Is this a blocker for 0.15?
On Oct 22, 2007, at 10:28 AM, Konstantin Shvachko (JIRA) wrote:
[ https://issues.apache.org/jira/browse/HADOOP-2087?
page=com.atlassian.jira.plugin.system.issuetabpanels:comment-
tabpanel#action_12536753 ]
Konstantin Shvachko commented on HADOOP-2087:
---------------------------------------------
I think the problem here is that Task
task_200710200555_0005_m_000725_0 failed and was killed while it
was creating a file.
Task task_200710200555_0005_m_000725_1 was started to create the
same file, but the lease issued for task _0 had not expired yet.
If task _1 waited for not more than 60 seconds, the lease would
expire and it would be able to claim a new lease for this file.
I think the client should retry file creation if
AlreadyBeingCreatedException is caught.
Errors for subsequent requests for file creation after original
DFSClient goes down..
---------------------------------------------------------------------
----------------
Key: HADOOP-2087
URL: https://issues.apache.org/jira/browse/
HADOOP-2087
Project: Hadoop
Issue Type: Bug
Components: dfs
Reporter: Gautam Kowshik
Fix For: 0.15.0
task task_200710200555_0005_m_000725_0 started writing a file and
the Node went down.. so all following file creation attempts were
returned with AlreadyBeingCreatedException
I think the dfs should handle cases wherein, if a dfsclient goes
down between file creation, subsequent creates to the same file
could be allowed.
2007-10-20 06:23:51,189 INFO
org.apache.hadoop.mapred.TaskInProgress: Error from
task_200710200555_0005_m_000725_0: Task
task_200710200555_0005_m_000725_0 failed to report status for 606
seconds. Killing!
2007-10-20 06:23:51,189 INFO org.apache.hadoop.mapred.JobTracker:
Removed completed task 'task_200710200555_0005_m_000725_0' from
'[tracker_address]:/127.0.0.1:44198'
2007-10-20 06:23:51,209 INFO
org.apache.hadoop.mapred.JobInProgress: Choosing normal task
tip_200710200555_0005_m_000725
2007-10-20 06:23:51,209 INFO org.apache.hadoop.mapred.JobTracker:
Adding task 'task_200710200555_0005_m_000725_1' to tip
tip_200710200555_0005_m_000725, for tracker '[tracker_address]:/
127.0.0.1:50914'
2007-10-20 06:28:54,991 INFO
org.apache.hadoop.mapred.TaskInProgress: Error from
task_200710200555_0005_m_000725_1:
org.apache.hadoop.ipc.RemoteException:
org.apache.hadoop.dfs.AlreadyBeingCreatedException: failed to
create file /benchmarks/TestDFSIO/io_data/test_io_825 for
DFSClient_task_200710200555_0005_m_000725_1 on client
72.30.50.198, because this file is already being created by
DFSClient_task_200710200555_0005_m_000725_0 on 72.30.53.224
at org.apache.hadoop.dfs.FSNamesystem.startFileInternal
(FSNamesystem.java:881)
at org.apache.hadoop.dfs.FSNamesystem.startFile
(FSNamesystem.java:806)
at org.apache.hadoop.dfs.NameNode.create(NameNode.java:276)
at sun.reflect.GeneratedMethodAccessor10.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$Server.call(RPC.java:379)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
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