Hello Nasron, The read hanging is an HDFS timeout issue, to work around it you would need an HDFS version which has HADOOP-12672. After that, you should be able to set ipc.client.rpc-timeout.ms to a reasonable value in Impala's HDFS client settings.
HTH On 8 September 2017 at 20:24, Nasron Cheong <[email protected]> wrote: > We encountered an issue where our hdfs cluster misbehaved, which resulted in > very slow reads. However, existing impala queries would continue even if > cancelled, presumably being blocked by the hdfs read. > > Are there settings to be less aggressive on hdfs reads so we can fail more > quickly if hdfs is the issue? > > Thanks. > > - Nasron
