Suspicious node detection and recovery in MapReduce computing

A computer-implemented method for detecting and correcting malicious nodes in a cloud computing environment, the method comprising:

• selecting a task to dispatch to a first worker node;
• setting a suspicion index threshold for the selected task;
• determining a suspicion index for the selected task;
• comparing the suspicion index to the suspicion index threshold;
• receiving a result from the first worker node when the suspicion index does not exceed the selected suspicion index threshold;
• and
• applying a recovery action when the suspicion index exceeds the selected suspicion index threshold;
• wherein the applying a recovery action comprises:
• selecting a second worker node and a third worker node for the selected task;
• comparing results returned by the first worker node to results returned by the second worker node and to the results returned by the third worker node;
• and,
• stopping use of the first worker node conditioned upon a negative match of the results returned by the first worker node to the results returned by the second worker node and the results returned by the third worker node.

A computer-implemented method for detecting and correcting malicious nodes in a cloud computing environment, the method comprising:

• selecting a task to dispatch to a first worker node;
• setting a suspicion index threshold for the selected task;
• determining a suspicion index for the selected task;
• comparing the suspicion index to the suspicion index threshold;
• receiving a result from the first worker node when the suspicion index does not exceed the selected suspicion index threshold;
• and
• applying a recovery action when the suspicion index exceeds the selected suspicion index threshold;
• wherein the applying a recovery action comprises:
• selecting a second worker node and a third worker node for a new selected task;
• comparing results returned by the first worker node to results returned by the second worker node and to the results returned by the third worker node;
• and,
• lowering the suspicion index of the first worker node conditioned upon a positive match of the results returned by the first worker node to the results returned by the second worker node and the results returned by the third worker node.