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Impala Assignment locality concerning

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Impala Assignment locality concerning

Explorer
Hi guys,
I'm getting this alert very often in impala. Please help
 
52.78% of assignments operating on local data over the past 15 minute(s). 95 local assignments. 180 total assignments. Warning threshold: 80.00%.
1 ACCEPTED SOLUTION

Accepted Solutions

Re: Impala Assignment locality concerning

Champion

I dont kow if you have a custom trigger or a built in trigger for health test. 

Is the health test showing warning or critical or bad ? 

 

either way the test is  to find the data locality in the host .

" Make sure that Impala Daemon is co-located with a DataNode, and that the IP address of each Impala Daemon matches the IP address of its co-located DataNode" 

 

Please make sure if  you have enabled the below properties in hdfs-site.xml

 

 

<property>
    <name>dfs.client.read.shortcircuit</name>
    <value>true</value>
</property>

<property>
    <name>dfs.domain.socket.path</name>
    <value>/var/run/hdfs-sockets/dn</value>
</property>

<property>
    <name>dfs.client.file-block-storage-locations.timeout.millis</name>
    <value>10000</value>
</property>

Reference 

https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_config_performance.html#config...

1 REPLY 1

Re: Impala Assignment locality concerning

Champion

I dont kow if you have a custom trigger or a built in trigger for health test. 

Is the health test showing warning or critical or bad ? 

 

either way the test is  to find the data locality in the host .

" Make sure that Impala Daemon is co-located with a DataNode, and that the IP address of each Impala Daemon matches the IP address of its co-located DataNode" 

 

Please make sure if  you have enabled the below properties in hdfs-site.xml

 

 

<property>
    <name>dfs.client.read.shortcircuit</name>
    <value>true</value>
</property>

<property>
    <name>dfs.domain.socket.path</name>
    <value>/var/run/hdfs-sockets/dn</value>
</property>

<property>
    <name>dfs.client.file-block-storage-locations.timeout.millis</name>
    <value>10000</value>
</property>

Reference 

https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_config_performance.html#config...