Nitiraj Singh Rathore created HDFS-12108:
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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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