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How CouchBase achieves powerful consistency

I searched for an explanation of how Couchbase achieves strong consistency within the cluster. Are all these results of using membase? Couchbase IS membase btw. Couchbase IS membase btw. Couchba

October 12, 2021By Simo Hadoop Consistency, Couchbase, How, implement, powerfulLeave a Comment

Hadoop – How to make S3DISTCP complies with the wrap

I have millions of small one-line s3 files that I want to merge together. I have s3distcp syntax, but I found that after merging the files, the merged set does not contain newline characters.

October 12, 2021By Simo Hadoop DISTCP, Hadoop, How, Merge, newline, S3DistCPLeave a Comment

Hibernate – How do I work in the JPQL WHERE clause?

How to evaluate entity comparison (equal) statements in JPQL: Is it through identity comparison, equals() or something else?

I spent a few hours Googling and completed the Hibernate and JPA s

October 12, 2021By Simo Hibernate clause, comparison, entity, Hibernate, How, JPQL, Medium, PlayLeave a Comment

How to read the ORC file in the Hadoop stream?

I want to read the ORC file in mapreduce on Python. I try to run it:

hadoop jar /usr /lib/hadoop/lib/hadoop-streaming-2.6.0.2.2.6.0-2800.jar
-file /hdfs/price/mymapper.py
-mapper’/usr/local

October 12, 2021By Simo Hadoop file, Flow, Hadoop, How, Medium, ORC, readLeave a Comment

Hibernate – How to set up the biggest result in DetachedCriteria?

I am using DetachedCriteria, I only want the first result of the query, so I want to do something like LIMIT in DetachedCriteria 1. When I search Google, I found setMaxResult but It’s standard.

October 12, 2021By Simo Hibernate DetachedCriteria, Hibernate, How, maximum, Results, settingLeave a Comment

Hadoop – How to Create a Spark DataFrame from Sequencefile

I am using spark 1.5. I want to create a data frame from a file in HDFS. The HDFS file contains json data with a large number of fields in a sequence input file format.

Is there a way to do t

October 12, 2021By Simo Hadoop create, DataFrame, Hadoop, How, Sequencefile, SPARKLeave a Comment

Hibernate how to use constants as part of the composite external reference

I have a main table A, which contains a composite primary key, composed of two columns. One of the columns is a constant (“constant value” in the code below). This table is defined as follows Show: