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Hadoop QA commented on HBASE-5074: ---------------------------------- -1 overall. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12516798/D1521.11.patch against trunk revision . +1 @author. The patch does not contain any @author tags. +1 tests included. The patch appears to include 55 new or modified tests. -1 javadoc. The javadoc tool appears to have generated -125 warning messages. +1 javac. The applied patch does not increase the total number of javac compiler warnings. -1 findbugs. The patch appears to introduce 159 new Findbugs (version 1.3.9) warnings. +1 release audit. The applied patch does not increase the total number of release audit warnings. -1 core tests. The patch failed these unit tests: org.apache.hadoop.hbase.io.hfile.TestFixedFileTrailer org.apache.hadoop.hbase.mapreduce.TestHFileOutputFormat org.apache.hadoop.hbase.mapred.TestTableMapReduce org.apache.hadoop.hbase.mapreduce.TestImportTsv Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/1079//testReport/ Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/1079//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1079//console This message is automatically generated. > support checksums in HBase block cache > -------------------------------------- > > Key: HBASE-5074 > URL: https://issues.apache.org/jira/browse/HBASE-5074 > Project: HBase > Issue Type: Improvement > Components: regionserver > Reporter: dhruba borthakur > Assignee: dhruba borthakur > Attachments: D1521.1.patch, D1521.1.patch, D1521.10.patch, > D1521.10.patch, D1521.10.patch, D1521.10.patch, D1521.10.patch, > D1521.11.patch, D1521.11.patch, D1521.2.patch, D1521.2.patch, D1521.3.patch, > D1521.3.patch, D1521.4.patch, D1521.4.patch, D1521.5.patch, D1521.5.patch, > D1521.6.patch, D1521.6.patch, D1521.7.patch, D1521.7.patch, D1521.8.patch, > D1521.8.patch, D1521.9.patch, D1521.9.patch > > > The current implementation of HDFS stores the data in one block file and the > metadata(checksum) in another block file. This means that every read into the > HBase block cache actually consumes two disk iops, one to the datafile and > one to the checksum file. This is a major problem for scaling HBase, because > HBase is usually bottlenecked on the number of random disk iops that the > storage-hardware offers. -- 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