[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17194699#comment-17194699
]
Hadoop QA commented on HADOOP-16083:
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[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16915907#comment-16915907
]
Hadoop QA commented on HADOOP-16083:
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| {color:black}{color} | {color:black} {color} | {color:black} 77m 37s{color} |
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\\
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|| Reason || Tests ||
| Failed junit tests | hadoop.tools.mapred.TestCopyMapper |
| | hadoop.tools.mapred.TestCopyMapperCompositeCrc |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Client=19.03.1 Server=19.03.1 Image:yetus/hadoop:bdbca0e53b4 |
| JIRA Issue | HADOOP-16083 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12956683/HADOOP-16083.001.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle |
| uname | Linux 216e7d011666 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 23e532d |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| findbugs | v3.1.0-RC1 |
| unit |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16504/artifact/out/patch-unit-hadoop-tools_hadoop-distcp.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16504/testReport/ |
| Max. process+thread count | 423 (vs. ulimit of 5500) |
| modules | C: hadoop-tools/hadoop-distcp U:
[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16915817#comment-16915817
]
Zhankun Tang commented on HADOOP-16083:
---
Bulk update: Preparing for 3.1.3 release. moved all 3.1.3 non-blocker issues to
3.1.4, please move back if it is a blocker for you.
> DistCp shouldn't always overwrite the target file when checksums match
> --
>
> Key: HADOOP-16083
> URL: https://issues.apache.org/jira/browse/HADOOP-16083
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
>Affects Versions: 3.2.0, 3.1.1, 3.3.0
>Reporter: Siyao Meng
>Assignee: Siyao Meng
>Priority: Major
> Attachments: HADOOP-16083.001.patch
>
>
> {code:java|title=CopyMapper#setup}
> ...
> try {
> overWrite = overWrite ||
> targetFS.getFileStatus(targetFinalPath).isFile();
> } catch (FileNotFoundException ignored) {
> }
> ...
> {code}
> The above code overrides config key "overWrite" to "true" when the target
> path is a file. Therefore, unnecessary transfer happens when the source and
> target file have the same checksums.
> My suggestion is: remove the code above. If the user insists to overwrite,
> just add -overwrite in the options:
> {code:bash|title=DistCp command with -overwrite option}
> hadoop distcp -overwrite hdfs://localhost:64464/source/5/6.txt
> hdfs://localhost:64464/target/5/6.txt
> {code}
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[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16761161#comment-16761161
]
Steve Loughran commented on HADOOP-16083:
-
I understand. It's the special case of single file copy. It's probably not
surfaced that much because either (a) it doesn't get used much or (b) its been
for small files and nobody noticed. And yes, looks like a bug to me.
I think for the single file copy we just need to make sure that
in a filesystem with checksums, the copy doesn't take place if the checksums
match
and it does still take place if the checksums don't match, or if -skipCrcCheck
is set
> DistCp shouldn't always overwrite the target file when checksums match
> --
>
> Key: HADOOP-16083
> URL: https://issues.apache.org/jira/browse/HADOOP-16083
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
>Affects Versions: 3.2.0, 3.1.1, 3.3.0
>Reporter: Siyao Meng
>Assignee: Siyao Meng
>Priority: Major
> Attachments: HADOOP-16083.001.patch
>
>
> {code:java|title=CopyMapper#setup}
> ...
> try {
> overWrite = overWrite ||
> targetFS.getFileStatus(targetFinalPath).isFile();
> } catch (FileNotFoundException ignored) {
> }
> ...
> {code}
> The above code overrides config key "overWrite" to "true" when the target
> path is a file. Therefore, unnecessary transfer happens when the source and
> target file have the same checksums.
> My suggestion is: remove the code above. If the user insists to overwrite,
> just add -overwrite in the options:
> {code:bash|title=DistCp command with -overwrite option}
> hadoop distcp -overwrite hdfs://localhost:64464/source/5/6.txt
> hdfs://localhost:64464/target/5/6.txt
> {code}
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[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16755424#comment-16755424
]
Siyao Meng commented on HADOOP-16083:
-
[~ste...@apache.org] Thanks for the comment.
The case involved here is *single file* copy with CRC check enabled. If the
target path is a directory, *for HDFS* it will skip files that has the same
checksum. For example, the command below will always copy and overwrite the
file at the target.
{code:bash|title=Target path is a file}
$ hadoop distcp -update hdfs:///src/2.txt hdfs:///dst/2.txt
...
Bytes Copied=6
Bytes Expected=6
Files Copied=1
{code}
But this command wouldn't skip the copy is the target file exists and is the
same, note the target path is a directory now instead of a file.
{code:bash|title=Target path is a directory}
$ hadoop distcp -update hdfs:///src/2.txt hdfs:///dst/
...
Bytes Skipped=6
Files Skipped=1
{code}
I'm aware that the change might lead to subtle failures of other applications.
