ZOOKEEPER-3620 Allow to override calls to System.exit in server side code

excludeFindBugsFilter.xml

@@ -7,8 +7,5 @@
     <!-- this problem is to be addressed in ZOOKEEPER-3227 -->
     <Bug pattern="DM_DEFAULT_ENCODING"/>
 
-    <!-- not really a problem -->
-    <Bug pattern="DM_EXIT"/>
-
 </FindBugsFilter>
 

zookeeper-server/src/main/java/org/apache/zookeeper/Version.java

@@ -20,6 +20,7 @@
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import org.apache.zookeeper.server.ExitCode;
+import org.apache.zookeeper.util.ServiceUtils;
 
 public class Version implements org.apache.zookeeper.version.Info {
 
@@ -48,7 +49,7 @@ public static void printUsage() {
         System.out.print("Usage:\tjava -cp ... org.apache.zookeeper.Version "
                          + "[--full | --short | --revision],\n\tPrints --full version "
                          + "info if no arg specified.");
-        System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+        ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
     }
 
     /**
@@ -68,7 +69,7 @@ public static void main(String[] args) {
         }
         if (args.length == 0 || (args.length == 1 && args[0].equals("--full"))) {
             System.out.println(getFullVersion());
-            System.exit(ExitCode.EXECUTION_FINISHED.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.EXECUTION_FINISHED.getValue());
         }
         if (args[0].equals("--short")) {
             System.out.println(getVersion());
@@ -77,7 +78,7 @@ public static void main(String[] args) {
         } else {
             printUsage();
         }
-        System.exit(ExitCode.EXECUTION_FINISHED.getValue());
+        ServiceUtils.requestSystemExit(ExitCode.EXECUTION_FINISHED.getValue());
     }
 
 }

zookeeper-server/src/main/java/org/apache/zookeeper/ZooKeeperMain.java

@@ -66,6 +66,7 @@
 import org.apache.zookeeper.cli.VersionCommand;
 import org.apache.zookeeper.client.ZKClientConfig;
 import org.apache.zookeeper.server.ExitCode;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -353,7 +354,7 @@ void run() throws CliException, IOException, InterruptedException {
             // Command line args non-null.  Run what was passed.
             processCmd(cl);
         }
-        System.exit(exitCode);
+        ServiceUtils.requestSystemExit(exitCode);
     }
 
     public void executeLine(String line) throws CliException, InterruptedException, IOException {
@@ -396,7 +397,7 @@ protected boolean processZKCmd(MyCommandOptions co) throws CliException, IOExcep
 
         if (cmd.equals("quit")) {
             zk.close();
-            System.exit(exitCode);
+            ServiceUtils.requestSystemExit(exitCode);
         } else if (cmd.equals("redo") && args.length >= 2) {
             Integer i = Integer.decode(args[1]);
             if (commandCount <= i || i < 0) { // don't allow redoing this redo

zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java

@@ -78,6 +78,7 @@
 import org.apache.zookeeper.txn.SetDataTxn;
 import org.apache.zookeeper.txn.Txn;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -301,7 +302,7 @@ public DataTree() {
             childWatches = WatchManagerFactory.createWatchManager();
         } catch (Exception e) {
             LOG.error("Unexpected exception when creating WatchManager, exiting abnormally", e);
-            System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
         }
     }
 

zookeeper-server/src/main/java/org/apache/zookeeper/server/LogFormatter.java

@@ -33,6 +33,7 @@
 import org.apache.zookeeper.server.persistence.FileTxnLog;
 import org.apache.zookeeper.server.util.SerializeUtils;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -51,13 +52,13 @@ public class LogFormatter {
     public static void main(String[] args) throws Exception {
         if (args.length != 1) {
             System.err.println("USAGE: LogFormatter log_file");
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
 
         String error = ZKUtil.validateFileInput(args[0]);
         if (null != error) {
             System.err.println(error);
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
 
         FileInputStream fis = new FileInputStream(args[0]);
@@ -67,7 +68,7 @@ public static void main(String[] args) throws Exception {
 
         if (fhdr.getMagic() != FileTxnLog.TXNLOG_MAGIC) {
             System.err.println("Invalid magic number for " + args[0]);
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
         System.out.println("ZooKeeper Transactional Log File with dbid "
                            + fhdr.getDbid()

zookeeper-server/src/main/java/org/apache/zookeeper/server/PurgeTxnLog.java

@@ -30,6 +30,7 @@
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
 import org.apache.zookeeper.server.persistence.Util;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -230,7 +231,7 @@ private static int validateAndGetCount(String number) {
 
     private static void printUsageThenExit() {
         printUsage();
-        System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+        ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
     }
 
 }

zookeeper-server/src/main/java/org/apache/zookeeper/server/RequestThrottler.java

@@ -20,6 +20,7 @@
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.util.concurrent.LinkedBlockingQueue;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -257,7 +258,7 @@ public void shutdown() {
         } catch (InterruptedException e) {
             LOG.warn("Interrupted while waiting for {} to finish", this);
             //TODO apply ZOOKEEPER-575 and remove this line.
-            System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
         }
     }
 

zookeeper-server/src/main/java/org/apache/zookeeper/server/SnapshotFormatter.java

