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Hadoop QA commented on HBASE-9857: ---------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12645671/HBASE-9857-trunk.patch against trunk revision . ATTACHMENT ID: 12645671 {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 26 new or modified tests. {color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings. {color:red}-1 javadoc{color}. The javadoc tool appears to have generated 2 warning messages. {color:red}-1 findbugs{color}. The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings. {color:red}-1 release audit{color}. The applied patch generated 1 release audit warnings (more than the trunk's current 0 warnings). {color:red}-1 lineLengths{color}. The patch introduces the following lines longer than 100: + public HFileReaderV3(final Path path, FixedFileTrailer trailer, final FSDataInputStreamWrapper fsdis, + family.setPrefetchBlocksOnOpen(JBoolean.valueOf(arg.delete(org.apache.hadoop.hbase.HColumnDescriptor::PREFETCH_BLOCKS_ON_OPEN))) if arg.include?(org.apache.hadoop.hbase.HColumnDescriptor::PREFETCH_BLOCKS_ON_OPEN) {color:green}+1 site{color}. The mvn site goal succeeds with this patch. {color:red}-1 core tests{color}. The patch failed these unit tests: org.apache.hadoop.hbase.client.TestHCM Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//testReport/ Release audit warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-thrift.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/9547//console This message is automatically generated. > Blockcache prefetch option > -------------------------- > > Key: HBASE-9857 > URL: https://issues.apache.org/jira/browse/HBASE-9857 > Project: HBase > Issue Type: Improvement > Reporter: Andrew Purtell > Assignee: Andrew Purtell > Priority: Minor > Fix For: 0.99.0, 0.98.3 > > Attachments: 9857.patch, 9857.patch, HBASE-9857-0.98.patch, > HBASE-9857-trunk.patch > > > Attached patch implements a prefetching function for HFile (v3) blocks, if > indicated by a column family or regionserver property. The purpose of this > change is to as rapidly after region open as reasonable warm the blockcache > with all the data and index blocks of (presumably also in-memory) table data, > without counting those block loads as cache misses. Great for fast reads and > keeping the cache hit ratio high. Can tune the IO impact versus time until > all data blocks are in cache. Works a bit like CompactSplitThread. Makes some > effort not to stampede. > I have been using this for setting up various experiments and thought I'd > polish it up a bit and throw it out there. If the data to be preloaded will > not fit in blockcache, or if as a percentage of blockcache it is large, this > is not a good idea, will just blow out the cache and trigger a lot of useless > GC activity. Might be useful as an expert tuning option though. Or not. -- This message was sent by Atlassian JIRA (v6.2#6252)