Can anyone point me to a reference or provide a high level overview of how companies like Facebook, Yahoo, Google, etc al perform the large scale (e.g. multi-TB range) log analysis ... |
I'm having a problem with Hadoop producing too many log files in $HADOOP_LOG_DIR/userlogs (the Ext3 filesystem allows only 32000 subdirectories) which looks like the same problem in this question: http://stackoverflow.com/questions/2091287/error-in-hadoop-mapreduce
My ... |
I have a requirement of parsing both Apache access logs and tomcat logs one after another using map reduce. Few fields are being extracted from tomcat log and rest from Apache ... |
I am trying to debug the WordCount example of Cloudera Hadoop but I can't. I've logged the mapper and the reducer class, but in the console doesn't appear the log.
I attach ... |
I am trying to work with hadoop built from source in a single cluster mode.I checked out 0.22.0-alpha-1.I am facing few problems with logging.
How do i enable debug logs.
I tried adding
log4j.logger.org.apache.hadoop.mapred.JobTracker=DEBUG
log4j.logger.org.apache.hadoop.mapred.TaskTracker=DEBUG ...
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I start a job on a Hadoop cluster using JobClient, which gives me a handle to a RunningJob. Is there a painless way to get the log output of just that ... |
We store our logs in S3, and one of our (Pig) queries would grab three different log types. Each log type is in sets of subdirectories based upon type/date. For instance:
/logs/<type>/<year>/<month>/<day>/<hour>/lots_of_logs_for_this_hour_and_type.log*
my ... |
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We need as part of our start-up product to compute "similar user feature". And we've decided to go with pig for it.
I've been learning pig for a few days now and ... |
I am looking for a way to store some log information into a single log file in HDFS. That is different workers in Hadoop will dump the log information into a ... |
Flume generates log in /var/log/flume folder.
The files there are growing in GBs. How to limit the file size for these logs?
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I'm trying to do some log processing using Apache Pig Latin, and I was wondering if there was an easier way to do this:
filtered_logs = FOREACH logs GENERATE numDay, reqSize, optimizedSize, ...
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How can I log messages from Hadoop Mapper (or Combiner/Reducer/whatever) so that I'd find these custom messages in Hadoop logs later?
public class GfimlMapper extends Mapper<Object, Text, Text, RawTerm>
{
...
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I was writing shell script that will run many hadoop jobs (possibly overnight) for performance purposes. I don't know how to tell Hadoop to write each map and reduce log information ... |
I modified the $HADOOP_HOME/conf/log4j.properies
But it is not working as what I expect.
How to solve this problem?
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These are the Hadoop Logging Message I was trying to surpress
11/10/17 19:42:23 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
11/10/17 19:42:23 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
11/10/17 19:42:23 INFO mapred.MapTask: soft limit at 83886080
11/10/17 19:42:23 ...
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Is there a way to output to log the intermediate (Map Phase) output of a MapReduce Job without editing the Application? (The application is not mine, but the cluster is, and ... |
I need to write some data to HDFS file system using flume. How this is possible. I am using ubuntu 11.10
thnx
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