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https://issues.apache.org/jira/browse/HDFS-13635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Bota updated HDFS-13635:
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Attachment: HDFS-13635.001.patch
> 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
> Assignee: Gabor Bota
> Priority: Major
> Attachments: HDFS-13635.001.patch
>
>
> 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. It should just state "block is not found"
> 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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