Mapreduce - Related information

• How does spark calculate the difference between the two pieces of data (kafka data source)?

  the data source is kafka, and a field is a timestamp. We want to calculate the difference between the timestamps of the two pieces of data, and then add a new field to store this value and send it out. I checked. Do you want to reducebykeyandwindow? Wit...

  Kafka mapreduce spark spark-streaming

  Apr.20,2022
• 6.824 execution use case error debug call has arguments but no formatting directives

  execute go test command to report an error. What does it mean? debug call has arguments but no formatting directives in addition, what does the xxx stand for after go test-run xxx mean? check it out and see no clear statement ...

  Mapreduce golang

  Feb.16,2022
• MapReduce Job executes error File file job.jar does not exist

  I try to run the main method directly in java to submit the job to yarn for execution. But get the following error message: 2018-08-26 10:25:37,544 INFO [main] mapreduce.Job (Job.java:monitorAndPrintJob(1375)) - Job job_1535213323614_0010 failed with ...

  Yarn mapreduce hadoop

  Apr.29,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-249c983-2f3b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-249c983-2f3b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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