[HADOOP-2141] speculative execution start up condition based on completion time

We had one job with speculative execution hang. 4 reduce tasks were stuck with 95% completion because of a bad disk. Devaraj pointed out bq . One of the conditions that must be met for...

[HADOOP-1127] Speculative Execution and output of Reduce tasks - ASF JIRA

We've recently seen instances where jobs run with 'speculative execution' tend to be quite unstable and fail with AlreadyBeingCreatedException noticed at the NameNode. Also potentially we...

[HADOOP-2391] Speculative Execution race condition with output paths - ASF JIRA

I am tracking a problem where when speculative execution is enabled, there is a race... Here is an error when supports my theory: Generator: org.apache.hadoop.ipc.RemoteException: java.io....

Hive 투기적 실행(Speculative execution) - Data Science Lab

Hive 투기적 실행(Speculative execution) · Version : Hive Hive에서 투기적 실행(Speculative execution)이라 불리는 기능은 하나의 잡을 중복된 태스크로 구성하여 동시에 수행 시키는 하둡의 기능이다. 같은 데이터를 중복하여 복사하기 때문에 더 많은 리소스를 사용하며, 대부분의 데이터는 버려진다. 이...

Job (Apache Hadoop Main 3.3.1 API)

The job submitter's view of the Job. It allows the user to configure the job, submit it, control its execution, and query the state. The set methods only work until the job is submitted, afterwards they will throw an IllegalStateException. Normally the user creates the application, describes various facets of the job via Job and then submits the job and monitor its progress. Here is an example on how to submit a job:

Combining User Interaction, Speculative Query Execution and Sampling in the DICE

This creates a challenge for our speculative execution tech- nique – which queries do we pick? Thus, we present a model where the user explores the cube in a series of faceted traversals...

Apache Hadoop - 위키피디아 영어

Apache Hadoop Original author(s) Doug Cutting , Mike... 4 months ago [2] Repository Hadoop Repository Written in Java... 0 Website hadoop.apache.org Apache Hadoop ( /həˈduːp/) is a...

[논문]Study of an Improved Hadoop Speculative Execution Algorithm

Advances in materials science and information technologies in industry; Applied science, materials science and information technologies in industry: selected peer reviewed papers from the 2014...

hadoop - How does speculative execution impact s3-dist-cp job? - Stack Overflow

I have noticed that sometimes s3-dist-cp takes much longer than usual due to a "slow node" issue. In case of spark I have enabled speculative execution which works fine. Howerver, when it...

[HADOOP-76] Implement speculative re-execution of reduces - ASF JIRA

I've tried to implement speculative reduces and it seems to be working, however I'd like you to take a look at it since I'm not familiar with some of the inner workings of hadoop. As...