Change Fragment and Foreman state and cancellation to use full synchronous acknowledgement

#Tue Dec 02 14:38:34 EST 2014
git.commit.id.abbrev=757e9a2

While running Mondrian query, saw lots of the following exception in drillbit.log, queries were successful:

2014-12-02 14:30:42,940 [2b81c26d-4109-6df8-018b-c32616ca359c:frag:0:0] INFO o.a.drill.exec.work.foreman.Foreman - Dropping request to move to COMPLETED state as query is already at FAILED state (which is terminal).
2014-12-02 14:35:23,392 [2b81c153-a391-0045-d9eb-8801b7d08159:foreman] INFO o.a.drill.exec.work.foreman.Foreman - Dropping request to move to FAILED state as query is already at COMPLETED state (which is terminal).
org.apache.drill.exec.work.foreman.ForemanException: Unexpected exception during fragment initialization.
at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:194) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:254) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_45]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
Caused by: java.lang.RuntimeException: Failure while accessing Zookeeper. Failure while accessing Zookeeper
at org.apache.drill.exec.store.sys.zk.ZkAbstractStore.put(ZkAbstractStore.java:111) ~[drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.QueryStatus.updateQueryStateInStore(QueryStatus.java:132) ~[drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.Foreman.recordNewState(Foreman.java:502) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.Foreman.moveToState(Foreman.java:396) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.Foreman.runPhysicalPlan(Foreman.java:311) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:510) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:185) [drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
... 4 common frames omitted
Caused by: java.lang.RuntimeException: Failure while accessing Zookeeper
at org.apache.drill.exec.store.sys.zk.ZkEStore.createNodeInZK(ZkEStore.java:53) ~[drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
at org.apache.drill.exec.store.sys.zk.ZkAbstractStore.put(ZkAbstractStore.java:106) ~[drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]
... 10 common frames omitted
Caused by: org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /drill/running/2b81c153-a391-0045-d9eb-8801b7d08159
at org.apache.zookeeper.KeeperException.create(KeeperException.java:119) ~[zookeeper-3.4.5-mapr-1406.jar:3.4.5-mapr-1406--1]
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) ~[zookeeper-3.4.5-mapr-1406.jar:3.4.5-mapr-1406--1]
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783) ~[zookeeper-3.4.5-mapr-1406.jar:3.4.5-mapr-1406--1]
at org.apache.curator.framework.imps.CreateBuilderImpl$11.call(CreateBuilderImpl.java:676) ~[curator-framework-2.5.0.jar:na]
at org.apache.curator.framework.imps.CreateBuilderImpl$11.call(CreateBuilderImpl.java:660) ~[curator-framework-2.5.0.jar:na]
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107) ~[curator-client-2.5.0.jar:na]
at org.apache.curator.framework.imps.CreateBuilderImpl.pathInForeground(CreateBuilderImpl.java:656) ~[curator-framework-2.5.0.jar:na]
at org.apache.curator.framework.imps.CreateBuilderImpl.protectedPathInForeground(CreateBuilderImpl.java:441) ~[curator-framework-2.5.0.jar:na]
at org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:431) ~[curator-framework-2.5.0.jar:na]
at org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:44) ~[curator-framework-2.5.0.jar:na]
at org.apache.drill.exec.store.sys.zk.ZkEStore.createNodeInZK(ZkEStore.java:51) ~[drill-java-exec-0.7.0-SNAPSHOT-rebuffed.jar:0.7.0-SNAPSHOT]