[ACCUMULO-3313] Zookeeper does not start because of classpath.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Component/s: mini

Environment

Windows
Hadoop 2.5.0cdh5.2.0
Accumulo 1.6.0cdh5.1.0

• Assignee: Unassigned
• Reporter: Johannes Bauer
• Created: 07/Nov/14 12:25
• Updated: 23/Apr/19 00:11
• Resolved: 23/Apr/19 00:11

Description

When I run the MiniAccumuloCluster 1.6.0 on Windows, it does not start up correctly, but ends up with the error

java.lang.RuntimeException: Zookeeper did not start within 20 seconds. Check the logs in C:\Users\jsbaue\AppData\Local\Temp\1415364318664-0\logs for errors.  Last exception: java.net.ConnectException: Connection refused: connect
	at org.apache.accumulo.minicluster.impl.MiniAccumuloClusterImpl.start(MiniAccumuloClusterImpl.java:460)
	at org.apache.accumulo.minicluster.MiniAccumuloCluster.start(MiniAccumuloCluster.java:72)
	at com.gfk.st2.pace.datafactory.adaptor.accumulo.impl.MiniAccumuloClusterTest.testStart(MiniAccumuloClusterTest.java:50)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

Reason is, that Zookeeper does not startup at all, as the classpath, returned by the function

private String getClasspath() throws IOException

in MiniAccumuloClusterImpl.java returns a classpath, containing just the config directory. The reason for this is the part

        // assume 0 is the system classloader and skip it
        for (int i = 1; i < classloaders.size(); i++) {

(Line 208f in 1.6.0, 224f in 1.6.1), my debug-situation can be seen in screenshot-1.png. There you also can see, that the list classloaders includes only one classloader, which is a java.net.URLClassLoader. This classloader does not have a parent. Subsequently, the list has only one element, and the for-loop is never entered. So the classpath does not even contain the class org.apache.zookeeper.server.ZooKeeperServerMain, so Zeekeeper cannot be started.

When I start the loop with 0, zookeeper starts up and I can use the MiniAccumuloCluster.

Issue Links

• is related to: ACCUMULO-3380 MiniAccumuloCluster does not work with long classpath under Windows.