We are running CDH 4.1.3 distro and trying to ready file. It ends up with exception @datanode saying
2016-06-02 10:43:26,354 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(X.X.X.X, storageID=DS-404876644-X.X.X.X-50010-1462535537579, infoPort=50075, ipcPort=50020, storageInfo=lv=-40;cid=cluster18;nsid=2115086255;c=0):Got exception while serving BP-2091182050-X.X.X.X-1358362115729:blk_5037101550399368941_420502314 to /X.X.X.X:58614 java.io.IOException: Need 10172416 bytes, but only 10072576 bytes available at org.apache.hadoop.hdfs.server.datanode.BlockSender.waitForMinLength(BlockSender.java:387) at org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:189) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:268) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:88) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:63) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:219) at java.lang.Thread.run(Thread.java:662) 2016-06-02 10:43:26,354 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: app112.rutarget.ru:50010:DataXceiver error processing READ_BLOCK operation src: /X.X.X.X:58614 dest: /X.X.X.X:50010 java.io.IOException: Need 10172416 bytes, but only 10072576 bytes available at org.apache.hadoop.hdfs.server.datanode.BlockSender.waitForMinLength(BlockSender.java:387) at org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:189) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:268) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:88) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:63) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:219) at java.lang.Thread.run(Thread.java:662) FSCK shows file as being open for write, however hdfs client that handles writes to this file closed it long time ago -- so file stucked in RBW for a few last days. How can we get actual data block in this case? I found only binary .meta file on datanode but not actual block with data. -- p t
