private void watchForAbortedProcedures() {
LOG.debug("Checking for aborted procedures on node: '" + zkController.getAbortZnode() + "'");
try {
// this is the list of the currently aborted procedues
for (String node :
ZKUtil.listChildrenAndWatchForNewChildren(
zkController.getWatcher(), zkController.getAbortZnode())) {
String abortNode = ZKUtil.joinZNode(zkController.getAbortZnode(), node);
abort(abortNode);
}
} catch (KeeperException e) {
member.controllerConnectionFailure(
"Failed to list children for abort node:" + zkController.getAbortZnode(), e, null);
}
}
/**
* Pass along the found abort notification to the listener
*
* @param abortZNode full znode path to the failed procedure information
*/
protected void abort(String abortZNode) {
LOG.debug("Aborting procedure member for znode " + abortZNode);
String opName = ZKUtil.getNodeName(abortZNode);
try {
byte[] data = ZKUtil.getData(zkController.getWatcher(), abortZNode);
// figure out the data we need to pass
ForeignException ee;
try {
if (data == null || data.length == 0) {
// ignore
return;
} else if (!ProtobufUtil.isPBMagicPrefix(data)) {
String msg =
"Illegally formatted data in abort node for proc "
+ opName
+ ". Killing the procedure.";
LOG.error(msg);
// we got a remote exception, but we can't describe it so just return exn from here
ee = new ForeignException(getMemberName(), new IllegalArgumentException(msg));
} else {
data = Arrays.copyOfRange(data, ProtobufUtil.lengthOfPBMagic(), data.length);
ee = ForeignException.deserialize(data);
}
} catch (InvalidProtocolBufferException e) {
LOG.warn(
"Got an error notification for op:"
+ opName
+ " but we can't read the information. Killing the procedure.");
// we got a remote exception, but we can't describe it so just return exn from here
ee = new ForeignException(getMemberName(), e);
}
this.member.receiveAbortProcedure(opName, ee);
} catch (KeeperException e) {
member.controllerConnectionFailure(
"Failed to get data for abort znode:" + abortZNode + zkController.getAbortZnode(),
e,
opName);
} catch (InterruptedException e) {
LOG.warn("abort already in progress", e);
Thread.currentThread().interrupt();
}
}
