Zhong Wang created IOTDB-2234:
---------------------------------
Summary: Last queries cause NPE when last value is not cached
Key: IOTDB-2234
URL: https://issues.apache.org/jira/browse/IOTDB-2234
Project: Apache IoTDB
Issue Type: Bug
Reporter: Zhong Wang
When the last value cache is absent, LastQueryExecutor will pass a
MeasurementPath to the storage to get the last value. The MeasurementPath is
constructed using the LastValueRequest, which doesn't contain the schema. But
the storage engine assumes it does. Thus, an NPE is thrown when the storage
engine constructs the ReadOnlyMemChunk using the MeasurementPath.
Here's the full stack trace.
{code}
2021-12-29 17:59:32,243 [pool-34-IoTDB-ClusterDataRPC-Client-17] ERROR
o.a.t.ProcessFunction:47 - Internal error processing last
java.lang.NullPointerException: null
at
org.apache.iotdb.db.metadata.path.MeasurementPath.getReadOnlyMemChunkFromMemTable(MeasurementPath.java:272)
at
org.apache.iotdb.db.engine.memtable.AbstractMemTable.query(AbstractMemTable.java:370)
at
org.apache.iotdb.db.engine.storagegroup.TsFileProcessor.query(TsFileProcessor.java:1259)
at
org.apache.iotdb.db.engine.storagegroup.StorageGroupProcessor.getFileResourceListForQuery(StorageGroupProcessor.java:1869)
at
org.apache.iotdb.db.engine.storagegroup.StorageGroupProcessor.query(StorageGroupProcessor.java:1758)
at
org.apache.iotdb.db.engine.StorageEngine.query(StorageEngine.java:763)
at
org.apache.iotdb.db.query.control.QueryResourceManager.getQueryDataSource(QueryResourceManager.java:95)
at
org.apache.iotdb.db.query.executor.LastQueryExecutor.calculateLastPairForSeriesLocally(LastQueryExecutor.java:171)
at
org.apache.iotdb.cluster.query.LocalQueryExecutor.last(LocalQueryExecutor.java:1045)
at
org.apache.iotdb.cluster.server.service.DataSyncService.last(DataSyncService.java:413)
at
org.apache.iotdb.cluster.server.service.DataGroupServiceImpls.last(DataGroupServiceImpls.java:620)
at
org.apache.iotdb.cluster.rpc.thrift.TSDataService$Processor$last.getResult(TSDataService.java:2515)
at
org.apache.iotdb.cluster.rpc.thrift.TSDataService$Processor$last.getResult(TSDataService.java:2495)
at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:38)
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:38)
at
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:248)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{code}
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