title: Dask distributed.nanny - WARNING - Restarting worker issue
body: <p>I am using Dask and a bit confused.</p>
  
  <p>I run the below and just get this, until the process crashes.</p>
  
  <p>It uses 100% of all 4 CPU cores while its failing;</p>
  
  <p>Can anyone advise me?</p>
  
  <pre><code>distributed.nanny - WARNING - Restarting worker
  </code></pre>
  
  <p>Here is the code</p>
  
  <pre><code>import pandas as pd
  import dask.dataframe as dd
  import numpy as np
  import time
  from dask.distributed import Client
  client = Client()
  %time dahsn = dd.read_csv("US_Accidents_Dec19.csv")
  dahsn.groupby('City').count().compute()
  </code></pre>