title: Hbase performance
body: <p>I am using Spring + Datanucleus JDO + Hbase. Hbase is on a fully distributed mode with two nodes. I am facing serious performance issues here.</p>
  
  <p>My webapp can be considered as a pinger which just keeps pinging URLS and stores their response. Hnce my app runs multiple threads for INSERT into db. I have observed that once the number of concurrent writes exceeds around 20 , the inserts start taking a lot of time (some take even 1000 secs). And when this happens READS start failing too and my webapp is not able to extract any data from the db (my webapp hangs). I am not much of a NoSQL db guy and hence do not know where to start looking for performance.</p>
  
  <p>My major configurations are:
  Zookeeper quorum size: 1
  Hbase regionservers: 2
  Data Nodes: 2
  hbase.zookeeper.property.maxClientCnxns: 400
  replication factor:3</p>
  
  <p>Do I need to increase the heap size for Hbase ? Should a high WRITE throughput have effect on READ ?</p>
  
  <p>Am I doing something wrong with the configuration? It seems writing to a file would be faster that writing data to Hbase . This is my last shot at Hbase. Please help</p>