( new Runnable {
def run()
{
val recoveryPoints = me.recoveryPointCheckpoints(dir).read
/* load the logs */
val subDirs = dir.listFiles()
if(subDirs != null) {
val cleanShutDownFile = new File(dir, Log.CleanShutdownFile)
if(cleanShutDownFile.exists())
info("Found clean shutdown file. Skipping recovery for all logs in data directory '%s'".format(dir.getAbsolutePath))
for(dir <- subDirs) {
if(dir.isDirectory) {
info("Loading log '" + dir.getName + "'")
val topicPartition = Log.parseTopicPartitionName(dir.getName)
val config = topicConfigs.getOrElse(topicPartition.topic, defaultConfig)
val log = new Log(dir,
config,
recoveryPoints.getOrElse(topicPartition, 0L),
scheduler,
time)
val previous = addLogWithLock(topicPartition, log)
if(previous != null)
throw new IllegalArgumentException("Duplicate log directories found: %s, %s!".format(log.dir.getAbsolutePath, previous.dir.getAbsolutePath))
}
}
cleanShutDownFile.delete()
}
}
})
thread.start()
threads(i) = thread
i = i + 1
}
for(thread <- threads) {
thread.join()
}
}
def addLogWithLock(topicPartition: TopicAndPartition, log: Log): Log = {
logCreationOrDeletionLock synchronized {
this.logs.put(topicPartition, log)
}
}
{code}
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