hbase

问题 I am creating a Graph Data Table using Titan and Blueprint API. I am using HBase as backend. I know how to define data types for key indexes. Example: TitanKey name = graph.makeType().name("name").dataType(String.class).functional().makePropertyKey(); Now I actually want to represent a RDBMS Table in Titan DB Graph. Is there any process through which I can implement 'Column Data Type' (as in RDBMS Table) in the Titan Graph Model ? 回答1: Unlike a relational database, Titan's schema is flexible.

问题 I am creating a Graph Data Table using Titan and Blueprint API. I am using HBase as backend. I know how to define data types for key indexes. Example: TitanKey name = graph.makeType().name("name").dataType(String.class).functional().makePropertyKey(); Now I actually want to represent a RDBMS Table in Titan DB Graph. Is there any process through which I can implement 'Column Data Type' (as in RDBMS Table) in the Titan Graph Model ? 回答1: Unlike a relational database, Titan's schema is flexible.

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . My Hadoop muti node cluster has 3 nodes, one namenode and two datanodes, I am using Hbase for storing data, due to some reasons I want to change default ssh port number which I know how to do, but if I change that, what configuration changes I will have to make in hadoop and hbase? I saw link , this link just

问题 Using Hbase API (Get/Put) or HBQL API, is it possible to retrieve timestamp of a particular column? 回答1: Assuming your client is configured and you have a table setup. Doing a get returns a Result Get get = new Get(Bytes.toBytes("row_key")); Result result_foo = table.get(get); A Result is backed by a KeyValue. KeyValues contain the timestamps. You can get either a list of KeyValues with list() or get an array with raw(). A KeyValue has a get timestamp method. result_foo.raw()[0].getTimestamp(

问题 I am working on a batch job to process a batch of Put objects into HBase through HTableInterface. There are two API methods, HTableInterface.put(List) and HTableInterface.put(Put). I am wondering, for the same number of Put objects, is the batch put faster than putting them one by one? Another question is, I am putting a very large Put object, which caused the job to fail. There seems a limit on the size of a Put object. How large can it be? 回答1: put(List<Put> puts) or put(Put aPut) are the

问题 Does anybody know a tutorial how HBase can be run on Windows under Cygwin? I managed to setup everything such as the keys for auto login with SSH but Im stuck with following error message: localhost: +======================================================================+ localhost: | Error: JAVA_HOME is not set and Java could not be found | localhost: +----------------------------------------------------------------------+ localhost: | Please download the latest Sun JDK from the Sun Java web

问题 EDIT: This question and answer applies to anyone who is experiencing the exception stated in the subject line: TTransportException(type=4, message='TSocket read 0 bytes') ; whether or not Cloudera and/or HappyBase is involved. The root issue (as it turned out) stems from mismatching protocol and/or transport formats on the client-side with what the server-side is implementing, and this can happen with any client/server paring. Mine just happened to be Cloudera and HappyBase, but yours needn't

问题 I have a small sample code in which I try to establish a connection to a remote HBase entity. The code runs on a windows machine without HBase installed and I try to connect to a remote Ubuntu Server that has it installed and running. The IP in the below snippet is of course just a placeholder. The code is as follows: public static void main(String[] args) { Configuration conf = HBaseConfiguration.create(); HBaseAdmin admin = null; String ip = "10.10.10.10"; String port = "2181"; conf.set(

问题 I have a small sample code in which I try to establish a connection to a remote HBase entity. The code runs on a windows machine without HBase installed and I try to connect to a remote Ubuntu Server that has it installed and running. The IP in the below snippet is of course just a placeholder. The code is as follows: public static void main(String[] args) { Configuration conf = HBaseConfiguration.create(); HBaseAdmin admin = null; String ip = "10.10.10.10"; String port = "2181"; conf.set(

问题 When does it make sense to create multiple tables as opposed to a single table with a large number of columns. I understand that typically tables have only a few column families (1-2) and that each column family can support 1000+ columns. When does it make sense to create separate tables when HBase seems to perform well with a potentially large number of columns within a single table? 回答1: Before answering the question itself, let me first state some of the major factors that come into play.