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Posted to hdfs-dev@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2018/05/29 19:55:00 UTC
[jira] [Created] (HDFS-13635) Incorrect message when block is not
found
Wei-Chiu Chuang created HDFS-13635:
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Summary: Incorrect message when block is not found
Key: HDFS-13635
URL: https://issues.apache.org/jira/browse/HDFS-13635
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Reporter: Wei-Chiu Chuang
When client opens a file, it asks DataNode to check the blocks' visible length. If somehow the block is not on the DN, it throws "Cannot append to a non-existent replica" message, which is incorrect, because getReplicaVisibleLength() is called for different use, just not for appending to a block.
The following stacktrace comes from a CDH5.13, but it looks like the same warning exists in Apache Hadoop trunk.
{noformat}
2018-05-29 09:23:41,966 INFO org.apache.hadoop.ipc.Server: IPC Server handler 2 on 50020, call org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol.getReplicaVisibleLength from 10.0.0.14:53217 Call#38334117 Retry#0
org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException: Cannot append to a non-existent replica BP-725378529-10.236.236.8-1410027444173:13276792346
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getReplicaInfo(FsDatasetImpl.java:792)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getReplicaVisibleLength(FsDatasetImpl.java:2588)
at org.apache.hadoop.hdfs.server.datanode.DataNode.getReplicaVisibleLength(DataNode.java:2756)
at org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolServerSideTranslatorPB.getReplicaVisibleLength(ClientDatanodeProtocolServerSideTranslatorPB.java:107)
at org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos$ClientDatanodeProtocolService$2.callBlockingMethod(ClientDatanodeProtocolProtos.java:17873)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2217)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2211){noformat}
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