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https://issues.apache.org/jira/browse/HADOOP-13403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398117#comment-15398117
]
Hadoop QA commented on HADOOP-13403:
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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
14s{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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m
33s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
17s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
13s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m
19s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
13s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m
25s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
13s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
14s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
0m 11s{color} | {color:orange} hadoop-tools/hadoop-azure: The patch generated
39 new + 43 unchanged - 1 fixed = 82 total (was 44) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
9s{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 55 line(s) that end in whitespace. Use
git apply --whitespace=fix <<patch_file>>. Refer
https://git-scm.com/docs/git-apply {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m
2s{color} | {color:red} The patch 4 line(s) with tabs. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 0m
39s{color} | {color:red} hadoop-tools/hadoop-azure generated 4 new + 0
unchanged - 0 fixed = 4 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
11s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m
31s{color} | {color:green} hadoop-azure in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
16s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 13m 27s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-tools/hadoop-azure |
| | Redundant nullcheck of ioThreadPool, which is known to be non-null in
org.apache.hadoop.fs.azure.NativeAzureFileSystem.executeParallel(NativeAzureFileSystem$AzureFileSystemOperation,
String, FileMetadata[], String, int, Configuration, String,
NativeAzureFileSystem$AzureFileSystemThreadOperation) Redundant null check at
NativeAzureFileSystem.java:is known to be non-null in
org.apache.hadoop.fs.azure.NativeAzureFileSystem.executeParallel(NativeAzureFileSystem$AzureFileSystemOperation,
String, FileMetadata[], String, int, Configuration, String,
NativeAzureFileSystem$AzureFileSystemThreadOperation) Redundant null check at
NativeAzureFileSystem.java:[line 910] |
| | Should
org.apache.hadoop.fs.azure.NativeAzureFileSystem$AzureFileSystemThreadFactory
be a _static_ inner class? At NativeAzureFileSystem.java:inner class? At
NativeAzureFileSystem.java:[lines 717-737] |
| | new
org.apache.hadoop.fs.azure.NativeAzureFileSystem$AzureFileSystemThreadRunnable(NativeAzureFileSystem,
NativeAzureFileSystem$AzureFileSystemOperation, String, FileMetadata[],
NativeAzureFileSystem$AzureFileSystemThreadOperation) may expose internal
representation by storing an externally mutable object into
NativeAzureFileSystem$AzureFileSystemThreadRunnable.files At
NativeAzureFileSystem.java:NativeAzureFileSystem$AzureFileSystemThreadOperation)
may expose internal representation by storing an externally mutable object
into NativeAzureFileSystem$AzureFileSystemThreadRunnable.files At
NativeAzureFileSystem.java:[line 796] |
| | Should
org.apache.hadoop.fs.azure.NativeAzureFileSystem$AzureFileSystemThreadRunnable
be a _static_ inner class? At NativeAzureFileSystem.java:inner class? At
NativeAzureFileSystem.java:[lines 766-841] |
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12820673/HADOOP-13403-002.patch
|
| JIRA Issue | HADOOP-13403 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle |
| uname | Linux 52faf7262ecd 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 / 26de4f0 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/artifact/patchprocess/diff-checkstyle-hadoop-tools_hadoop-azure.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/artifact/patchprocess/whitespace-eol.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/artifact/patchprocess/whitespace-tabs.txt
|
| findbugs |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/artifact/patchprocess/new-findbugs-hadoop-tools_hadoop-azure.html
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/testReport/ |
| modules | C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/10108/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> AzureNativeFileSystem rename/delete performance improvements
> ------------------------------------------------------------
>
> Key: HADOOP-13403
> URL: https://issues.apache.org/jira/browse/HADOOP-13403
> Project: Hadoop Common
> Issue Type: Bug
> Components: azure
> Affects Versions: 2.7.2
> Reporter: Subramanyam Pattipaka
> Fix For: 2.9.0
>
> Attachments: HADOOP-13403-001.patch, HADOOP-13403-002.patch
>
>
> WASB Performance Improvements
> Problem
> -----------
> Azure Native File system operations like rename/delete which has large number
> of directories and/or files in the source directory are experiencing
> performance issues. Here are possible reasons
> a) We first list all files under source directory hierarchically. This is
> a serial operation.
> b) After collecting the entire list of files under a folder, we delete or
> rename files one by one serially.
> c) There is no logging information available for these costly operations
> even in DEBUG mode leading to difficulty in understanding wasb performance
> issues.
> Proposal
> -------------
> Step 1: Rename and delete operations will generate a list all files under the
> source folder. We need to use azure flat listing option to get list with
> single request to azure store. We have introduced config
> fs.azure.flatlist.enable to enable this option. The default value is 'false'
> which means flat listing is disabled.
> Step 2: Create thread pool and threads dynamically based on user
> configuration. These thread pools will be deleted after operation is over.
> We are introducing introducing two new configs
> a) fs.azure.rename.threads : Config to set number of rename
> threads. Default value is 0 which means no threading.
> b) fs.azure.delete.threads: Config to set number of delete
> threads. Default value is 0 which means no threading.
> We have provided debug log information on number of threads not used
> for the operation which can be useful .
> Failure Scenarios:
> If we fail to create thread pool due to ANY reason (for example trying
> create with thread count with large value such as 1000000), we fall back to
> serialization operation.
> Step 3: Bob operations can be done in parallel using multiple threads
> executing following snippet
> while ((currentIndex = fileIndex.getAndIncrement()) < files.length) {
> FileMetadata file = files[currentIndex];
> Rename/delete(file);
> }
> The above strategy depends on the fact that all files are stored in a
> final array and each thread has to determine synchronized next index to do
> the job. The advantage of this strategy is that even if user configures large
> number of unusable threads, we always ensure that work doesn’t get serialized
> due to lagging threads.
> We are logging following information which can be useful for tuning
> number of threads
> a) Number of unusable threads
> b) Time taken by each thread
> c) Number of files processed by each thread
> d) Total time taken for the operation
> Failure Scenarios:
> Failure to queue a thread execute request shouldn’t be an issue if we
> can ensure at least one thread has completed execution successfully. If we
> couldn't schedule one thread then we should take serialization path.
> Exceptions raised while executing threads are still considered regular
> exceptions and returned to client as operation failed. Exceptions raised
> while stopping threads and deleting thread pool shouldn't can be ignored if
> operation all files are done with out any issue.
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