[ https://issues.apache.org/jira/browse/MAPREDUCE-5055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Deepesh Khandelwal updated MAPREDUCE-5055: ------------------------------------------ Attachment: RandomWriter.java Attaching the modified code to reproduce. > Binary compatibility for the method Reporter.incrCounter(String group, String > counter, long amount) between hadoop-1.x and hadoop-2.x > ------------------------------------------------------------------------------------------------------------------------------------- > > Key: MAPREDUCE-5055 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5055 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Affects Versions: 2.0.3-alpha > Environment: Linux > Reporter: Deepesh Khandelwal > Attachments: RandomWriter.java > > > Try to generate a lot of counters that exceed the default max limit so the > job errors. > To simulate this edit org.apache.hadoop.examples.RandomWriter class and add > the following in the mapper: > {code} > for (int i = 0; i < 150; i++) { > reporter.incrCounter("StringCounter", "counter" + i, 1L); > } > {code} > Attached is the modified code of RandomWriter.java from branch-1. > When I run it against branch-1, > {code} > hadoop jar build/hadoop-examples-1.2.0-SNAPSHOT.jar > -Dtest.randomwrite.total_bytes=8 rw2 > {code} > it fails with the following error: > {code} > java.lang.Exception: > org.apache.hadoop.mapred.Counters$CountersExceededException: Error: Exceeded > limits on number of counters - Counters=120 Limit=120 > {code} > Using the jar compiled with branch-1 when running in a hadoop 2 cluster > completes without any error and don't see the counter. Interestingly there > were two more custom counters in the same job that are incremented and they > are visible. The difference is that they use the method > Reporter.incrCounter(Enum<?> key, long amount). > Compiled this against 2.x/trunk and ran it. The job did fail with the > expected counter exceeded exception. So it seems to be a case of binary > incompatibility between 1.x and 2.x. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira