good read on redux action creator

https://blog.isquaredsoftware.com/2016/10/idiomatic-redux-why-use-action-creators/

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Jersey filter/Interception binding

looks like mainly 3 ways to define the filter/interceptor
1. global binding
by the @Provider annotation and implement the Client/ContaineRequest/ResponseFilter
this would apply to all request/response

2.named binding
by create new annotation of @NameBinding, which annotate the customFilter and resources together to bind them

3. Dynamic binding
by implement the dynamicFeature, which then would check the resource and register/provide corresponding filters for that resource

ref: https://dzone.com/articles/binding-strategies-for-jax-rs-filters-andintercept

cannot set niceness : Permission denied

tried to run hadoop start-dfs.sh several times, which always throw out an exception


localhost: nice: cannot set niceness: Permission denied

checking jps, the start-dfs.sh only brought up nameNode and resourceManager.

Tried several approaches on set niceness with no avail. somehow actually calling the daemon to start the datanode directly works. (event the permission denied still exist.)


lwpro2@DESKTOP-G92MK3N:~/hadoop/hadoop-2.9.1$ sbin/hadoop-daemon.sh start datanode
starting datanode, logging to /home/lwpro2/hadoop/hadoop-2.9.1/logs/hadoop-lwpro2-datanode-DESKTOP-.out
nice: cannot set niceness: Permission denied

SSH on Windows 10 Subsystem

Been cost me quite sometime to set up ssh on ubuntu (within windows 10), turns out the .ssh directory and authorized_keys file permissions needs to be corrected:


chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

https://help.ubuntu.com/community/SSH/OpenSSH/Keys#Troubleshooting