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Posted to common-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2009/03/26 18:39:02 UTC
[jira] Commented: (HADOOP-5584) DFSClient continues to retry
indefinitely
[ https://issues.apache.org/jira/browse/HADOOP-5584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689566#action_12689566 ]
Hairong Kuang commented on HADOOP-5584:
---------------------------------------
Although the negative retry number is misleading, it seems to me retrying forever when allocating a new block is a policy when a previous block in a file being created does not meet the minimum replication factor. DFS does the same for close. Close retries forever if any of blocks in the file does not meet the minimum replication factor. Retrying forever may not be a good policy. A dfs client should retry a finite times and then declare a failure to the client.
> DFSClient continues to retry indefinitely
> -----------------------------------------
>
> Key: HADOOP-5584
> URL: https://issues.apache.org/jira/browse/HADOOP-5584
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.19.1
> Reporter: Derek Wollenstein
> Priority: Minor
>
> I encountered a bug when trying to upload data using the Hadoop DFS Client.
> After receiving a NotReplicatedYetException, the DFSClient will normally retry its upload up to some limited number of times. In this case, I found that this retry loop continued indefinitely, to the point that the number of tries remaining was negative:
> 2009-03-25 16:20:02 [INFO]
> 2009-03-25 16:20:02 [INFO] 09/03/25 16:20:02 INFO hdfs.DFSClient: Waiting for replication for 21 seconds
> 2009-03-25 16:20:03 [INFO] 09/03/25 16:20:02 WARN hdfs.DFSClient: NotReplicatedYetException sleeping /apollo/env/SummaryMySQL/var/logstore/fiorello_logs_2009
> 0325_us/logs_20090325_us_13 retries left -1
> The stack trace for the failure that's retrying is:
> 2009-03-25 16:20:02 [INFO] 09/03/25 16:20:02 INFO hdfs.DFSClient: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.NotReplicated
> YetException: Not replicated yet:<filename>
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1266)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:351)
> 2009-03-25 16:20:02 [INFO] at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
> 2009-03-25 16:20:02 [INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 2009-03-25 16:20:02 [INFO] at java.lang.reflect.Method.invoke(Method.java:597)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:481)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.ipc.Server$Handler.run(Server.java:894)
> 2009-03-25 16:20:02 [INFO]
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.ipc.Client.call(Client.java:697)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
> 2009-03-25 16:20:02 [INFO] at $Proxy0.addBlock(Unknown Source)
> 2009-03-25 16:20:02 [INFO] at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> 2009-03-25 16:20:02 [INFO] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 2009-03-25 16:20:02 [INFO] at java.lang.reflect.Method.invoke(Method.java:597)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
> 2009-03-25 16:20:02 [INFO] at $Proxy0.addBlock(Unknown Source)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2814)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2696)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:1996)
> 2009-03-25 16:20:02 [INFO] at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2183)
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