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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8699) DFSClient hang up when there are not sufficient DataNodes in EC cluster.
Date Tue, 30 Jun 2015 08:29:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14607940#comment-14607940
] 

Walter Su commented on HDFS-8699:
---------------------------------

Thanks [~kaisasak] for reporting. Actually this is duplicated with HDFS-8220.

> DFSClient hang up when there are not sufficient DataNodes in EC cluster.
> ------------------------------------------------------------------------
>
>                 Key: HDFS-8699
>                 URL: https://issues.apache.org/jira/browse/HDFS-8699
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Kai Sasaki
>            Assignee: Kai Sasaki
>
> 6-3 RS schema requires 9 data nodes at least to work properly. However when there are
not sufficient DataNodes in EC cluster, writing file fails because of NullPointerException.
And also client is hang up. 
> {code}
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1463)
>         at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:591)
>         at org.apache.hadoop.hdfs.StripedDataStreamer.run(StripedDataStreamer.java:49)
> {code}
>         
> DFSClient should handle insufficient DN error properly just like replication blocks.



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