问题
Is there any way to append to a file on HDFS from command line like copying file:
hadoop fs -copyFromLocal <localsrc> URI
回答1:
This feature is implemented in Hadoop 2.3.0 as appendToFile with a syntax like:
hdfs dfs -appendToFile localfile /user/hadoop/hadoopfile
(it was first suggested in 2009 when the HDFS Append feature was being contemplated: https://issues.apache.org/jira/browse/HADOOP-6239 )
回答2:
cli doesn't support append, but httpfs and fuse both has support for appending files.
w301% ls -lA
total 0
-rw-r--r-- 1 hdfs supergroup 0 Nov 14 01:02 test.me
w301% cat test.me
w301% sync
w301% cat test.me
hello
w301% echo "more rows" >> test.me
w301% sync
w301% cat test.me
hello
more rows
EDIT: but keep in mind, that only one client can append to file.
来源：https://stackoverflow.com/questions/13365604/hdfs-command-line-append