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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