[GitHub] [accumulo] keith-turner opened a new issue #1286: Bulk importing empty directory resulted in error

[GitBox]

keith-turner opened a new issue #1286: Bulk importing empty directory resulted 
in error
URL: https://github.com/apache/accumulo/issues/1286
 
 
   I accidentally bulk imported a directory that I had previously imported.  So 
the directory had no files in it.  I saw the following in the shell.   I am 
thinking it should not be an error in this case.  If we actually want an error 
for zero files, then it should be a nice clear error message.
   
   ```
   root@muchos ci> importdirectory /tmp/bt/1/files true
   2019-07-23 16:37:22,511 [shell.Shell] ERROR: 
org.apache.accumulo.core.client.AccumuloException: Internal error processing 
waitForFateOperation
   ```
   
   I saw the following in the master logs.
   
   ```
   2019-07-23 16:37:29,937 [thrift.ProcessFunction] ERROR: Internal error 
processing waitForFateOperation
   com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: 
Expected BEGIN_OBJECT but was END_ARRAY at line 1 column 3 path $[0]
           at 
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:226)
           at com.google.gson.Gson.fromJson(Gson.java:927)
           at 
org.apache.accumulo.core.clientImpl.bulk.LoadMappingIterator.next(LoadMappingIterator.java:73)
           at 
org.apache.accumulo.core.clientImpl.bulk.LoadMappingIterator.next(LoadMappingIterator.java:40)
           at 
com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
           at 
org.apache.accumulo.master.tableOps.bulkVer2.PrepBulkImport.checkForMerge(PrepBulkImport.java:108)
           at 
org.apache.accumulo.master.tableOps.bulkVer2.PrepBulkImport.checkForMerge(PrepBulkImport.java:167)
           at 
org.apache.accumulo.master.tableOps.bulkVer2.PrepBulkImport.call(PrepBulkImport.java:175)
           at 
org.apache.accumulo.master.tableOps.bulkVer2.PrepBulkImport.call(PrepBulkImport.java:68)
           at 
org.apache.accumulo.master.tableOps.TraceRepo.call(TraceRepo.java:49)
           at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:76)
           at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
           at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
           at 
org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
           at java.lang.Thread.run(Thread.java:748)
   Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was 
END_ARRAY at line 1 column 3 path $[0]
           at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385)
           at 
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:215)
           ... 14 more
   ```

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