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https://issues.apache.org/jira/browse/HAMA-359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034075#comment-13034075
]
Thomas Jungblut commented on HAMA-359:
--------------------------------------
{noformat}
2011-05-16 18:01:46,251 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460004
type:create cxid:0x45 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/findlay:61000 Error:KeeperErrorCode = NodeExists for
/bsp/findlay:61000
2011-05-16 18:03:31,892 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460001
type:create cxid:0x5b zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/raynor:61000 Error:KeeperErrorCode = NodeExists for /bsp/raynor:61000
2011-05-16 18:03:32,256 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460004
type:create cxid:0x4c zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/findlay:61000-data Error:KeeperErrorCode = NodeExists for
/bsp/findlay:61000-data
2011-05-16 18:03:32,407 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460001
type:create cxid:0x63 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/raynor:61000-data Error:KeeperErrorCode = NodeExists for
/bsp/raynor:61000-data
2011-05-16 18:03:32,448 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460004
type:create cxid:0x51 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/findlay:61000 Error:KeeperErrorCode = NodeExists for
/bsp/findlay:61000
2011-05-16 18:03:32,454 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460004
type:create cxid:0x53 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/findlay:61000-data Error:KeeperErrorCode = NodeExists for
/bsp/findlay:61000-data
2011-05-16 18:03:32,523 INFO org.apache.zookeeper.server.PrepRequestProcessor:
Got user-level KeeperException when processing sessionid:0x12ff96fd5460005
type:delete cxid:0x66 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error
Path:/bsp/horner:61000 Error:KeeperErrorCode = NoNode for /bsp/horner:61000
{noformat}
These are Zookeeper logs, that seems to be the problem. Job hangs until it gets
killed.
This here looks like a BIG flaw.
{noformat}
2011-05-16 17:32:07,230 INFO org.apache.hama.bsp.GroomServer: Lost connection
to BSP Master [raynor/192.168.1.1:9002]. Retrying...
java.util.ConcurrentModificationException
at
java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:373)
at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:392)
at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:391)
at org.apache.hama.bsp.GroomServer.offerService(GroomServer.java:374)
at org.apache.hama.bsp.GroomServer.run(GroomServer.java:609)
at java.lang.Thread.run(Thread.java:662)
{noformat}
That is the client side exception
{noformat}
2011-05-16 18:07:23,583 INFO org.apache.hadoop.ipc.Server: IPC Server handler 6
on 46733, call sync() from 127.0.0.1:50305: error: java.io.IOException:
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
for /bsp/findlay:61000
java.io.IOException: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = NoNode for /bsp/findlay:61000
at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:728)
at org.apache.hama.bsp.BSPPeer.leaveBarrier(BSPPeer.java:262)
at org.apache.hama.bsp.BSPPeer.sync(BSPPeer.java:203)
at org.apache.hama.bsp.GroomServer.sync(GroomServer.java:924)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:961)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:957)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:955)
{noformat}
> Development of Shortest Path Finding Algorithm
> ----------------------------------------------
>
> Key: HAMA-359
> URL: https://issues.apache.org/jira/browse/HAMA-359
> Project: Hama
> Issue Type: New Feature
> Components: examples
> Affects Versions: 0.2.0
> Reporter: Edward J. Yoon
> Assignee: Thomas Jungblut
> Labels: gsoc, gsoc2011, mentor
> Fix For: 0.3.0
>
> Attachments: HAMA-359-v2.patch, HAMA-359-v3.patch, HAMA-359-v4.patch,
> HAMA-359.patch, eddie.patch
>
> Original Estimate: 2016h
> Remaining Estimate: 2016h
>
> The goal of this project is development of parallel algorithm for finding a
> Shortest Path using Hama BSP.
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