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https://issues.apache.org/jira/browse/HBASE-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946223#comment-14946223
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ramkrishna.s.vasudevan commented on HBASE-14557:
------------------------------------------------
Or we should remove NoTagsKeyValue and always go with KeyValue provided we
cache tagsLen or add a boolean to indicate if tags is present or not. If we
don't do it then caching the taglen is a costly operation. But this will have
concerns on increasing the heap size occupied by per KV and little more GC (not
sure on the impact of GC though).
> MapReduce WALPlayer issue with NoTagsKeyValue
> ---------------------------------------------
>
> Key: HBASE-14557
> URL: https://issues.apache.org/jira/browse/HBASE-14557
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Jerry He
>
> Running MapReduce WALPlayer to convert WAL info HFiles:
> {noformat}
> 15/10/05 20:28:08 INFO mapred.JobClient: Task Id :
> attempt_201508031611_0029_m_000000_0, Status : FAILED
> java.io.IOException: Type mismatch in value from map: expected
> org.apache.hadoop.hbase.KeyValue, recieved
> org.apache.hadoop.hbase.NoTagsKeyValue
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:997)
> at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:689)
> at
> org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
> at
> org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
> at
> org.apache.hadoop.hbase.mapreduce.WALPlayer$WALKeyValueMapper.map(WALPlayer.java:111)
> at
> org.apache.hadoop.hbase.mapreduce.WALPlayer$WALKeyValueMapper.map(WALPlayer.java:96)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:751)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:368)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at
> java.security.AccessController.doPrivileged(AccessController.java:369)
> at javax.security.auth.Subject.doAs(Subject.java:572)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1502)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {noformat}
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