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From Owen O'Malley <owen.omal...@gmail.com>
Subject Re: large block size problem
Date Sun, 15 Mar 2009 17:42:29 GMT
I seem to remember someone saying that blocks over 2^31 don't work. I  
don't know if there is a jira already.

-- Owen

On Mar 14, 2009, at 20:28, Raghu Angadi <rangadi@yahoo-inc.com> wrote:

>
> I haven't looked much into this but most likely this is a bug. I am  
> pretty sure large block size is not handled correctly.
>
> A fix might be pretty straight fwd. I suggest you to file a jira and  
> preferably give any justification for large block sizes. I don't  
> think there is any reason to limit the block size.
>
> Raghu.
>
> Mike Andrews wrote:
>> hi there,
>> i tried "-put" then "-cat" for a 1.6 gb file and it worked fine, but
>> when trying it on a 16.4 gb file ("bigfile.dat"), i get the following
>> errors (see below). i got this failure both times i tried it, each
>> with a fresh install of single-node 0.19.1. also, i set block size to
>> 32 gb with larger buffer and checksum sizes in config (see below as
>> well) -- any thoughts on what i may be doing wrong, or is it a bug?
>> ---
>> <configuration>
>> <property>
>>  <name>dfs.block.size</name>
>>  <value>34359738368</value>
>>  <description>The default block size for new files.</description>
>> </property>
>> <property>
>>  <name>io.file.buffer.size</name>
>>  <value>65536</value>
>>  <description>The size of buffer for use in sequence files.
>>  The size of this buffer should probably be a multiple of hardware
>>  page size (4096 on Intel x86), and it determines how much data is
>>  buffered during read and write operations.</description>
>> </property>
>> <property>
>>  <name>io.bytes.per.checksum</name>
>>  <value>4096</value>
>>  <description>The number of bytes per checksum.  Must not be larger  
>> than
>>  io.file.buffer.size.</description>
>> </property><property>
>>    <name>fs.default.name</name>
>>    <value>hdfs://localhost:9000</value>
>>  </property>
>>  <property>
>>    <name>mapred.job.tracker</name>
>>    <value>localhost:9001</value>
>>  </property>
>>  <property>
>>    <name>dfs.replication</name>
>>    <value>1</value>
>> </property>
>> </configuration>
>> [mra@sacws hadoop-0.19.1]$ bin/hadoop fs -put /tmp/bigfile.dat /
>> [mra@sacws hadoop-0.19.1]$ bin/hadoop fs -cat /bigfile.dat | md5sum
>> 09/03/14 15:52:34 WARN hdfs.DFSClient: Exception while reading from
>> blk_-4992364814640383286_1013 of /bigfile.dat from 127.0.0.1:50010:
>> java.io.IOException: BlockReader: error in packet  
>> header(chunkOffset :
>> 415956992, dataLen : 41284, seqno : 0 (last: -1))
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.readChunk(DFSClient.java:1186)
>>    at  
>> org. 
>> apache. 
>> hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:238)
>>    at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java: 
>> 190)
>>    at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java: 
>> 159)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.read(DFSClient.java:1060)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.readBuffer(DFSClient.java:1615)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.read(DFSClient.java:1665)
>>    at java.io.DataInputStream.read(DataInputStream.java:83)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:53)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:85)
>>    at org.apache.hadoop.fs.FsShell.printToStdout(FsShell.java:120)
>>    at org.apache.hadoop.fs.FsShell.access$100(FsShell.java:49)
>>    at org.apache.hadoop.fs.FsShell$1.process(FsShell.java:351)
>>    at org.apache.hadoop.fs.FsShell 
>> $DelayedExceptionThrowing.globAndProcess(FsShell.java:1872)
>>    at org.apache.hadoop.fs.FsShell.cat(FsShell.java:345)
>>    at org.apache.hadoop.fs.FsShell.doall(FsShell.java:1519)
>>    at org.apache.hadoop.fs.FsShell.run(FsShell.java:1735)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