@@ -35,6 +35,7 @@
 import org.apache.zookeeper.server.persistence.FileSnap;
 import org.apache.zookeeper.server.persistence.SnapStream;
 import org.apache.zookeeper.server.persistence.Util;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.json.simple.JSONValue;
 
 /**
@@ -72,18 +73,19 @@ public static void main(String[] args) throws Exception {
             System.err.println("USAGE: SnapshotFormatter [-d|-json] snapshot_file");
             System.err.println("       -d dump the data for each znode");
             System.err.println("       -json dump znode info in json format");
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
+            return;
         }
 
         String error = ZKUtil.validateFileInput(snapshotFile);
         if (null != error) {
             System.err.println(error);
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
 
         if (dumpData && dumpJson) {
             System.err.println("Cannot specify both data dump (-d) and json mode (-json) in same call");
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
 
         new SnapshotFormatter().run(snapshotFile, dumpData, dumpJson);

zookeeper-server/src/main/java/org/apache/zookeeper/server/TraceFormatter.java

@@ -25,6 +25,7 @@
 import java.text.DateFormat;
 import java.util.Date;
 import org.apache.zookeeper.ZooDefs.OpCode;
+import org.apache.zookeeper.util.ServiceUtils;
 
 public class TraceFormatter {
 
@@ -35,7 +36,7 @@ public class TraceFormatter {
     public static void main(String[] args) throws IOException {
         if (args.length != 1) {
             System.err.println("USAGE: TraceFormatter trace_file");
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         }
         FileChannel fc = new FileInputStream(args[0]).getChannel();
         while (true) {

zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServer.java

@@ -80,6 +80,7 @@
 import org.apache.zookeeper.server.util.RequestPathMetricsCollector;
 import org.apache.zookeeper.txn.CreateSessionTxn;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -501,7 +502,7 @@ public void takeSnapshot(boolean syncSnap) {
             LOG.error("Severe unrecoverable error, exiting", e);
             // This is a severe error that we cannot recover from,
             // so we need to exit
-            System.exit(ExitCode.TXNLOG_ERROR_TAKING_SNAPSHOT.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.TXNLOG_ERROR_TAKING_SNAPSHOT.getValue());
         }
         long elapsed = Time.currentElapsedTime() - start;
         LOG.info("Snapshot taken in {} ms", elapsed);

zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServerMain.java

@@ -35,6 +35,7 @@
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog.DatadirException;
 import org.apache.zookeeper.server.quorum.QuorumPeerConfig.ConfigException;
 import org.apache.zookeeper.server.util.JvmPauseMonitor;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -69,29 +70,29 @@ public static void main(String[] args) {
             LOG.info(USAGE);
             System.err.println(USAGE);
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         } catch (ConfigException e) {
             LOG.error("Invalid config, exiting abnormally", e);
             System.err.println("Invalid config, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         } catch (DatadirException e) {
             LOG.error("Unable to access datadir, exiting abnormally", e);
             System.err.println("Unable to access datadir, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.UNABLE_TO_ACCESS_DATADIR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNABLE_TO_ACCESS_DATADIR.getValue());
         } catch (AdminServerException e) {
             LOG.error("Unable to start AdminServer, exiting abnormally", e);
             System.err.println("Unable to start AdminServer, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.ERROR_STARTING_ADMIN_SERVER.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.ERROR_STARTING_ADMIN_SERVER.getValue());
         } catch (Exception e) {
             LOG.error("Unexpected exception, exiting abnormally", e);
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
         }
         LOG.info("Exiting normally");
-        System.exit(ExitCode.EXECUTION_FINISHED.getValue());
+        ServiceUtils.requestSystemExit(ExitCode.EXECUTION_FINISHED.getValue());
     }
 
     protected void initializeAndRun(String[] args) throws ConfigException, IOException, AdminServerException {

zookeeper-server/src/main/java/org/apache/zookeeper/server/persistence/TxnLogToolkit.java

@@ -58,6 +58,7 @@
 import org.apache.zookeeper.txn.SetDataTxn;
 import org.apache.zookeeper.txn.Txn;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 
 public class TxnLogToolkit implements Closeable {
 
@@ -126,7 +127,7 @@ public static void main(String[] args) throws Exception {
             printHelpAndExit(e.getExitCode(), e.getOptions());
         } catch (TxnLogToolkitException e) {
             System.err.println(e.getMessage());
-            System.exit(e.getExitCode());
+            ServiceUtils.requestSystemExit(e.getExitCode());
         }
     }
 
