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Haohui Mai commented on HDFS-5939: ---------------------------------- The patch mostly looks good. Three more minor issues: {code} + public void testNoDatanode() throws Exception { {code} Can you rename the test to convey more information? For example, {{testCreateWithNoDN}}? {code} + fs.create(new Path("/testnodatanode")).close(); + } catch (IOException ex) { ... {code} The code needs to call {{Assert.fail()}} right after {{fs.create()}}. {code} + LOG.info("Caught exception \"" + ex + "\" " + + (expected? " as expected." : "unexpectedly.")); {code} You might want to remove this message as well. > 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, HDFS-5939.005.patch, > HDFS-5939.006.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)