[jira] [Updated] (HDFS-1323) Pool/share file channels for HDFS read
[ https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Todd Lipcon updated HDFS-1323: -- Component/s: performance > Pool/share file channels for HDFS read > -- > > Key: HDFS-1323 > URL: https://issues.apache.org/jira/browse/HDFS-1323 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node, performance >Reporter: Jay Booth > Attachments: hdfs-1323-20100730.patch, hdfs-1323-trunk.txt > > > Currently, all reads in HDFS require opening and closing the underlying > block/meta filechannels. We could pool these filechannels and save some > system calls and other work. Since HDFS read requests can be satisfied by > positioned reads and transferTos, we can even share these filechannels > between concurrently executing requests. > The attached patch was benchmarked as part of work on HDFS-918 and exhibited > a 10% performance increase for small random reads. > This does not affect client logic and involves minimal change to server > logic. Patch is based on branch 20-append. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (HDFS-1323) Pool/share file channels for HDFS read
[ https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Todd Lipcon updated HDFS-1323: -- Status: Open (was: Patch Available) looks like this needs some more work based on failing tests above. Anyone want to volunteer to help push this over the finish line? > Pool/share file channels for HDFS read > -- > > Key: HDFS-1323 > URL: https://issues.apache.org/jira/browse/HDFS-1323 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node >Reporter: Jay Booth > Attachments: hdfs-1323-20100730.patch, hdfs-1323-trunk.txt > > > Currently, all reads in HDFS require opening and closing the underlying > block/meta filechannels. We could pool these filechannels and save some > system calls and other work. Since HDFS read requests can be satisfied by > positioned reads and transferTos, we can even share these filechannels > between concurrently executing requests. > The attached patch was benchmarked as part of work on HDFS-918 and exhibited > a 10% performance increase for small random reads. > This does not affect client logic and involves minimal change to server > logic. Patch is based on branch 20-append. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (HDFS-1323) Pool/share file channels for HDFS read
[ https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Todd Lipcon updated HDFS-1323: -- Status: Patch Available (was: Open) > Pool/share file channels for HDFS read > -- > > Key: HDFS-1323 > URL: https://issues.apache.org/jira/browse/HDFS-1323 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node >Reporter: Jay Booth > Attachments: hdfs-1323-20100730.patch, hdfs-1323-trunk.txt > > > Currently, all reads in HDFS require opening and closing the underlying > block/meta filechannels. We could pool these filechannels and save some > system calls and other work. Since HDFS read requests can be satisfied by > positioned reads and transferTos, we can even share these filechannels > between concurrently executing requests. > The attached patch was benchmarked as part of work on HDFS-918 and exhibited > a 10% performance increase for small random reads. > This does not affect client logic and involves minimal change to server > logic. Patch is based on branch 20-append. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (HDFS-1323) Pool/share file channels for HDFS read
[ https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Todd Lipcon updated HDFS-1323: -- Attachment: hdfs-1323-trunk.txt updated Jay's path to trunk. not particularly tested yet > Pool/share file channels for HDFS read > -- > > Key: HDFS-1323 > URL: https://issues.apache.org/jira/browse/HDFS-1323 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node >Reporter: Jay Booth > Attachments: hdfs-1323-20100730.patch, hdfs-1323-trunk.txt > > > Currently, all reads in HDFS require opening and closing the underlying > block/meta filechannels. We could pool these filechannels and save some > system calls and other work. Since HDFS read requests can be satisfied by > positioned reads and transferTos, we can even share these filechannels > between concurrently executing requests. > The attached patch was benchmarked as part of work on HDFS-918 and exhibited > a 10% performance increase for small random reads. > This does not affect client logic and involves minimal change to server > logic. Patch is based on branch 20-append. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] Updated: (HDFS-1323) Pool/share file channels for HDFS read
[ https://issues.apache.org/jira/browse/HDFS-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jay Booth updated HDFS-1323: Attachment: hdfs-1323-20100730.patch > Pool/share file channels for HDFS read > -- > > Key: HDFS-1323 > URL: https://issues.apache.org/jira/browse/HDFS-1323 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node >Reporter: Jay Booth > Fix For: 0.20-append, 0.22.0 > > Attachments: hdfs-1323-20100730.patch > > > Currently, all reads in HDFS require opening and closing the underlying > block/meta filechannels. We could pool these filechannels and save some > system calls and other work. Since HDFS read requests can be satisfied by > positioned reads and transferTos, we can even share these filechannels > between concurrently executing requests. > The attached patch was benchmarked as part of work on HDFS-918 and exhibited > a 10% performance increase for small random reads. > This does not affect client logic and involves minimal change to server > logic. Patch is based on branch 20-append. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
