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https://issues.apache.org/jira/browse/HDFS-14187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757780#comment-16757780
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Wei-Chiu Chuang commented on HDFS-14187:
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+1
> Make warning message more clear when there are not enough data nodes for EC
> write
> ---------------------------------------------------------------------------------
>
> Key: HDFS-14187
> URL: https://issues.apache.org/jira/browse/HDFS-14187
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Affects Versions: 3.1.1
> Reporter: Kitti Nanasi
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-14187.001.patch
>
>
> When setting an erasure coding policy for which there are not enough racks or
> data nodes, write will fail with the following message:
> {code:java}
> [root@oks-upgrade6727-1 ~]# sudo -u systest hdfs dfs -mkdir
> /user/systest/testdir
> [root@oks-upgrade6727-1 ~]# sudo -u hdfs hdfs ec -setPolicy -path
> /user/systest/testdir
> Set default erasure coding policy on /user/systest/testdir
> [root@oks-upgrade6727-1 ~]# sudo -u systest hdfs dfs -put /tmp/file1
> /user/systest/testdir
> 18/11/12 05:41:26 WARN hdfs.DFSOutputStream: Cannot allocate parity
> block(index=3, policy=RS-3-2-1024k). Not enough datanodes? Exclude nodes=[]
> 18/11/12 05:41:26 WARN hdfs.DFSOutputStream: Cannot allocate parity
> block(index=4, policy=RS-3-2-1024k). Not enough datanodes? Exclude nodes=[]
> 18/11/12 05:41:26 WARN hdfs.DFSOutputStream: Block group <1> failed to write
> 2 blocks. It's at high risk of losing data.
> {code}
> I suggest to log a more descriptive message suggesting to use hdfs ec
> -verifyCluster command to verify the cluster setup against the ec policies.
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