CheckpointedFunction#snapshotState访问键控状态报错
class A extends KeyedProcessFunction<String, Object, String> implements CheckpointedFunction {
private MapState<String, LiveBean> liveBeanState;
@Override public void initializeState(FunctionInitializationContext context) throws Exception { MapStateDescriptor<String, LiveBean> descriptor = new MapStateDescriptor<>("liveState", BasicTypeInfo.STRING_TYPE_INFO, TypeInformation.of(LiveBean.class)); this.liveBeanState = context.getKeyedStateStore().getMapState(descriptor); }
@Override public void snapshotState(FunctionSnapshotContext context) throws Exception { Iterator<Map.Entry<String, LiveBean>> iter = liveBeanState.iterator(); // -> Exception here while (iter.hasNext()) { Map.Entry<String, LiveBean> e = iter.next(); hbaseDao.singlePut("table", StringUtils.reverse(e.getKey()), "cf", "info", JSON.toJSONString(e.getValue())); } }
}
异常信息如下 java.lang.NullPointerException: No key set. This method should not be called outside of a keyed context. 需要在checkpoint的时候将键控状态存入hbase，该如何处理呢*来自志愿者整理的flink
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