Thomas Marquardt created HADOOP-14996:
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Summary: wasb: ReadFully occasionally fails when using page blobs
Key: HADOOP-14996
URL: https://issues.apache.org/jira/browse/HADOOP-14996
Project: Hadoop Common
Issue Type: Bug
Components: fs/azure
Reporter: Thomas Marquardt
Assignee: Thomas Marquardt
Looks like there is a functional bug or concurrency bug in the
PageBlobInputStream implemenation of ReadFully.
1) Use 1 mapper to copy results in success:
hadoop distcp -m 1
wasb://[email protected]/hive_tables
wasb://[email protected]/hdi_backup
2) Turn on DEBUG log by setting mapreduce.map.log.level=DEBUG in ambari. Then
run with more than 1 mapper:
Saw debug log like this:
2017-10-27 06:18:53,545 DEBUG [main]
org.apache.hadoop.fs.azure.NativeAzureFileSystem: Seek to position 136251.
Bytes skipped 136210
2017-10-27 06:18:53,549 DEBUG [main]
org.apache.hadoop.fs.azure.AzureNativeFileSystemStore: Closing page blob output
stream.
2017-10-27 06:18:53,549 DEBUG [main]
org.apache.hadoop.fs.azure.AzureNativeFileSystemStore:
java.util.concurrent.ThreadPoolExecutor@73dce0e6[Terminated, pool size = 0,
active threads = 0, queued tasks = 0, completed tasks = 0]
2017-10-27 06:18:53,549 DEBUG [main]
org.apache.hadoop.security.UserGroupInformation: PrivilegedActionException
as:mssupport (auth:SIMPLE) cause:java.io.EOFException
2017-10-27 06:18:53,553 WARN [main] org.apache.hadoop.mapred.YarnChild:
Exception running child : java.io.EOFException
at java.io.DataInputStream.readFully(DataInputStream.java:197)
at java.io.DataInputStream.readFully(DataInputStream.java:169)
at org.apache.hadoop.io.SequenceFile$Reader.sync(SequenceFile.java:2693)
at
org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader.initialize(SequenceFileRecordReader.java:58)
at
org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:548)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:786)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1866)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)
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