task fails with NPE when GzipCodec is used for mapred.map.output.compression.codec and native libary is not present --------------------------------------------------------------------------------------------------------------------
Key: MAPREDUCE-857 URL: https://issues.apache.org/jira/browse/MAPREDUCE-857 Project: Hadoop Map/Reduce Issue Type: Bug Components: task Reporter: Karam Singh Fix For: 0.21.0 Ran a job with mapred.map.output.compression.codec=org.apache.hadoop.io.compress.GzipCodec. Whenmaps of job completes they with following NPE -: tasklog -: 2009-08-12 13:48:13,423 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb = 256 2009-08-12 13:48:13,611 INFO org.apache.hadoop.mapred.MapTask: data buffer = 204010944/214748368 2009-08-12 13:48:13,611 INFO org.apache.hadoop.mapred.MapTask: record buffer = 3187670/3355443 2009-08-12 13:49:45,473 INFO org.apache.hadoop.mapred.MapTask: Starting flush of map output 2009-08-12 13:49:45,544 WARN org.apache.hadoop.util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 2009-08-12 13:49:45,545 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new compressor 2009-08-12 13:49:45,546 WARN org.apache.hadoop.mapred.Child: Error running child : java.lang.NullPointerException at org.apache.hadoop.mapred.IFile$Writer.<init>(IFile.java:105) at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1248) at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1146) at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:528) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:604) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:318) at org.apache.hadoop.mapred.Child.main(Child.java:162) Line 105 of IFile.java contains followings line in trunk code on which error was seen -: Line 104: this.compressor = CodecPool.getCompressor(codec); Line: this.compressor.reset(); If native is available job runs successfully without any failures -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.