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https://issues.apache.org/jira/browse/HDFS-6325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Plamen Jeliazkov reassigned HDFS-6325:
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    Assignee: Plamen Jeliazkov

> Append should fail if the last block has insufficient number of replicas
> ------------------------------------------------------------------------
>
>                 Key: HDFS-6325
>                 URL: https://issues.apache.org/jira/browse/HDFS-6325
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.2.0
>            Reporter: Konstantin Shvachko
>            Assignee: Plamen Jeliazkov
>         Attachments: appendTest.patch
>
>
> Currently append() succeeds on a file with the last block that has no 
> replicas. But the subsequent updatePipeline() fails as there are no replicas 
> with the exception "Unable to retrieve blocks locations for last block". This 
> leaves the file unclosed, and others can not do anything with it until its 
> lease expires.
> The solution is to check replicas of the last block on the NameNode and fail 
> during append() rather than during updatePipeline().
> How many replicas should be present before NN allows to append? I see two 
> options:
> # min-replication: allow append if the last block is minimally replicated (1 
> by default)
> # full-replication: allow append if the last block is fully replicated (3 by 
> default)



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