Radeity commented on PR #248:
URL: 
https://github.com/apache/incubator-hugegraph-computer/pull/248#issuecomment-1566193609

   > ci error:
   > 
   > ```java
   > Error:  Tests run: 563, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 
218.399 s <<< FAILURE! - in 
org.apache.hugegraph.computer.suite.unit.UnitTestSuite
   > Error:  
testRunAlgorithmFromHdfs(org.apache.hugegraph.computer.algorithm.centrality.degree.DegreeCentralityTest)
  Time elapsed: 4.379 s  <<< FAILURE!
   > java.lang.AssertionError: [java.util.concurrent.CompletionException: 
org.apache.hugegraph.computer.core.common.exception.ComputerException: An 
exception occurred during parallel sending edges, null]
   >    at 
org.apache.hugegraph.computer.algorithm.centrality.degree.DegreeCentralityTest.testRunAlgorithmFromHdfs(DegreeCentralityTest.java:50)
   > 
   > [INFO] 
   > [INFO] Results:
   > [INFO] 
   > Error:  Failures: 
   > Error:    
DegreeCentralityTest.testRunAlgorithmFromHdfs:50->AlgorithmTestBase.runAlgorithm:147
 [java.util.concurrent.CompletionException: 
org.apache.hugegraph.computer.core.common.exception.ComputerException:
   >   An exception occurred during parallel sending edges, null]
   > [INFO] 
   > Error:  Tests run: 563, Failures: 1, Errors: 0, Skipped: 0
   > ```
   
   Hi, @javeme , I've checked recent CI logs, the error is caused by 
`IOException: Filesystem closed` when reading data from HDFS and checking 
whether it's open. In addition, I find that some `TransportException` were 
thrown before, thus I guess maybe there's something wrong with CI environment?


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