>>    at org.apache.hadoop.fs.FsShell.main(FsShell.java:1854)
>> 09/03/14 15:52:34 INFO hdfs.DFSClient: Could not obtain block
>> blk_-4992364814640383286_1013 from any node:  java.io.IOException: No
>> live nodes contain current block
>> 09/03/14 15:52:37 WARN hdfs.DFSClient: Exception while reading from
>> blk_-4992364814640383286_1013 of /bigfile.dat from 127.0.0.1:50010:
>> java.io.IOException: BlockReader: error in packet  
>> header(chunkOffset :
>> 415956992, dataLen : 41284, seqno : 0 (last: -1))
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.readChunk(DFSClient.java:1186)
>>    at  
>> org. 
>> apache. 
>> hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:238)
>>    at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java: 
>> 190)
>>    at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java: 
>> 159)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.read(DFSClient.java:1060)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.readBuffer(DFSClient.java:1615)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.read(DFSClient.java:1665)
>>    at java.io.DataInputStream.read(DataInputStream.java:83)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:53)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:85)
>>    at org.apache.hadoop.fs.FsShell.printToStdout(FsShell.java:120)
>>    at org.apache.hadoop.fs.FsShell.access$100(FsShell.java:49)
>>    at org.apache.hadoop.fs.FsShell$1.process(FsShell.java:351)
>>    at org.apache.hadoop.fs.FsShell 
>> $DelayedExceptionThrowing.globAndProcess(FsShell.java:1872)
>>    at org.apache.hadoop.fs.FsShell.cat(FsShell.java:345)
>>    at org.apache.hadoop.fs.FsShell.doall(FsShell.java:1519)
>>    at org.apache.hadoop.fs.FsShell.run(FsShell.java:1735)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
>>    at org.apache.hadoop.fs.FsShell.main(FsShell.java:1854)
>> 09/03/14 15:52:37 INFO hdfs.DFSClient: Could not obtain block
>> blk_-4992364814640383286_1013 from any node:  java.io.IOException: No
>> live nodes contain current block
>> 09/03/14 15:52:40 WARN hdfs.DFSClient: DFS Read: java.io.IOException:
>> BlockReader: error in packet header(chunkOffset : 415956992,  
>> dataLen :
>> 41284, seqno : 0 (last: -1))
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.readChunk(DFSClient.java:1186)
>>    at  
>> org. 
>> apache. 
>> hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:238)
>>    at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java: 
>> 190)
>>    at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java: 
>> 159)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $BlockReader.read(DFSClient.java:1060)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.readBuffer(DFSClient.java:1615)
>>    at org.apache.hadoop.hdfs.DFSClient 
>> $DFSInputStream.read(DFSClient.java:1665)
>>    at java.io.DataInputStream.read(DataInputStream.java:83)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:53)
>>    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:85)
>>    at org.apache.hadoop.fs.FsShell.printToStdout(FsShell.java:120)
>>    at org.apache.hadoop.fs.FsShell.access$100(FsShell.java:49)
>>    at org.apache.hadoop.fs.FsShell$1.process(FsShell.java:351)
>>    at org.apache.hadoop.fs.FsShell 
>> $DelayedExceptionThrowing.globAndProcess(FsShell.java:1872)
>>    at org.apache.hadoop.fs.FsShell.cat(FsShell.java:345)
>>    at org.apache.hadoop.fs.FsShell.doall(FsShell.java:1519)
>>    at org.apache.hadoop.fs.FsShell.run(FsShell.java:1735)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
>>    at org.apache.hadoop.fs.FsShell.main(FsShell.java:1854)
>> cat: BlockReader: error in packet header(chunkOffset : 415956992,
>> dataLen : 41284, seqno : 0 (last: -1))
>> ef8033a70b6691c2b99ad1c74583161a  -
>> [mra@sacws hadoop-0.19.1]$
>

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