I have tried several scenarios to generate cache miss in HBase with HDP 2.6.5. Different steps I followed include:  1) putting value in HBase using put command and fetching using get command.  2) putting value in HBase with put command , flushing and the trying to fetch the data.  None of this creates cache misses. Infact the hits and hits caching keeps increasing by multiple counts during flushing. Misses and misses caching always remains zero. Why is this  behaviour occurring? What is the difference between misses and misses caching and hits and hits caching? I will attach the screen shots of region server logs.     ... View more

In Hbase as per my reading the reads happens by first checking in blockcache, if missed then Memcache,if missed then use bloom filters to check for the record and finally use index on the HFile to read the data. But what if all the data is compressed? How can it find the index and read the data from a compressed Hfile? Even if read from where does the decompression occur? Is it from client? ... View more

I have setup user authentication using ldap for nifi. Now when Iam able to add new users and achieve access restrictions to different users etc. But still now Iam not able to understand how to truly achieve multi-tenancy with nifi. For eg. when I add new users and to let them view the interface I give the policy to view the interface. But the user is still able to see all the components positions and connections even though not able to access them. This is not true multi-tenancy as I understand because users should not be able to see things even though not accessible to them. The same is problem with the controllers. Users are able to view them but not access or edit. It is also not possible to create a admin just for a tenant. Is there anyway we can truly achieve this in nifi? @MattWho  @bbende  @pam1  ... View more