Attila Sasvari created OOZIE-2791:
-------------------------------------
Summary: ShareLib installation may fail on busy Hadoop clusters
Key: OOZIE-2791
URL: https://issues.apache.org/jira/browse/OOZIE-2791
Project: Oozie
Issue Type: Bug
Reporter: Attila Sasvari
On a busy Hadoop cluster it can happen that users cannot install properly
Oozie ShareLib.
Example on a Hadoop 2.4.0 pseudo cluster sharelib installion with a
concurrency number set high (to simulate a busy cluster):
{code}
oozie-setup.sh sharelib create -fs hdfs://localhost:9000 -locallib
oozie-sharelib-*.tar.gz -concurrency 150
{code}
You can see a lot of errors (failed copy tasks) on the output:
{code}
Running 464 copy tasks on 150 threads
Error: Copy task failed with exception
Stack trace for the error was (for debug purposes):
--------------------------------------
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File
/user/asasvari/share/lib/lib_20170207105926/distcp/hadoop-distcp-2.4.0.jar
could only be replicated to 0 nodes instead of minReplication (=1). There are
1 datanode(s) running and no node(s) are excluded in this operation.
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1430)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2684)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:584)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:440)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007)
at org.apache.hadoop.ipc.Client.call(Client.java:1410)
at org.apache.hadoop.ipc.Client.call(Client.java:1363)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:190)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:103)
at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:361)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1439)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1261)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:525)
--------------------------------------
...
{code}
You can see file is created but it's size is 0.
{code}
-rw-r--r-- 3 asasvari supergroup 0 2017-02-07 10:59
share/lib/lib_20170207105926/distcp/hadoop-distcp-2.4.0.jar
{code}
This behaviour is clearly wrong.
In case of such an exception, we should retry copying or rollback changes. We
should also consider throttling HDFS requests.
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