For HDFS, so far I figured the only thing that changed with the patch would be
the modification time of the file on target FS. This is tested in
TestCopyMapper#testSingleFileCopy() and
TestCopyMapperCompositeCrc#testSingleFileCopy(). Both test case failures would
be addressed in rev 002.
I agree that if the target FS 1. doesn't support checksum; or 2. disabled
checksum; or 3. doesn't support timestamp modification (touch), the file should
always be copied.
What new tests should be added in AbstractContractDistCpTest?
> DistCp shouldn't always overwrite the target file when checksums match
> --
>
> Key: HADOOP-16083
> URL: https://issues.apache.org/jira/browse/HADOOP-16083
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
>Affects Versions: 3.2.0, 3.1.1, 3.3.0
>Reporter: Siyao Meng
>Assignee: Siyao Meng
>Priority: Major
> Attachments: HADOOP-16083.001.patch
>
>
> {code:java|title=CopyMapper#setup}
> ...
> try {
> overWrite = overWrite ||
> targetFS.getFileStatus(targetFinalPath).isFile();
> } catch (FileNotFoundException ignored) {
> }
> ...
> {code}
> The above code overrides config key "overWrite" to "true" when the target
> path is a file. Therefore, unnecessary transfer happens when the source and
> target file have the same checksums.
> My suggestion is: remove the code above. If the user insists to overwrite,
> just add -overwrite in the options:
> {code:bash|title=DistCp command with -overwrite option}
> hadoop distcp -overwrite hdfs://localhost:64464/source/5/6.txt
> hdfs://localhost:64464/target/5/6.txt
> {code}
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[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16754962#comment-16754962
]
Steve Loughran commented on HADOOP-16083:
-
So what you are saying is if CRC checking is enabled, (i.e. you dont do an
update with -skipCrcCheck), it overwrites all files?
Because with the CRC check disabled, I thought it was simpler than that
* files where lengths are different: update
* files where source is missing delete (if some other option is enabled)
* files where source length == dest.length then skip overwrite
Now, if the dest is a filesystem without checksums, the update downgrades to
assuming you'd requested crc were skipped (this has caused problems with adding
CRC checks to S3a (HADOOP-13232): all existing workflows and tests broke.
Which is why we have to be very careful about any changes here. All workflows,
including those invoked internally by Hive, called from OOzie, etc work, with
sources and destinations other than just HDFS -> HDFS.
h3. If I explicitly copy a file from HDFS to S3a, even without -skipCRCCheck, I
expect the file to be copied. As happens today.
# you'll have to talk to people who use distcp here. At the very least, this
must only happen when source and dest are using checksums and the checksums are
equal.
# The new tests will need to go into AbstractContractDistCpTest
> DistCp shouldn't always overwrite the target file when checksums match
> --
>
> Key: HADOOP-16083
> URL: https://issues.apache.org/jira/browse/HADOOP-16083
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
>Affects Versions: 3.2.0, 3.1.1, 3.3.0
>Reporter: Siyao Meng
>Assignee: Siyao Meng
>Priority: Major
> Attachments: HADOOP-16083.001.patch
>
>
> {code:java|title=CopyMapper#setup}
> ...
> try {
> overWrite = overWrite ||
> targetFS.getFileStatus(targetFinalPath).isFile();
> } catch (FileNotFoundException ignored) {
> }
> ...
> {code}
> The above code overrides config key "overWrite" to "true" when the target
> path is a file. Therefore, unnecessary transfer happens when the source and
> target file have the same checksums.
> My suggestion is: remove the code above. If the user insists to overwrite,
> just add -overwrite in the options:
> {code:bash|title=DistCp command with -overwrite option}
> hadoop distcp -overwrite hdfs://localhost:64464/source/5/6.txt
> hdfs://localhost:64464/target/5/6.txt
> {code}
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[jira] [Commented] (HADOOP-16083) DistCp shouldn't always overwrite the target file when checksums match
[
https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16754881#comment-16754881
]
Hadoop QA commented on HADOOP-16083:
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0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
13m 36s{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} 0m
41s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
17s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 12m 47s{color}
| {color:red} hadoop-distcp in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
24s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 66m 38s{color} |
{color:black} {color} |
\\
\\
|| Reason || Tests ||
| Failed junit tests | hadoop.tools.mapred.TestCopyMapper |
| | hadoop.tools.mapred.TestCopyMapperCompositeCrc |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:8f97d6f |
| JIRA Issue | HADOOP-16083 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12956683/HADOOP-16083.001.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle |
| uname | Linux 9f23c8242fb5 4.4.0-138-generic #164~14.04.1-Ubuntu SMP Fri Oct
5 08:56:16 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 5d578d0 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_191 |
| findbugs | v3.1.0-RC1 |
| unit |
https://builds.apache.org/job/PreCommit-HADOOP-Build/15861/artifact/out/patch-unit-hadoop-tools_hadoop-distcp.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/15861/testReport/ |
| Max. process+thread count | 340 (vs. ulimit of 1) |
| modules | C: hadoop-tools/hadoop-distcp U:
