Major Description
Given an AM that fails all its attempts, the application fails and the very first click on the killed/failed vertex throws the following error:
error code: Unknown, message: expected expression, got '<'
It self corrects if tried again immediately after the failure.
This is because the RM proxy redirects the call to the AHS server and the REST call is malformed for that server. Upon inspection of the responses, it was seen that the URL looked something like this:
http://<hostname>:<ahsport>/applicationhistory/app/application_123_456/ws/v1/tez/vertexProgress?dagID=1&vertexID=01&_=123
which is not a proper Rest call on the AHS.
I think the following code can cause this issue:
// Load progress in parallel for v1 version of the api _loadProgress: function (vertices) { var that = this, runningVerticesIdx = vertices .filterBy('status', 'RUNNING') .map(function(item) { return item.get('id').split('_').splice(-1).pop(); }); if (runningVerticesIdx.length > 0) { this.store.unloadAll('vertexProgress'); this.store.findQuery('vertexProgress', { metadata: { appId: that.get('applicationId'), dagIdx: that.get('idx'), vertexIds: runningVerticesIdx.join(',') } }).then(function(vertexProgressInfo) { App.Helpers.emData.mergeRecords( that.get('rowsDisplayed'), vertexProgressInfo, ['progress'] ); }).catch(function(error) { error.message = "Failed to fetch vertexProgress. Application Master (AM) is out of reach. Either it's down, or CORS is not enabled for YARN ResourceManager."; Em.Logger.error(error); var err = App.Helpers.misc.formatError(error); var msg = 'Error code: %@, message: %@'.fmt(err.errCode, err.msg); App.Helpers.ErrorBar.getInstance().show(msg, err.details); });
which uses AMInfo that gets the response based on what loadApp method finds:
loadApp: function (store, appId, useCache) {
if(!useCache) {
App.Helpers.misc.removeRecord(store, 'appDetail', appId);
App.Helpers.misc.removeRecord(store, 'clusterApp', appId);
}
return store.find('clusterApp', appId).catch(function () {
return store.find('appDetail', appId);
}).catch(function (error) {
error.message = "Couldn't get details of application %@. RM is not reachable, and history service is not enabled.".fmt(appId);
throw error;
});
}
We can check here in the catch block if the response type is not JSON or not try and get vertexProgress since it knows that the application/AM has failed.
