[HBASE-3782] Multi-Family support for bulk upload tools causes File Not Found Exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.90.3
• Component/s: mapreduce
• Assignee: Unassigned
• Reporter: Nichole Treadway
• Created: 14/Apr/11 15:17
• Updated: 12/Jun/22 18:33
• Resolved: 16/Nov/16 21:02

Description

I've been testing HBASE-1861 in 0.90.2, which adds multi-family support for bulk upload tools.

I found that when running the importtsv program, some reduce tasks fail with a File Not Found exception if there are no keys in the input data which fall into the region assigned to that reduce task. From what I can determine, it seems that an output directory is created in the write() method and expected to exist in the writeMetaData() method...if there are no keys to be written for that reduce task, the write method is never called and the output directory is never created, but writeMetaData is expecting the output directory to exist...thus the FnF exception:

2011-03-17 11:52:48,095 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.io.FileNotFoundException: File does not exist: hdfs://master:9000/awardsData/_temporary/_attempt_201103151859_0066_r_000000_0
at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:468)
at org.apache.hadoop.hbase.regionserver.StoreFile.getUniqueFile(StoreFile.java:580)
at org.apache.hadoop.hbase.mapreduce.HFileOutputFormat$1.writeMetaData(HFileOutputFormat.java:186)
at org.apache.hadoop.hbase.mapreduce.HFileOutputFormat$1.close(HFileOutputFormat.java:247)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:567)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408)
at org.apache.hadoop.mapred.Child.main(Child.java:170)

Simply checking if the file exists should fix the issue.

Issue Links

• relates to: HBASE-4552 multi-CF bulk load is not atomic across column families
• relates to: HBASE-1861 Multi-Family support for bulk upload tools (HFileOutputFormat / loadtable.rb)