hmaster com

HMaster startup code analysis for source code analysis of HBase1.0.0 (2), hbase1.0.0hmaster In the previous blog, my code analysis is the startup function of the startMaster core. This article mainly analyzes the corresponding components involved in the specific HMaster construction process and the startup of services, this article mainly analyzes the process. The specific starting process of each part will

This article is based on HBase-0.94.1 analysis of the main class members of Hmaster.Hmaster is the central node in the HBase master/slave cluster architecture. Typically, an hbase cluster has multiple hmaster nodes, one of which is active master and the rest is Backup master.The main class members of Hmaster are as follows:1.ZooKeeper ListeningThese classes are inherited from Zookeeperlistener./************

HMaster startup code analysis for source code analysis of HBase1.0.0 (1), hbase1.0.0hmaster This article is not really about startup code parsing. This article mainly analyzes the startHMaster part from the startup process. This article will introduce HBase's pseudo-distributed debugging method for the first time. After we import the source code to Intellij IDE, we will get the following code structure: Here we go to hbase-server to add hadoop-metrics

In fact, this article is not really a start-up code parsing, this article is mainly from the start-up process analysis to the Starthmaster part, for the first time this article will be about HBase pseudo-distributed debugging methods related to the introduction.After we pour the source into the IntelliJ IDE, we get the following code structure:Here we go into the hbase-server and add hadoop-metrics2-hbase.properties,hbase-site.xml to the resources under Src/main, Log4j.properties and other files

Each hregion server communicates with the Hmaster server, and Hmaster's primary task is to tell each hregion server what hregion it is maintaining.When a new Hregion server logs on to the Hmaster server, Hmaster tells it to wait for the data to be allocated first .When a hregion crashes, Hmaster will mark its responsib

Not much to say, directly on the dry goods!Question DetailsAs shown in the scenario title, after HBase starts, the hmaster process starts and shuts down automatically after a few seconds, but the hregionserver process runs normally;Workaround:1, check the time of each machine is synchronized;2, check the firewall of each machine is closed;3. Check the log path of the HmasterBut soon after Hmaster will autom

you pull the hbase source and conversion maven project is automatically pulled is right, if not to go to the project directory input commands, other blog can be checked.Under what circumstances to ensure that the configuration is correct, you can start hmaster? All BuildPath folders on the diagram must be guaranteed, and the name directory must be identical.After the configuration file I feel can actually not set hbase.site, under Src/main/resources

After the Hadoop namenode reformat, restart HBase, find its hmaster process to disappear immediately after the start, look at a lot of logs, and finally found the following problems in the zookeeper logUnable to read additional data from client SessionID 0x14e86607c850007, likely client have closed socketWorkaround: Delete the hdfs-site.xml of hbase in the directory under the configured path of the content, restart the zookeeper cluster, and then rest

1. Similar to hadoop, configuration is required first for basic startup steps. 2 get the address of the hmaster hbaseconfiguration first add two profile hbase-core.xml hbase-default.xml under classpath Create hserveraddress (ADDR) This is nothing to say, it is to create a server. 3. Obtain the rootdir of hbase data based on the configuration file. Verify the directory, including version file data verification. 4. Check whether-root-region

Tags: default port address store zookeeper not modified serve root error1, the situation described title, HBase started, after the hmaster process started, a few seconds after the automatic shutdown, but the hregionserver process normal operation;The reason is that the default port number for HDFs is 8020, and I core-site.xml the port in HDFs to 9000.//hadoop1:9000/ However, we did not specify the port for HDFs, so after HBase started it went to the d

Since: http://www.vckbase.com/document/viewdoc? Id = 212 The purpose of this article is to provide a programming guide for programmers who have just come into contact with COM and help them understand the basic concepts of COM. The content includes the com standard introduction, important com terms, and how to reuse

Original: Http://www.codeproject.com/Articles/633/Introduction-to-COM-What-It-Is-and-How-to-Use-ItThe purpose of this article is to provide programming guidance to programmers who have just contacted COM and to help them understand the basic concepts of COM. The content includes a description of the COM specification ,

1, COM + Because of historical reasons, COM, DCOM and MTS are not very harmonious with each other, it is difficult to form a unified whole. COM + has effectively unified these three, forming a new, powerful component architecture. COM + is not a new version of COM, but a n

The purpose of this article is to provide programming guidance to programmers who have just contacted COM, and to help them understand the basic concepts of COM. The content includes a brief introduction to COM specifications, important COM terminology, and how to reuse existing CO