@@ -424,7 +425,7 @@ private static TxnLogToolkit parseCommandLine(String[] args) throws TxnLogToolki
     private static void printHelpAndExit(int exitCode, Options options) {
         HelpFormatter help = new HelpFormatter();
         help.printHelp(120, "TxnLogToolkit [-dhrvc] <txn_log_file_name> (-z <zxid>)", "", options, "");
-        System.exit(exitCode);
+        ServiceUtils.requestSystemExit(exitCode);
     }
 
     private void printStat() {

zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/FollowerZooKeeperServer.java

@@ -34,6 +34,7 @@
 import org.apache.zookeeper.server.ZKDatabase;
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -100,7 +101,7 @@ public void commit(long zxid) {
         if (firstElementZxid != zxid) {
             LOG.error("Committing zxid 0x" + Long.toHexString(zxid)
                       + " but next pending txn 0x" + Long.toHexString(firstElementZxid));
-            System.exit(ExitCode.UNMATCHED_TXN_COMMIT.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNMATCHED_TXN_COMMIT.getValue());
         }
         Request request = pendingTxns.remove();
         request.logLatency(ServerMetrics.getMetrics().COMMIT_PROPAGATION_LATENCY);

zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java

@@ -52,6 +52,7 @@
 import org.apache.zookeeper.server.util.ZxidUtils;
 import org.apache.zookeeper.txn.SetDataTxn;
 import org.apache.zookeeper.txn.TxnHeader;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -455,14 +456,13 @@ protected void syncWithLeader(long newLeaderZxid) throws Exception {
                 if (!truncated) {
                     // not able to truncate the log
                     LOG.error("Not able to truncate the log 0x{}", Long.toHexString(qp.getZxid()));
-                    System.exit(ExitCode.QUORUM_PACKET_ERROR.getValue());
+                    ServiceUtils.requestSystemExit(ExitCode.QUORUM_PACKET_ERROR.getValue());
                 }
                 zk.getZKDatabase().setlastProcessedZxid(qp.getZxid());
 
             } else {
                 LOG.error("Got unexpected packet from leader: {}, exiting ... ", LearnerHandler.packetToString(qp));
-                System.exit(ExitCode.QUORUM_PACKET_ERROR.getValue());
-
+                ServiceUtils.requestSystemExit(ExitCode.QUORUM_PACKET_ERROR.getValue());
             }
             zk.getZKDatabase().initConfigInZKDatabase(self.getQuorumVerifier());
             zk.createSessionTracker();

zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java

@@ -55,6 +55,7 @@
 import org.apache.zookeeper.server.quorum.flexible.QuorumVerifier;
 import org.apache.zookeeper.server.util.ConfigUtils;
 import org.apache.zookeeper.util.CircularBlockingQueue;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -825,7 +826,7 @@ public class Listener extends ZooKeeperThread {
         private static final int DEFAULT_PORT_BIND_MAX_RETRY = 3;
 
         private final int portBindMaxRetry;
-        private Runnable socketBindErrorHandler = () -> System.exit(ExitCode.UNABLE_TO_BIND_QUORUM_PORT.getValue());
+        private Runnable socketBindErrorHandler = () -> ServiceUtils.requestSystemExit(ExitCode.UNABLE_TO_BIND_QUORUM_PORT.getValue());
         volatile ServerSocket ss = null;
 
         public Listener() {

zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerMain.java

@@ -38,6 +38,7 @@
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog.DatadirException;
 import org.apache.zookeeper.server.quorum.QuorumPeerConfig.ConfigException;
 import org.apache.zookeeper.server.util.JvmPauseMonitor;
+import org.apache.zookeeper.util.ServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -92,29 +93,29 @@ public static void main(String[] args) {
             LOG.info(USAGE);
             System.err.println(USAGE);
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         } catch (ConfigException e) {
             LOG.error("Invalid config, exiting abnormally", e);
             System.err.println("Invalid config, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.INVALID_INVOCATION.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.INVALID_INVOCATION.getValue());
         } catch (DatadirException e) {
             LOG.error("Unable to access datadir, exiting abnormally", e);
             System.err.println("Unable to access datadir, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.UNABLE_TO_ACCESS_DATADIR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNABLE_TO_ACCESS_DATADIR.getValue());
         } catch (AdminServerException e) {
             LOG.error("Unable to start AdminServer, exiting abnormally", e);
             System.err.println("Unable to start AdminServer, exiting abnormally");
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.ERROR_STARTING_ADMIN_SERVER.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.ERROR_STARTING_ADMIN_SERVER.getValue());
         } catch (Exception e) {
             LOG.error("Unexpected exception, exiting abnormally", e);
             ZKAuditProvider.addServerStartFailureAuditLog();
-            System.exit(ExitCode.UNEXPECTED_ERROR.getValue());
+            ServiceUtils.requestSystemExit(ExitCode.UNEXPECTED_ERROR.getValue());
         }
         LOG.info("Exiting normally");
-        System.exit(ExitCode.EXECUTION_FINISHED.getValue());
+        ServiceUtils.requestSystemExit(ExitCode.EXECUTION_FINISHED.getValue());
     }
 
     protected void initializeAndRun(String[] args) throws ConfigException, IOException, AdminServerException {