[jira] [Created] (HDFS-14187) Make warning message more clear when there are not enough data nodes for EC write

["Kitti Nanasi (JIRA)" <ji...@apache.org>]

Kitti Nanasi created HDFS-14187:
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             Summary: 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


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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