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Resolved] (HDFS-380) support for persistent connections to improve random read performance.
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| Jun 5, 2011 | |||||
 Todd Lipcon (JIRA) |
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How to improve random read latency? May 29, 2011 03:24:42 PM Are there any configurations that I need to set to improve read latency? I'm running HBase on 10 ec2 m1.large instances (7.5GB RAM). Also, as the size of the data gets bigger is it normal to get higher latency for reads? I'm testing out the YCSB… improving random read performance August 19, 2010 07:53:57 PM I am currently running under Hbasev0.20.3. I increased the block cache to .4 from .2. The heap size is 2GB. The default regionserver handler count is 25 in hbase-default.xml. Will try LZO compression. What are other performance tunings I can do ?… improve read performance for read-only store February 10, 2011 07:19:37 PM Hi, I have deployed 2 application in production using Voldemort and am concentrating on performance and monitoring now. I have been going through the discussions on this group looking for fine-tuning server/ client configuration or any other tips… Re: improve read performance for read-only store February 21, 2011 12:24:43 AM Hi Anani, >>> I have deployed 2 application in production using Voldemort and am >>> concentrating on performance and monitoring now. I have been going >>> through the discussions on this group looking for fine-tuning… The hfile.block.cache.size = 0 performance is better than default(0.2) in random read? Is it possibl October 20, 2010 10:19:49 PM Hi all, I run my performance testing in random read, but I got the hfile.block.cache.size = 0 performance is better than default, Is it possible? My cluster (4 nodes): Hadoop 0.20.2, HBase 0.20.6 1 * namenode & hmaster & zookeeper 3… The hfile.block.cache.size = 0 performance is better than default(0.2) in random read? Is it possibl October 20, 2010 10:19:49 PM Hi all, I run my performance testing in random read, but I got the hfile.block.cache.size = 0 performance is better than default, Is it possible? My cluster (4 nodes): Hadoop 0.20.2, HBase 0.20.6 1 * namenode & hmaster & zookeeper 3… Created: (HDFS-1571) Improve performance of audit log January 5, 2011 09:14:32 PM Improve performance of audit log Created: (HDFS-1458) Improve checkpoint performance by avoiding uncessary image downloads October 14, 2010 03:23:01 PM Improve checkpoint performance by avoiding uncessary image downloads Created: (HDFS-1583) Improve backup-node sync performance by wrapping RPC parameters January 12, 2011 11:49:14 PM Improve backup-node sync performance by wrapping RPC parameters Resolved: (DERBY-4241) Improve transition from read-only to writable Clob representation June 28, 2010 04:54:50 AM [ https://issues.apache.org/jira/browse/DERBY-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Kristian Waagan resolved DERBY-4241. Resolved: (HDFS-1160) Improve some FSDataset warnings and comments November 12, 2010 12:31:40 PM [ https://issues.apache.org/jira/browse/HDFS-1160?page=com.atlassian.jir a.plugin.system.issuetabpanels:all-tabpanel ] Eli Collins resolved HDFS-1160. Resolved: (HDFS-1055) Improve thread naming for DataXceivers November 16, 2010 06:56:04 PM [ https://issues.apache.org/jira/browse/HDFS-1055?page=com.atlassian.jir a.plugin.system.issuetabpanels:all-tabpanel ] Eli Collins resolved HDFS-1055. Resolved] (HDFS-1062) Improve error messages for failed completeFile May 11, 2011 02:04:51 PM [ https://issues.apache.org/jira/browse/HDFS-1062?page=com.atlassian.jir a.plugin.system.issuetabpanels:all-tabpanel ] Jonathan Hsieh resolved HDFS-1062. Created: (FELIX-2595) Improve sigil boot performance by cacheing resolved classpath in filesystem be September 11, 2010 12:31:15 AM Improve sigil boot performance by cacheing resolved classpath in filesystem between restarts Closed: (FELIX-2595) Improve sigil boot performance by cacheing resolved classpath in filesystem bet September 11, 2010 12:30:59 AM [ https://issues.apache.org/jira/browse/FELIX-2595?page=com.atlassian.ji ra.plugin.system.issuetabpanels:all-tabpanel ] David Savage closed FELIX-2595. PHP-FPM and Persistent Connections June 2, 2011 02:10:15 AM I've recently been doing load testing on an app that is using PHP and MongoDB. Here is some background: - 20000 connection limit (ulimit -n 1000000) - Nginx + PHP-FPM + 5.3.6 + APC - Persistent Connections - No replication at the moment - 8 Cores… Resolved] (HDFS-1392) Improve namenode scalability by prioritizing datanode heartbeats over block re March 29, 2011 11:27:50 PM [ https://issues.apache.org/jira/browse/HDFS-1392?page=com.atlassian.jir a.plugin.system.issuetabpanels:all-tabpanel ] dhruba borthakur resolved HDFS-1392. PyMongo connections - master->read/write, slave->read only March 9, 2011 06:47:19 PM We have a standard, 3 box replica set that houses all of our production data and we would