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Posted to common-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2018/10/16 21:47:00 UTC
[jira] [Commented] (HADOOP-15859) ZStandardDecompressor.c mistakes
a class for an instance
[ https://issues.apache.org/jira/browse/HADOOP-15859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16652495#comment-16652495 ]
Hadoop QA commented on HADOOP-15859:
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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 19s{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:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m 0s{color} | {color:red} The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 19m 55s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 16m 8s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 52s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 13m 47s{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} 1m 39s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 2s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m 22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 15m 22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 15m 22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 11s{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 12s{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} 1m 45s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 59s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 8m 44s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 41s{color} | {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 96m 16s{color} | {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:4b8c2b1 |
| JIRA Issue | HADOOP-15859 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12944206/HADOOP-15859.001.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle cc |
| uname | Linux c39192ea1aa1 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 / d59ca43 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/15381/testReport/ |
| Max. process+thread count | 1362 (vs. ulimit of 10000) |
| modules | C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/15381/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> ZStandardDecompressor.c mistakes a class for an instance
> --------------------------------------------------------
>
> Key: HADOOP-15859
> URL: https://issues.apache.org/jira/browse/HADOOP-15859
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.9.0, 3.0.0-alpha2
> Reporter: Ben Lau
> Assignee: Jason Lowe
> Priority: Blocker
> Attachments: HADOOP-15859.001.patch
>
>
> As a follow up to HADOOP-15820, I was doing more testing on ZSTD compression and still encountered segfaults in the JVM in HBase after that fix.
> I took a deeper look and realized there is still another bug, which looks like it's that we are actually [calling setInt()|https://github.com/apache/hadoop/blob/f13e231025333ebf80b30bbdce1296cef554943b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/zstd/ZStandardDecompressor.c#L148] on the "remaining" variable on the ZStandardDecompressor class itself (instead of an instance of that class) because the Java stub for the native C init() function [is marked static|https://github.com/apache/hadoop/blob/a0a276162147e843a5a4e028abdca5b66f5118da/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardDecompressor.java#L253], leading to memory corruption and a crash during GC later.
> Initially I thought we would fix this by changing the Java init() method to be non-static, but it looks like the "remaining" setInt() call is actually unnecessary anyway, because in ZStandardDecompressor.java's reset() we [set "remaining" to 0 right after calling the JNI init() call|https://github.com/apache/hadoop/blob/a0a276162147e843a5a4e028abdca5b66f5118da/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardDecompressor.java#L216]. So ZStandardDecompressor.java init() doesn't have to be changed to an instance method, we can leave it as static, but remove the JNI init() call's "remaining" setInt() call altogether.
> Furthermore we should probably clean up the class/instance distinction in the C file because that's what led to this confusion. There are some other methods where the distinction is incorrect or ambiguous, we should fix them to prevent this from happening again.
> I talked to [~jlowe] who further pointed out the ZStandardCompressor also has similar problems and needs to be fixed too.
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