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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1093) NNBench generates millions of NotReplicatedYetException in Namenode log
Date Tue, 10 Apr 2007 18:45:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487879
] 

Konstantin Shvachko commented on HADOOP-1093:
---------------------------------------------

It needs minor comment correction
<DataNode>
// we writing to local disk in parallel.
^^^^^

<FSNamesystem>
     * each block, otherwise check only last block.

Unused method
      public Block getLastBlock() {

On my comment #4. I think it worth doing what Dhruba proposed, namely to
first send data over the network, and then to write it to local disk. That way
local writes will happen almost simultaneously on all data-nodes to which the
block was transferred.


> NNBench generates millions of NotReplicatedYetException in Namenode log
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-1093
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1093
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.12.0
>            Reporter: Nigel Daley
>         Assigned To: dhruba borthakur
>             Fix For: 0.13.0
>
>         Attachments: nyr3.patch
>
>
> Running NNBench on latest trunk (0.12.1 candidate) on a few hundred nodes yielded 2.3
million of these exceptions in the NN log:
>    2007-03-08 09:23:03,053 INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on
8020 call error:
>    org.apache.hadoop.dfs.NotReplicatedYetException: Not replicated yet
>         at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:803)
>         at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java:309)
>         at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:336)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:559)
> I run NNBench to create files with block size set to 1 and replication set to 1.  NNBench
then writes 1 byte to the file.  Minimum replication for the cluster is the default, ie 1.
 If it encounters an exception while trying to do either the create or write operations, it
loops and tries again.  Multiply this by 1000 files per node and a few hundred nodes.

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