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Posted to common-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2017/09/03 10:17:00 UTC
[jira] [Commented] (HADOOP-12077) Provide a multi-URI replication
Inode for ViewFs
[ https://issues.apache.org/jira/browse/HADOOP-12077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16151770#comment-16151770 ]
Hadoop QA commented on HADOOP-12077:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 17s{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 3 new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 45s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 13m 41s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 14m 31s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m 0s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m 1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m 15s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 42s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 16s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 34s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 10m 57s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 10m 57s{color} | {color:red} root generated 1 new + 1285 unchanged - 0 fixed = 1286 total (was 1285) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange} 2m 5s{color} | {color:orange} root: The patch generated 2 new + 152 unchanged - 11 fixed = 154 total (was 163) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m 5s{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} findbugs {color} | {color:green} 3m 37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 51s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 8m 8s{color} | {color:red} hadoop-common in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 94m 4s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 39s{color} | {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}185m 40s{color} | {color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.security.TestRaceWhenRelogin |
| | hadoop.security.TestKDiag |
| | hadoop.hdfs.TestBlockStoragePolicy |
| | hadoop.hdfs.TestClientProtocolForPipelineRecovery |
| | hadoop.hdfs.TestLeaseRecoveryStriped |
| | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure200 |
| | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure110 |
| | hadoop.hdfs.TestReplaceDatanodeOnFailure |
| | hadoop.hdfs.TestReadStripedFileWithDecoding |
| | hadoop.hdfs.TestEncryptionZonesWithHA |
| | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure140 |
| | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureReporting |
| | hadoop.hdfs.TestFileAppendRestart |
| Timed out junit tests | org.apache.hadoop.hdfs.TestWriteReadStripedFile |
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:71bbb86 |
| JIRA Issue | HADOOP-12077 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12885126/HADOOP-12077.010.patch |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite unit findbugs checkstyle |
| uname | Linux 248e8a593816 3.13.0-117-generic #164-Ubuntu SMP Fri Apr 7 11:05:26 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 275980b |
| Default Java | 1.8.0_144 |
| findbugs | v3.1.0-RC1 |
| javac | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/artifact/patchprocess/diff-compile-javac-root.txt |
| checkstyle | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/artifact/patchprocess/diff-checkstyle-root.txt |
| unit | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common.txt |
| unit | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt |
| Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/testReport/ |
| modules | C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/13158/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Provide a multi-URI replication Inode for ViewFs
> ------------------------------------------------
>
> Key: HADOOP-12077
> URL: https://issues.apache.org/jira/browse/HADOOP-12077
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: Gera Shegalov
> Assignee: Gera Shegalov
> Attachments: HADOOP-12077.001.patch, HADOOP-12077.002.patch, HADOOP-12077.003.patch, HADOOP-12077.004.patch, HADOOP-12077.005.patch, HADOOP-12077.006.patch, HADOOP-12077.007.patch, HADOOP-12077.008.patch, HADOOP-12077.009.patch, HADOOP-12077.010.patch
>
>
> This JIRA is to provide simple "replication" capabilities for applications that maintain logically equivalent paths in multiple locations for caching or failover (e.g., S3 and HDFS). We noticed a simple common HDFS usage pattern in our applications. They host their data on some logical cluster C. There are corresponding HDFS clusters in multiple datacenters. When the application runs in DC1, it prefers to read from C in DC1, and the applications prefers to failover to C in DC2 if the application is migrated to DC2 or when C in DC1 is unavailable. New application data versions are created periodically/relatively infrequently.
> In order to address many common scenarios in a general fashion, and to avoid unnecessary code duplication, we implement this functionality in ViewFs (our default FileSystem spanning all clusters in all datacenters) in a project code-named Nfly (N as in N datacenters). Currently each ViewFs Inode points to a single URI via ChRootedFileSystem. Consequently, we introduce a new type of links that points to a list of URIs that are each going to be wrapped in ChRootedFileSystem. A typical usage: /nfly/C/user->/DC1/C/user,/DC2/C/user,... This collection of ChRootedFileSystem instances is fronted by the Nfly filesystem object that is actually used for the mount point/Inode. Nfly filesystems backs a single logical path /nfly/C/user/<user>/path by multiple physical paths.
> Nfly filesystem supports setting minReplication. As long as the number of URIs on which an update has succeeded is greater than or equal to minReplication exceptions are only logged but not thrown. Each update operation is currently executed serially (client-bandwidth driven parallelism will be added later).
> A file create/write:
> # Creates a temporary invisible _nfly_tmp_file in the intended chrooted filesystem.
> # Returns a FSDataOutputStream that wraps output streams returned by 1
> # All writes are forwarded to each output stream.
> # On close of stream created by 2, all n streams are closed, and the files are renamed from _nfly_tmp_file to file. All files receive the same mtime corresponding to the client system time as of beginning of this step.
> # If at least minReplication destinations has gone through steps 1-4 without failures the transaction is considered logically committed, otherwise a best-effort attempt of cleaning up the temporary files is attempted.
> As for reads, we support a notion of locality similar to HDFS /DC/rack/node. We sort Inode URIs using NetworkTopology by their authorities. These are typically host names in simple HDFS URIs. If the authority is missing as is the case with the local file:/// the local host name is assumed InetAddress.getLocalHost(). This makes sure that the local file system is always the closest one to the reader in this approach. For our Hadoop 2 hdfs URIs that are based on nameservice ids instead of hostnames it is very easy to adjust the topology script since our nameservice ids already contain the datacenter. As for rack and node we can simply output any string such as /DC/rack-nsid/node-nsid, since we only care about datacenter-locality for such filesystem clients.
> There are 2 policies/additions to the read call path that makes it more expensive, but improve user experience:
> - readMostRecent - when this policy is enabled, Nfly first checks mtime for the path under all URIs, sorts them from most recent to least recent. Nfly then sorts the set of most recent URIs topologically in the same manner as described above.
> - repairOnRead - when readMostRecent is enabled Nfly already has to RPC all underlying destinations. With repairOnRead, Nfly filesystem would additionally attempt to refresh destinations with the path missing or a stale version of the path using the nearest available most recent destination.
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