See this link for info on iNotify, particularly slide #16.
You must run this tool as the hdfs user.
$ jar hdfs-inotify-example-uber.jar <HDFS URI> <TxId>
This is a quick and dirty example. If you omit the TxId arg, like this:
$ hadoop jar hdfs-inotify.jar hdfs://hadoop-node-cluster:<port_number>
The output might be quite verbose, as you will get all TxId information.
So you might want to start with a large TxId and then work backwards if you don't get any events. If the TxId is larger than the number of tx's then you will simply get no data back)
For my test on a new HDFS I will start will a TxId of 0:
$ hadoop jar hdfs-inotify-example.jar hdfs://emr-header-1.cluster-68492:9000 0
I see an output that ends like this:
...
TxId = 351352
event type = CREATE
path = /tmp/.cloudera_health_monitoring_canary_files/.canary_file_2015_07_10-20_29_11
owner = hdfs
ctime = 1436585351213
Ctrl+C to kill the app
From that you can see the last TxId was 351352.
You can then call the app like this to get all subsequent tx's:
$ sudo -u hdfs java -jar hdfs-inotify-example-uber.jar hdfs://brooklyn.onefoursix.com:8020 351352
While that is still running, in another session, create a couple of files in HDFS, then delete one (without using -skipTrash) and delete the other with -skipTrash.
You should see a couple of CREATE , RENAME, UNLINK, APPEND, and CLOSE like this:
TxId = 351411
event type = CREATE
path = /user/mark/data106.txt._COPYING_
owner = mark
ctime = 1436585999907
TxId = 351412
event type = CLOSE
TxId = 351413
event type = RENAME
src = /user/mark/data106.txt._COPYING_
dst = /user/mark/data106.txt
timestamp = 1436586000137
TxId = 351420
event type = RENAME
src = /user/mark/data106.txt
dst = /user/mark/.Trash/Current/user/mark/data106.txt
timestamp = 1436586013973
TxId = 351421
event type = CREATE
path = /user/mark/data107.txt._COPYING_
owner = mark
ctime = 1436586067256
TxId = 351425
event type = CLOSE
TxId = 351426
event type = RENAME
src = /user/mark/data107.txt._COPYING_
dst = /user/mark/data107.txt
timestamp = 1436586067489
TxId = 351427
event type = UNLINK
path = /user/mark/data107.txt
timestamp = 1436586074079
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