[HADOOP-7542] Change XML format to 1.1 to add support for serializing additional characters

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.20.2
• Component/s: conf
• Hadoop Flags: Incompatible change
• Assignee: Michael Katzenellenbogen
• Reporter: Suhas
• Created: 13/Dec/08 00:36
• Updated: 23/Sep/12 10:54
• Resolved: 23/Sep/12 10:54

Description

Feature added by this Jira has a problem while setting up some of the invalid xml characters e.g. ctrl-A e.g. mapred.textoutputformat.separator = "\u0001"

e,g,
String delim = "\u0001";
Conf.set("mapred.textoutputformat.separator", delim);

Job client serializes the jobconf with mapred.textoutputformat.separator set to "\u0001" (ctrl-A) and problem happens when it is de-serialized (read back) by job tracker, where it encounters invalid xml character.

The test for this feature public : testFormatWithCustomSeparator() does not serialize the jobconf after adding the separator as ctrl-A and hence does not detect the specific problem.

Here is an exception:

08/12/06 01:40:50 INFO mapred.FileInputFormat: Total input paths to process : 1
org.apache.hadoop.ipc.RemoteException: java.io.IOException:
java.lang.RuntimeException: org.xml.sax.SAXParseException: Character reference "&#1" is an invalid XML
character.
at
org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:961)
at
org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:864)
at
org.apache.hadoop.conf.Configuration.getProps(Configuration.java:832)
at org.apache.hadoop.conf.Configuration.get(Configuration.java:291)
at
org.apache.hadoop.mapred.JobConf.getJobPriority(JobConf.java:1163)
at
org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:179)
at
org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:1783)
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$Server.call(RPC.java:452)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:888)

at org.apache.hadoop.ipc.Client.call(Client.java:715)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
at org.apache.hadoop.mapred.$Proxy1.submitJob(Unknown Source)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:788)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1026)
at

Issue Links

• is related to: HADOOP-3295 Allow TextOutputFormat to use configurable separators
• is superceded by: MAPREDUCE-4677 Text IF/OF separator character configuration should support passing non-XML-serializable characters