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From "Nitiraj Singh Rathore (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12108) Hdfs tail -f command keeps printing the last line in loop when more data is not available
Date Mon, 10 Jul 2017 09:08:00 GMT
Nitiraj Singh Rathore created HDFS-12108:
--------------------------------------------

             Summary: Hdfs tail -f command keeps printing the last line in loop when more
data is not available
                 Key: HDFS-12108
                 URL: https://issues.apache.org/jira/browse/HDFS-12108
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.7.3
            Reporter: Nitiraj Singh Rathore


I tried to do the simple tail -f expecting that new data will keep appearing on console, but
I found out that in the absence of new data the last line of the file keeps printing again
and again. See the below output. For clarification I have also pasted the output of cat command
for the same file.

bq. [hdfs@c6401 lib]$ hdfs dfs -tail -f /ats/active/application_1499594381431_0001/appattempt_1499594381431_0001_000001/domainlog-appattempt_1499594381431_0001_000001
bq. {"id":"Tez_ATS_application_1499594381431_0001","readers":"*","writers":"hive"}
bq. {"id":"Tez_ATS_application_1499594381431_0001_1","readers":"*","writers":"hive"}
bq. {"id":"Tez_ATS_application_1499594381431_0001_1","readers":"*","writers":"hive"}
bq. {"id":"Tez_ATS_application_1499594381431_0001_1","readers":"*","writers":"hive"}
bq. {"id":"Tez_ATS_application_1499594381431_0001_1","readers":"*","writers":"hive"}
bq. 
bq. [hdfs@c6401 lib]$ hdfs dfs -cat  /ats/active/application_1499594381431_0001/appattempt_1499594381431_0001_000001/domainlog-appattempt_1499594381431_0001_000001
bq. {"id":"Tez_ATS_application_1499594381431_0001","readers":"*","writers":"hive"}
bq. {"id":"Tez_ATS_application_1499594381431_0001_1","readers":"*","writers":"hive"}[hdfs@c6401
lib]$



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