[ https://issues.apache.org/jira/browse/HBASE-15871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15451543#comment-15451543 ]
Hadoop QA commented on HBASE-15871: ----------------------------------- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 17s {color} | {color:blue} Docker mode activated. {color} | | {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s {color} | {color:green} The patch does not contain any @author tags. {color} | | {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 0s {color} | {color:green} The patch appears to include 5 new or modified test files. {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 4s {color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 31s {color} | {color:green} master passed with JDK v1.8.0_101 {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 35s {color} | {color:green} master passed with JDK v1.7.0_111 {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 49s {color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 17s {color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 55s {color} | {color:green} master passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 25s {color} | {color:green} master passed with JDK v1.8.0_101 {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 34s {color} | {color:green} master passed with JDK v1.7.0_111 {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 46s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 31s {color} | {color:green} the patch passed with JDK v1.8.0_101 {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 31s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 35s {color} | {color:green} the patch passed with JDK v1.7.0_111 {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 35s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 49s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 17s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color} | {color:green} The patch has no whitespace issues. {color} | | {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 27m 31s {color} | {color:green} Patch does not cause any errors with Hadoop 2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} | | {color:green}+1{color} | {color:green} hbaseprotoc {color} | {color:green} 0m 15s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 11s {color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 27s {color} | {color:green} the patch passed with JDK v1.8.0_101 {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 33s {color} | {color:green} the patch passed with JDK v1.7.0_111 {color} | | {color:red}-1{color} | {color:red} unit {color} | {color:red} 104m 33s {color} | {color:red} hbase-server in the patch failed. {color} | | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 22s {color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 147m 53s {color} | {color:black} {color} | \\ \\ || Reason || Tests || | Timed out junit tests | org.apache.hadoop.hbase.master.TestAssignmentManagerMetrics | \\ \\ || Subsystem || Report/Notes || | Docker | Client=1.11.2 Server=1.11.2 Image:yetus/hbase:date2016-08-31 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12826327/HBASE-15871_3.patch | | JIRA Issue | HBASE-15871 | | Optional Tests | asflicense javac javadoc unit findbugs hadoopcheck hbaseanti checkstyle compile | | uname | Linux 11c09142414b 3.13.0-92-generic #139-Ubuntu SMP Tue Jun 28 20:42:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux | | Build tool | maven | | Personality | /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh | | git revision | master / 647a65c | | Default Java | 1.7.0_111 | | Multi-JDK versions | /usr/lib/jvm/java-8-oracle:1.8.0_101 /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_111 | | findbugs | v3.0.0 | | unit | https://builds.apache.org/job/PreCommit-HBASE-Build/3352/artifact/patchprocess/patch-unit-hbase-server.txt | | unit test logs | https://builds.apache.org/job/PreCommit-HBASE-Build/3352/artifact/patchprocess/patch-unit-hbase-server.txt | | Test Results | https://builds.apache.org/job/PreCommit-HBASE-Build/3352/testReport/ | | modules | C: hbase-server U: hbase-server | | Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/3352/console | | Powered by | Apache Yetus 0.3.0 http://yetus.apache.org | This message was automatically generated. > Memstore flush doesn't finish because of backwardseek() in memstore scanner. > ---------------------------------------------------------------------------- > > Key: HBASE-15871 > URL: https://issues.apache.org/jira/browse/HBASE-15871 > Project: HBase > Issue Type: Bug > Components: Scanners > Affects Versions: 1.1.2 > Reporter: Jeongdae Kim > Assignee: ramkrishna.s.vasudevan > Fix For: 2.0.0, 1.4.0 > > Attachments: HBASE-15871-branch-1.patch, > HBASE-15871.branch-1.1.001.patch, HBASE-15871.branch-1.1.002.patch, > HBASE-15871.branch-1.1.003.patch, HBASE-15871.patch, HBASE-15871_1.patch, > HBASE-15871_1.patch, HBASE-15871_2.patch, HBASE-15871_3.patch, > memstore_backwardSeek().PNG > > > Sometimes in our production hbase cluster, it takes a long time to finish > memstore flush.( for about more than 30 minutes) > the reason is that a memstore flusher thread calls > StoreScanner.updateReaders(), waits for acquiring a lock that store scanner > holds in StoreScanner.next() and backwardseek() in memstore scanner runs for > a long time. > I think that this condition could occur in reverse scan by the following > process. > 1) create a reversed store scanner by requesting a reverse scan. > 2) flush a memstore in the same HStore. > 3) puts a lot of cells in memstore and memstore is almost full. > 4) call the reverse scanner.next() and re-create all scanners in this store > because all scanners was already closed by 2)'s flush() and backwardseek() > with store's lastTop for all new scanners. > 5) in this status, memstore is almost full by 2) and all cells in memstore > have sequenceID greater than this scanner's readPoint because of 2)'s > flush(). this condition causes searching all cells in memstore, and > seekToPreviousRow() repeatly seach cells that are already searched if a row > has one column. (described this in more detail in a attached file.) > 6) flush a memstore again in the same HStore, and wait until 4-5) process > finished, to update store files in the same HStore after flusing. > I searched HBase jira. and found a similar issue. (HBASE-14497) but, > HBASE-14497's fix can't solve this issue because that fix just changed > recursive call to loop.(and already applied to our HBase version) -- This message was sent by Atlassian JIRA (v6.3.4#6332)