like to spread the reads out to the slave nodes and writes only to the master. I briefly took a look at the code and it appears that the 'slave_okay' option… Mongos and Persistent Connections February 3, 2011 07:53:37 AM If I have one instance of mongos running on each of my webservers, and they're all pointing to a server dedicated to running mongod, how are PHP's persistent connections handled? Will just the connections to localhost on the webservers be made… Resolved: (HDFS-523) Create performance/scalability tests for append feature January 5, 2011 10:55:12 AM [ https://issues.apache.org/jira/browse/HDFS-523?page=com.atlassian.jira .plugin.system.issuetabpanels:all-tabpanel ] Konstantin Boudnik resolved HDFS-523. Does Drupal support persistent DB connections? February 15, 2011 Does Drupal support persistent DB connections? If yes, how do you set them up and what are the downsides? If no,... why not? PHP and persistent connections. December 26, 2010 Whenever I open a persistent connection to the DB , if the DB daemon crashes and is then restarted, 30% of new connections to the daemon will result… ASP .NET to MySQL: Are persistent connections possible? How? December 28, 2010 Is it possible from ASP .NET through the latest MySQL .NET connector to use persistent connections? I've experimented with this several times, but… Commercial support for hbase/hdfs February 1, 2011 I know cloudera is on the forefront of providing commercial support for hadoop/hbase/hdfs. Are there any other vendors who provide this? -Chinmay Pion::net HTTPServer persistent connections May 3, 2011 Hi! I'm working on a low-latency high-throughput, minimalistic HTTP server (almost real-time message switch). I'm very fond of pion::net, and I've… MySQL 5.5 performance schema is to monitor performance not to improve right? April 26, 2011 Hi Guys, According to my perception Mysql5.5 performance schema feature is to monitor the performance but not to improve. Am i right? Requires yours… How to change timeout for mysql persistent connections February 9, 2011 hello, where is defined timeout of persistent connections? it is possible to change it? tnx in adv! Trouble understanding persistent http connections in c# April 19, 2011 Hi everyone, I do not quite understand how exactly persistent connections work. So the keepalive property is set by default and this should keep my… How to read a file from HDFS in a non-Java client February 18, 2011 So my MR Job generates a report file, and that file needs to be able to be downloaded by an end-user who needs to click a button on a normal web… Will using Apache's ProxyPass directive on persistent Ajax connections alleviate the connection limit error? March 15, 2011 I've got some javascript that keeps a persistent Ajax connection open for each client, and I know that this can cause some serious issues for… How do I improve these queries' performance? March 19, 2011 I have a long complicated home page where a company is shown, for each project , information about recent events . The idea is that they have a kind… Is there any way to improve the GROUP BY performance on this? April 19, 2011 I have a simple problem, or at least the symptom of the problem is simple. The following query is lightning-fast without the GROUP BY (0.15 seconds)… Improve SQL query performance January 14, 2011 I have three tables where I store actual person data ( person ), teams ( team ) and entries ( athlete ). The schema of the three tables is: In each… What should be indexed to improve performance? May 28, 2011 Given this query, which column or columns should be indexed to optimize query performance? SELECT * FROM `activities` WHERE (user_id = 90000 AND… Why doesn't Hadoop file system support random I/O? April 24, 2011 The distributed file systems which like Google File System and Hadoop doesn't support random I/O. (It can't modify the file which were written… How can I improve my INSERT statement performance? March 27, 2011 While Josh's answer here gave me a good head start on how to insert a 256x64x250 value array into a MySQL database. When I actually tried his INSERT… How to improve Postgresql 'truncate' performance? May 27, 2011 I am having a problem with truncating all tables in the database on my local machine running Ubuntu 10.09 and Postgresql 9.0 on ext4 fs. Truncating… How can i improve the performance of the sqllite database? April 26, 2011 Background: I am using sqllite database in my flex application. Size of the database is 4 MB and have 5 tables which are table 1 have 2500 records… How to improve Postfix+Dovecot performance? April 20, 2011 Hi people! I have 3 dedicated servers: 1 for App (PHP, Python), 1 for Databases (MySQL) and 1 for MTA (Postfix) I'm using Interspire Email Marketer… How to improve query performance with operators like $nin, $in for Mongodb May 18, 2011 I have a reasonably large dataset of over 3 million documents that have tags similar to StackOverflow that uses tags for each question. The schema… | |||||