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From "Masatake Iwasaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6522) DN will try to append to non-existent replica if the datanode has out-dated block
Date Mon, 08 Dec 2014 09:22:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237664#comment-14237664
] 

Masatake Iwasaki commented on HDFS-6522:
----------------------------------------

Is this fixed by HDFS-5438?

> DN will try to append to non-existent replica if the datanode has out-dated block
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-6522
>                 URL: https://issues.apache.org/jira/browse/HDFS-6522
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: stanley shi
>
> My environment: HA cluster with 4 datanodes;
> Here're the steps to reproduce:
> 1. put one file (one block) to hdfs with repl=3; assume dn1, dn2, dn3 has block for this
file; dn4 don't have the block;
> 2. stop dn1;
> 4. append content to the file 100 times;
> 5. stop dn4 and start dn1;
> 6. append content to the file 100 times again;
> append will fail during the 100 appends;
> Check the datanode log on dn1, many of this log will show {quote}
> 2014-06-12 12:07:04,442 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: opWriteBlock
BP-1649188734-10.37.7.142-1398844098971:blk_1073742928_61304 received exception org.apache.hadoop.hdfs.s
> erver.datanode.ReplicaNotFoundException: Cannot append to a non-existent replica BP-1649188734-10.37.7.142-1398844098971:blk_1073742928_61304
> 2014-06-12 12:07:04,442 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: hdsh145:50010:DataXceiver
error processing WRITE_BLOCK operation  src: /10.37.7.146:55594 dest: /10.37.7
> .145:50010
> org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException: Cannot append to a non-existent
replica BP-1649188734-10.37.7.142-1398844098971:blk_1073742928_61304
>         at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getReplicaInfo(FsDatasetImpl.java:392)
>         at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.append(FsDatasetImpl.java:527)
>         at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.append(FsDatasetImpl.java:92)
>         at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:174)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:454)
>         at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:115)
>         at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:68)
>         at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:221)
>         at java.lang.Thread.run(Thread.java:722)
> {quote}



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