About karthiknedunche

karthiknedunche · ‎07-02-2018

@vivek jain Can you upload your hbase configuration file.

karthiknedunche · ‎06-25-2018

@Geoffrey Shelton Okot @schhabra Issue was due to standby nameode was unable to become active even after active namenode fails. Issue has been solved after giving ssh password less access to both namenode.

karthiknedunche · ‎06-22-2018

I have a hbase cluster running on top of hadoop. I also have two namenode(active, standby), when i shutdown active namenode all regionserver starts to shutdown automatically, By theory standby namenode shoud take control right but why it is not happend. Anyone knows why this happens...

karthiknedunche · ‎06-20-2018

Here i just need rowkey alone based on range based, Is there any problem in creating empty row alone throughout table. Rowkey --> key1_date&time_key2 column --> empty query --> select * from table where startkey=>key1_date&time and endkey=>key1_date&time Goal is to extract key2

karthiknedunche · ‎06-16-2018

@Josh Elser Tnx dude for your reply, can you please explain me how query matcher in hbase work or else if you have a good link regarding query matcher please share with me, it will helpful for me to understand. Thank you

karthiknedunche · ‎06-15-2018

Let say i have a region with region max store file size 10 GB and after major compaction i have a single hfile with size 9GB(stored in hadoop). Now my doubt is how regionserver will read and process that 9GB file from hadoop. Will it initially load that file to regionserver inmemory? if yes how it is possible if my heap size is only 8GB?

karthiknedunche · ‎06-08-2018

zookeeper.out file growing too big. Anyone please explain me waht is the use of this file and what information is stored in this file?

karthiknedunche · ‎06-07-2018

@Geoffrey Shelton Okot Tnx dude now i understand..

karthiknedunche · ‎06-06-2018

Lets take a scenorio i have a 3 journalnode(1,2,3). All three where upto date initially. I stoped the 2nd journal node for some time and now i am going to up the 2nd journal node now how will this journal node will receive and save missed edit logs

karthiknedunche · ‎06-05-2018

I am going to add new journalnode to my hadoop cluster. So, for scp i need to select a journalnode with all edits without any lag How to find which journalnode has all edits without any lag?

karthiknedunche · ‎05-30-2018

But i am not using ambari, is there any other way to add without ambari

karthiknedunche · ‎05-30-2018

Tnx for your response @Sandeep Nemuri, Can you please explain the steps to add new journal node to running cluster

karthiknedunche · ‎05-30-2018

Here i am tring to add new journal node to hadoop cluster, Is there any way to change conf of cluster without down

karthiknedunche · ‎05-30-2018

@Artem Ervits Yes we are using SSDs, Is mileage is the only thing affected by multi WAL feature?

karthiknedunche · ‎05-19-2018

Hi everyone, I have have hbase cluster with hadoop as storage, I have planned to use MULTI WAL support to hbase to increase write efficiency. But before that i wanted to know is there any side effects to read by using MULTI WAL support. If not why hbase disabled Multi WAL support by default? Anyone please explain me.....

karthiknedunche · ‎05-10-2018

Tnx for your response dude, Can you please tell me which is the best split policy we can use or any link that has working of all split policy with merits and demerits

karthiknedunche · ‎05-09-2018

Hi, here i am using hbase and i wanted to know what is the average time taken for doing minor compaction and and also major average time taken for major compaction Is there any way to find this in hbase?

karthiknedunche · ‎05-09-2018

Here i am working with hbase and i wanted to know how many flush count per time (count per time) is safest to use. Any idea?

karthiknedunche · ‎03-29-2018

When i was planning how many region split need to be done initially to increase performance, i was confused about how region server utilizing heap memory, i have 128 GB RAM and 16 GB java heap memory, i am running both datanode and region server in the same machine can anyone tell me * How region server will use heap and what are the parameters will occupy heap memory * Is region server will use only 16 GB heap or even other space of RAM

karthiknedunche · ‎02-21-2018

Yes, dude you are right, zookeeper has the action to prevent this scenario But my question is what is that action? How client will come to know that connected zookeeper is lagging behind?

