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Yongjun Zhang commented on HDFS-5939: ------------------------------------- Thanks Haohui for posting the code and ATM for the comments. Indeed, the trouble I had with creating a cluster of 0 datanode was because the replication is 0 (thus an exception thrown, which I referred to as the other problem). I thought it made sense for replication to be 0 when there is no datanode, so I was not sure whether it's a real bug. But the way modified the test made the replication non-zero, and it reproduced the bug and demonstrated the fix work fine. Now I learned that we could force the replication to be non-zero, which is a simpler solution, so I will make the change. On the other hand, I wonder if it's a bug that the system set the replication to 0 (instead of non-zero), and we now have to manually set the replication to non-zero? Thanks. > WebHdfs returns misleading error code and logs nothing if trying to create a > file with no DNs in cluster > -------------------------------------------------------------------------------------------------------- > > Key: HDFS-5939 > URL: https://issues.apache.org/jira/browse/HDFS-5939 > Project: Hadoop HDFS > Issue Type: Bug > Components: hdfs-client > Affects Versions: 2.3.0 > Reporter: Yongjun Zhang > Assignee: Yongjun Zhang > Attachments: HDFS-5939.001.patch, HDFS-5939.002.patch, > HDFS-5939.003.patch, HDFS-5939.004.patch > > > When trying to access hdfs via webhdfs, and when datanode is dead, user will > see an exception below without any clue that it's caused by dead datanode: > $ curl -i -X PUT > ".../webhdfs/v1/t1?op=CREATE&user.name=<userName>&overwrite=false" > ... > {"RemoteException":{"exception":"IllegalArgumentException","javaClassName":"java.lang.IllegalArgumentException","message":"n > must be positive"}} > Need to fix the report to give user hint about dead datanode. -- This message was sent by Atlassian JIRA (v6.1.5#6160)