[ https://issues.apache.org/jira/browse/HDFS-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490287#comment-15490287 ]
Hadoop QA commented on HDFS-9668: --------------------------------- | (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 2 new or modified test files. {color} | | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m 22s{color} | {color:blue} Maven dependency ordering for branch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 13s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 7m 27s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m 35s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 55s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 26s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 1s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 52s{color} | {color:green} trunk passed {color} | | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 15s{color} | {color:blue} Maven dependency ordering for patch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 35s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 7m 31s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 7m 31s{color} | {color:green} the patch passed {color} | | {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange} 1m 30s{color} | {color:orange} root: The patch generated 65 new + 183 unchanged - 12 fixed = 248 total (was 195) {color} | | {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m 16s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 28s{color} | {color:green} the patch passed {color} | | {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s{color} | {color:red} The patch has 2 line(s) that end in whitespace. Use git apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 4m 12s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 47s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m 44s{color} | {color:green} hadoop-common in the patch passed. {color} | | {color:red}-1{color} | {color:red} unit {color} | {color:red} 81m 21s{color} | {color:red} hadoop-hdfs in the patch failed. {color} | | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 25s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black}137m 12s{color} | {color:black} {color} | \\ \\ || Reason || Tests || | Failed junit tests | hadoop.hdfs.TestPersistBlocks | | | hadoop.hdfs.server.namenode.TestReconstructStripedBlocks | \\ \\ || Subsystem || Report/Notes || | Docker | Image:yetus/hadoop:9560f25 | | JIRA Issue | HDFS-9668 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12828426/HDFS-9668-8.patch | | Optional Tests | asflicense compile javac javadoc mvninstall mvnsite unit findbugs checkstyle | | uname | Linux ce5ec0ac3a46 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux | | Build tool | maven | | Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh | | git revision | trunk / ea0c2b8 | | Default Java | 1.8.0_101 | | findbugs | v3.0.0 | | checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/16739/artifact/patchprocess/diff-checkstyle-root.txt | | whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/16739/artifact/patchprocess/whitespace-eol.txt | | unit | https://builds.apache.org/job/PreCommit-HDFS-Build/16739/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt | | Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/16739/testReport/ | | modules | C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs U: . | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/16739/console | | Powered by | Apache Yetus 0.4.0-SNAPSHOT http://yetus.apache.org | This message was automatically generated. > Optimize the locking in FsDatasetImpl > ------------------------------------- > > Key: HDFS-9668 > URL: https://issues.apache.org/jira/browse/HDFS-9668 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Reporter: Jingcheng Du > Assignee: Jingcheng Du > Attachments: HDFS-9668-1.patch, HDFS-9668-2.patch, HDFS-9668-3.patch, > HDFS-9668-4.patch, HDFS-9668-5.patch, HDFS-9668-6.patch, HDFS-9668-7.patch, > HDFS-9668-8.patch, execution_time.png > > > During the HBase test on a tiered storage of HDFS (WAL is stored in > SSD/RAMDISK, and all other files are stored in HDD), we observe many > long-time BLOCKED threads on FsDatasetImpl in DataNode. The following is part > of the jstack result: > {noformat} > "DataXceiver for client DFSClient_NONMAPREDUCE_-1626037897_1 at > /192.168.50.16:48521 [Receiving block > BP-1042877462-192.168.50.13-1446173170517:blk_1073779272_40852]" - Thread > t@93336 > java.lang.Thread.State: BLOCKED > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:1111) > - waiting to lock <18324c9> (a > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl) owned by > "DataXceiver for client DFSClient_NONMAPREDUCE_-1626037897_1 at > /192.168.50.16:48520 [Receiving block > BP-1042877462-192.168.50.13-1446173170517:blk_1073779271_40851]" t@93335 > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:113) > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:183) > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:615) > at > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137) > at > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74) > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:235) > at java.lang.Thread.run(Thread.java:745) > Locked ownable synchronizers: > - None > > "DataXceiver for client DFSClient_NONMAPREDUCE_-1626037897_1 at > /192.168.50.16:48520 [Receiving block > BP-1042877462-192.168.50.13-1446173170517:blk_1073779271_40851]" - Thread > t@93335 > java.lang.Thread.State: RUNNABLE > at java.io.UnixFileSystem.createFileExclusively(Native Method) > at java.io.File.createNewFile(File.java:1012) > at > org.apache.hadoop.hdfs.server.datanode.DatanodeUtil.createTmpFile(DatanodeUtil.java:66) > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice.createRbwFile(BlockPoolSlice.java:271) > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.createRbwFile(FsVolumeImpl.java:286) > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:1140) > - locked <18324c9> (a > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl) > at > org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:113) > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:183) > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:615) > at > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137) > at > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74) > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:235) > at java.lang.Thread.run(Thread.java:745) > Locked ownable synchronizers: > - None > {noformat} > We measured the execution of some operations in FsDatasetImpl during the > test. Here following is the result. > !execution_time.png! > The operations of finalizeBlock, addBlock and createRbw on HDD in a heavy > load take a really long time. > It means one slow operation of finalizeBlock, addBlock and createRbw in a > slow storage can block all the other same operations in the same DataNode, > especially in HBase when many wal/flusher/compactor are configured. > We need a finer grained lock mechanism in a new FsDatasetImpl implementation > and users can choose the implementation by configuring > "dfs.datanode.fsdataset.factory" in DataNode. > We can implement the lock by either storage level or block-level. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org