[ https://issues.apache.org/jira/browse/HDFS-13448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16551333#comment-16551333 ]
genericqa commented on HDFS-13448: ---------------------------------- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 13s{color} | {color:blue} Docker mode activated. {color} | || || || || {color:brown} Prechecks {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 1 new or modified test files. {color} | || || || || {color:brown} trunk Compile Tests {color} || | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m 45s{color} | {color:blue} Maven dependency ordering for branch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 28m 27s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 29m 24s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 24s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m 24s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 15m 20s{color} | {color:green} branch has no errors when building and testing our client artifacts. {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m 24s{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 31s{color} | {color:green} trunk passed {color} | || || || || {color:brown} Patch Compile Tests {color} || | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 18s{color} | {color:blue} Maven dependency ordering for patch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 59s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 29m 49s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} cc {color} | {color:green} 29m 49s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 29m 49s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 23s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m 12s{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} shadedclient {color} | {color:green} 11m 19s{color} | {color:green} patch has no errors when building and testing our client artifacts. {color} | | {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m 51s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m 32s{color} | {color:green} the patch passed {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m 58s{color} | {color:green} hadoop-common in the patch passed. {color} | | {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 44s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} | | {color:red}-1{color} | {color:red} unit {color} | {color:red} 81m 45s{color} | {color:red} hadoop-hdfs in the patch failed. {color} | | {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 50s{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black}235m 50s{color} | {color:black} {color} | \\ \\ || Reason || Tests || | Failed junit tests | hadoop.hdfs.client.impl.TestBlockReaderLocal | \\ \\ || Subsystem || Report/Notes || | Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:ba1ab08 | | JIRA Issue | HDFS-13448 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12931168/HDFS-13448.14.patch | | Optional Tests | asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle cc | | uname | Linux dffc3dcb29f4 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux | | Build tool | maven | | Personality | /testptch/patchprocess/precommit/personality/provided.sh | | git revision | trunk / 8a6bb84 | | maven | version: Apache Maven 3.3.9 | | Default Java | 1.8.0_171 | | findbugs | v3.1.0-RC1 | | unit | https://builds.apache.org/job/PreCommit-HDFS-Build/24627/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt | | Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/24627/testReport/ | | Max. process+thread count | 4094 (vs. ulimit of 10000) | | modules | C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: . | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/24627/console | | Powered by | Apache Yetus 0.8.0-SNAPSHOT http://yetus.apache.org | This message was automatically generated. > HDFS Block Placement - Ignore Locality for First Block Replica > -------------------------------------------------------------- > > Key: HDFS-13448 > URL: https://issues.apache.org/jira/browse/HDFS-13448 > Project: Hadoop HDFS > Issue Type: New Feature > Components: block placement, hdfs-client > Affects Versions: 2.9.0, 3.0.1 > Reporter: BELUGA BEHR > Assignee: BELUGA BEHR > Priority: Minor > Attachments: HDFS-13448.10.patch, HDFS-13448.11.patch, > HDFS-13448.12.patch, HDFS-13448.13.patch, HDFS-13448.14.patch, > HDFS-13448.6.patch, HDFS-13448.7.patch, HDFS-13448.8.patch > > > According to the HDFS Block Place Rules: > {quote} > /** > * The replica placement strategy is that if the writer is on a datanode, > * the 1st replica is placed on the local machine, > * otherwise a random datanode. The 2nd replica is placed on a datanode > * that is on a different rack. The 3rd replica is placed on a datanode > * which is on a different node of the rack as the second replica. > */ > {quote} > However, there is a hint for the hdfs-client that allows the block placement > request to not put a block replica on the local datanode _where 'local' means > the same host as the client is being run on._ > {quote} > /** > * Advise that a block replica NOT be written to the local DataNode where > * 'local' means the same host as the client is being run on. > * > * @see CreateFlag#NO_LOCAL_WRITE > */ > {quote} > I propose that we add a new flag that allows the hdfs-client to request that > the first block replica be placed on a random DataNode in the cluster. The > subsequent block replicas should follow the normal block placement rules. > The issue is that when the {{NO_LOCAL_WRITE}} is enabled, the first block > replica is not placed on the local node, but it is still placed on the local > rack. Where this comes into play is where you have, for example, a flume > agent that is loading data into HDFS. > If the Flume agent is running on a DataNode, then by default, the DataNode > local to the Flume agent will always get the first block replica and this > leads to un-even block placements, with the local node always filling up > faster than any other node in the cluster. > Modifying this example, if the DataNode is removed from the host where the > Flume agent is running, or this {{NO_LOCAL_WRITE}} is enabled by Flume, then > the default block placement policy will still prefer the local rack. This > remedies the situation only so far as now the first block replica will always > be distributed to a DataNode on the local rack. > This new flag would allow a single Flume agent to distribute the blocks > randomly, evenly, over the entire cluster instead of hot-spotting the local > node or the local rack. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org