Syed Akram created HDFS-10427:
---------------------------------
Summary: Write and Read SequenceFile Parallelly -
java.io.IOException: Cannot obtain block length for LocatedBlock
Key: HDFS-10427
URL: https://issues.apache.org/jira/browse/HDFS-10427
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode, namenode
Affects Versions: 2.7.2
Reporter: Syed Akram
Priority: Blocker
Trying to Write a key/value and Read already written key/value in a
SequenceFile parallelly, But while doing that
Writer - appendOption true
java.io.IOException: Cannot obtain block length for
LocatedBlock{BP-1019538077-localhost-1459944245378:blk_1075356142_3219260;
getBlockSize()=2409; corrupt=false; offset=0;
locs=[DatanodeInfoWithStorage[dn1:50010,DS-21698924-4178-4c08-ba41-aa86770ef0d0,DISK],
DatanodeInfoWithStorage[dn3:50010,DS-8e3dc8c0-4e34-4d12-86a3-48b189b78f5d,DISK],
DatanodeInfoWithStorage[dn2:50010,DS-fb22c1c2-e059-4e0e-91e0-df838beb86f9,DISK]]}
at
org.apache.hadoop.hdfs.DFSInputStream.readBlockLength(DFSInputStream.java:428)
at
org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:336)
at
org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:272)
at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:264)
at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1526)
at
org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:303)
at
org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:299)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:299)
at
org.apache.hadoop.io.SequenceFile$Reader.openFile(SequenceFile.java:1902)
at
org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1822)
But when i'm trying to read when write (SequenceFile.Writer )is opened, it
works fine,
But when we do parallelly (both start write with append=true and then read
already existing key/value) then facing this issue.
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