Enable hedged reads for HBase

You need to enable hedged read if a read operation from a HDFS block is slow.

The Thrift Server role is not added by default when you install HBase, but it is required before you can use certain other features such as the Hue HBase browser. To add the Thrift Server role:

1. Go to the HBase service.
2. Click the Configuration tab.
3. Select Scope > HBASE-1 (Service-Wide).
4. Select Category > Performance.
5. Configure the HDFS Hedged Read Threadpool Size and HDFS Hedged Read Delay Threshold properties. The descriptions for each of these properties on the configuration pages provide more information.
6. Enter a Reason for change, and then click Save Changes to commit the changes.