gao shan created HADOOP-13292:
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Summary: Erasure Code misfunctions when 3 DataNode down
Key: HADOOP-13292
URL: https://issues.apache.org/jira/browse/HADOOP-13292
Project: Hadoop Common
Issue Type: Bug
Affects Versions: HDFS-7285
Environment: 9 DataNode and 1 NameNode, Erasured code policy is set
as "6--3", When 3 DataNode down, erasured code fails and an exception is
thrown
Reporter: gao shan
The following is the steps to reproduce:
1) hadoop fs -mkdir /ec
2) set erasured code policy as "6-3"
3) "write" data by :
time hadoop jar
/opt/hadoop/hadoop-3.0.0-SNAPSHOT/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-3.0.0-SNAPSHOT.jar
TestDFSIO -D test.build.data=/ec -write -nrFiles 30 -fileSize 12288
-bufferSize 1073741824
4) Manually down 3 nodes. Kill the threads of "datanode" and "nodemanager" in
3 DataNode.
5) By using erasured code to "read" data by:
time hadoop jar
/opt/hadoop/hadoop-3.0.0-SNAPSHOT/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-3.0.0-SNAPSHOT.jar
TestDFSIO -D test.build.data=/ec -read -nrFiles 30 -fileSize 12288
-bufferSize 1073741824
then the failure occurs and the exception is thrown as:
INFO mapreduce.Job: Task Id : attempt_1465445965249_0008_m_000034_2, Status :
FAILED
Error: java.io.IOException: 4 missing blocks, the stripe is: Offset=0,
length=8388608, fetchedChunksNum=0, missingChunksNum=4
at
org.apache.hadoop.hdfs.DFSStripedInputStream$StripeReader.checkMissingBlocks(DFSStripedInputStream.java:614)
at
org.apache.hadoop.hdfs.DFSStripedInputStream$StripeReader.readParityChunks(DFSStripedInputStream.java:647)
at
org.apache.hadoop.hdfs.DFSStripedInputStream$StripeReader.readStripe(DFSStripedInputStream.java:762)
at
org.apache.hadoop.hdfs.DFSStripedInputStream.readOneStripe(DFSStripedInputStream.java:316)
at
org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:450)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:941)
at java.io.DataInputStream.read(DataInputStream.java:149)
at org.apache.hadoop.fs.TestDFSIO$ReadMapper.doIO(TestDFSIO.java:531)
at org.apache.hadoop.fs.TestDFSIO$ReadMapper.doIO(TestDFSIO.java:508)
at org.apache.hadoop.fs.IOMapperBase.map(IOMapperBase.java:134)
at org.apache.hadoop.fs.IOMapperBase.map(IOMapperBase.java:37)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
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:1669)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
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