public void restoreStateLazy() throws Exception {
if (lazyRestoreState != null) {
LOG.info("Restoring checkpointed state to task {}", getName());
try {
final StreamOperator<?>[] allOperators = operatorChain.getAllOperators();
final StreamTaskState[] states = lazyRestoreState.getState(userClassLoader);
// be GC friendly
lazyRestoreState = null;
for (int i = 0; i < states.length; i++) {
StreamTaskState state = states[i];
StreamOperator<?> operator = allOperators[i];
if (state != null && operator != null) {
LOG.debug("Task {} in chain ({}) has checkpointed state", i, getName());
operator.restoreState(state);
} else if (operator != null) {
LOG.debug("Task {} in chain ({}) does not have checkpointed state", i, getName());
}
}
} catch (Exception e) {
throw new Exception("Could not restore checkpointed state to operators and functions", e);
}
}
}
