Enabling Soft Mount and Setting the Timeout

Describes how to enable soft mount, and set the RPC timeout for HPE Ezmeral Data Fabric components.

About this task

By default, all file system, HPE Ezmeral Data Fabric Database, and HPE Ezmeral Data Fabric-Streams operations never timeout as they wait (hard mount behavior) for the operation to succeed and/or the server to respond. You can configure a soft mount behavior by setting the values for the following parameters in the core-site.xml or hbase-site.xml file:

fs.mapr.hardmount
Specifies whether or not to enable hard mount. Value can be:
  • true - enable hard mount
  • false - disable hard mount
The default value is true.
fs.mapr.rpc.timeout
This parameter is valid for MapR 6.0.0 and earlier. Specifies the RPC timeout value in seconds. The default value is 300 seconds. The value cannot be less than 30 seconds. If the value is greater than 300 seconds, TCP keepalive probes are sent to prevent the TCP socket from timing out. If value is below 300 seconds, the RPCs will timeout after the specified time.
streams.rpc.timeout.ms
This parameter is new as of MapR 6.0.1. Specifies the RPC timeout value in milliseconds. The default value is 300000 milliseconds. The value cannot be lower than 30000 milliseconds. If the value is greater than 300000 milliseconds, TCP keepalive probes are sent to prevent the TCP socket from timing out. If value is below 30000 milliseconds, the RPCs will timeout after the specified time.

These parameter settings affect all clients.

NOTE For HPE Ezmeral Data Fabric-Streams, these parameters can be set as configuration properties when constructing the Consumer or Producer Java object. For more information, see HPE Ezmeral Data Fabric-Streams.

Enabling Soft Mount

Procedure

  1. Open the core-site.xml or hbase-site.xml file and add the parameter as follows: 
    <property>
  <name>fs.mapr.hardmount</name>
  <value>false</value>
  <description>enabling soft mount by setting value to false</description>
</property>
  2. Save and close the file.

Setting RPC Timeout

Procedure

  1. Open the core-site.xml or hbase-site.xml file and add the parameter as follows:
    As of MapR 6.0.1: 
    <property>
  <name>streams.rpc.timeout.ms</name>
  <value>300000</value>
  <description>RPC timeout value</description>
</property>
    For MapR 6.0.0 and earlier: 
    <property>
  <name>fs.mapr.rpc.timeout</name>
  <value>30</value>
  <description>RPC timeout value</description>
</property>
  2. Save and close the file.