karthiknedunche · ‎02-20-2018

Can anyone tell me what happens in following scenario * There are five zookeeper servers s1,s2,s3,s4 and s5 * When client connected to the s3 it was up-to-date * client made a write request to create /test node to s3 it forwarded to leader(s5) * As s1,s2,s5 completed that request successfully so,client got the success message * But due to network problem s3 was not able to complete the work * And still client is connected with s3 * Now client is making read request for reading /test node to s3 What will happen now, is s3 will throw node not found error or anything else happen?

karthiknedunche · ‎02-08-2018

Is hbase has default support of secondary index.... On many site they suggested to use CoProcessor or Hindex If hbase has secondary index support or any alternatives how to achieve these, can any one please explain...... if hbase has no secondary index, How hbase perform in column qualifier based scan like [scan 'tablename',{COLUMNS => ['column1']}]

karthiknedunche · ‎01-20-2018

Tnx bro....

karthiknedunche · ‎01-18-2018

Compaction is the common process in the hbase my doubt is Will the client request wait until the compaction process complete or anything else?

karthiknedunche · ‎01-18-2018

What will happen is edit log on Journal node becomes large? Will standby namenode send new FSimage to active namenode? How client finds the active namenode?

karthiknedunche · ‎01-18-2018

What will happen is edit log on Journal node becomes large? Will standby namenode send new FSimage to active namenode? How client finds the active namenode?

karthiknedunche · ‎01-18-2018

Yes i saw that but he didn't explain the actual work flow

karthiknedunche · ‎01-18-2018

can you please answer to this post https://community.hortonworks.com/questions/162789/how-actually-namenode-ha-qjm-works.html

karthiknedunche · ‎01-18-2018

I read the QJM in hadoop official documentation but there is no clear control flow explanation So far I understand was When the namenode fails zookeeper failure controller will detect and change the standby namenode as active namenode. Only active namenode will write the edit log in Journal node Journal will sync the edit log with standby namenode Can any one please explain how the real flow works? For example step 1: when client connects request goes here .... step 2: it will take care of these request .... step 3: if it fails it will happen the request will go there.... Like that can anyone please explain the complete flow of QJM Thanks in advance

Online	Offline
Last Visited	‎07-02-2018 05:21 AM

Date Registered	‎01-18-2018 04:03 AM
Last Visited	‎07-02-2018 05:21 AM
Total Messages Posted	34
Total Kudos Received	3

Re: Getting error while trying to connect HBase us...

Re: Why all regionservers shutdown when active nam...

Why all regionservers shutdown when active namenod...

Is there any issues in keeping null values for row...

Re: How regionserver in hbase will read huge hfile...

How regionserver in hbase will read huge hfiles?

What is the use of zookeeper.out?

Re: How journalnode keeps itself upto date?

How journalnode keeps itself upto date?

How to find health of journalnode?

Re: How to change hadoop configuration without dow...

Re: How to change hadoop configuration without dow...

How to change hadoop configuration without down cl...

Re: Is there any side effects for MULTI WAL suppor...

Is there any side effects for MULTI WAL support in...

Re: Safe flush frequency for hbase?

Average time taken by minor and major compaction i...

Safe flush frequency for hbase?

How regionserver will utilize heap memory?

Re: How client knows zookeeper is lagging behind i...

How client knows zookeeper is lagging behind in tr...

Is hbase has default secondary index feature?

Re: Will client wait during the compaction in hbas...

Will client wait during the compaction in hbase?

Re: How actually namenode HA QJM works?

Re: How actually namenode HA QJM works?

Re: How actually namenode HA QJM works?

Re: Understanding check pointing with namenode HA

How actually namenode HA QJM works?