haiyang1987 opened a new pull request, #6374: URL: https://github.com/apache/hadoop/pull/6374
### Description of PR https://issues.apache.org/jira/browse/HDFS-17298 There are some NPE issues on the DataNode side of our online environment. The detailed exception information is ``` 2023-12-20 13:58:25,449 ERROR datanode.DataNode (DataXceiver.java:run(330)) [DataXceiver for client DFSClient_NONMAPREDUCE_xxx at /xxx:41452 [Sending block BP-xxx:blk_xxx]] - xxx:50010:DataXceiver error processing READ_BLOCK operation src: /xxx:41452 dst: /xxx:50010 java.lang.NullPointerException at org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:301) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:607) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:152) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:104) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:298) at java.lang.Thread.run(Thread.java:748) ``` NPE Code logic: ``` if (!fromScanner && blockScanner.isEnabled()) { // data.getVolume(block) is null blockScanner.markSuspectBlock(data.getVolume(block).getStorageID(), block); } ``` ``` 2023-12-20 13:52:18,844 ERROR datanode.DataNode (DataXceiver.java:run(330)) [DataXceiver for client /xxx:61052 [Copying block BP-xxx:blk_xxx]] - xxx:50010:DataXceiver error processing COPY_BLOCK operation src: /xxx:61052 dst: /xxx:50010 java.lang.NullPointerException at org.apache.hadoop.hdfs.server.datanode.DataNode.handleBadBlock(DataNode.java:4045) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.copyBlock(DataXceiver.java:1163) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opCopyBlock(Receiver.java:291) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:113) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:298) at java.lang.Thread.run(Thread.java:748) ``` NPE Code logic: ``` // Obtain a reference before reading data volumeRef = datanode.data.getVolume(block).obtainReference(); //datanode.data.getVolume(block) is null We need to fix it. ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
