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https://issues.apache.org/jira/browse/HDFS-10427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491791#comment-16491791
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Ruslan Dautkhanov commented on HDFS-10427:
------------------------------------------
We have same issue in Hadoop 2.6
> 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: Critical
>
> 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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