HBase maxIdleTime

HBaseClient端会建立跟HRegionServer或者HMaster的tcp连接，而这个连接在一定时间内没有请求的话，那么这个连接就会被关闭。如果应用请求比较少，加上跨机房的话，tcp连接的建立会比较耗时，导致请求rt稍高，这个时候可以调整tcp连接的存活时间，参数是client端的

 this.maxIdleTime = conf.getInt("hbase.ipc.client.connection.maxidletime", 10000);

  //10s

 

具体逻辑在HBaseClient 的Connection.waitForWork里面

HBaseClient

    /* wait till someone signals us to start reading RPC response or

     * it is idle too long, it is marked as to be closed,

     * or the client is marked as not running.

     *

     * Return true if it is time to read a response; false otherwise.

     */

    @SuppressWarnings({"ThrowableInstanceNeverThrown"})

    protected synchronized boolean waitForWork() {

 

        } else if (calls.isEmpty()) { // idle connection closed or stopped

            markClosed(null);

            return false;

        }

 

    }