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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.zookeeper;
import com.yahoo.protect.Process;
import org.apache.zookeeper.server.admin.AdminServer;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
import org.apache.zookeeper.server.quorum.QuorumPeerMain;
import java.io.IOException;
import java.nio.file.Path;
import java.time.Duration;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Starts or stops a ZooKeeper server. Extends QuorumPeerMain to be able to call initializeAndRun() and wraps
* exceptions so that it can be used by code that does not depend on ZooKeeper.
*
* @author hmusum
*/
class VespaQuorumPeer extends QuorumPeerMain implements QuorumPeer {
private static final Logger log = java.util.logging.Logger.getLogger(VespaQuorumPeer.class.getName());
@Override
public void start(Path path) {
initializeAndRun(new String[]{ path.toFile().getAbsolutePath()});
}
@Override
public void shutdown(Duration timeout) {
if (quorumPeer != null) {
log.log(Level.FINE, "Shutting down ZooKeeper server");
try {
quorumPeer.shutdown();
quorumPeer.join(timeout.toMillis()); // Wait for shutdown to complete
if (quorumPeer.isAlive())
throw new IllegalStateException("Peer still alive after " + timeout);
} catch (RuntimeException | InterruptedException e) {
// If shutdown fails, we have no other option than forcing the JVM to stop and letting it be restarted.
//
// When a VespaZooKeeperServer component receives a new config, the container will try to start a new
// server with the new config, this will fail until the old server is deconstructed. If the old server
// fails to deconstruct/shutdown, the new one will never start and if that happens forcing a restart is
// the better option.
Process.logAndDie("Failed to shut down ZooKeeper server properly, forcing shutdown", e);
}
}
}
@Override
protected void initializeAndRun(String[] args) {
try {
super.initializeAndRun(args);
} catch (QuorumPeerConfig.ConfigException | IOException | AdminServer.AdminServerException e) {
throw new RuntimeException("Exception when initializing or running ZooKeeper server", e);
}
}
}
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