[jira] [Created] (HDFS-10427) Write and Read SequenceFile Parallelly - java.io.IOException: Cannot obtain block length for LocatedBlock

["Syed Akram (JIRA)" <ji...@apache.org>]

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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