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Posted to notifications@asterixdb.apache.org by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org> on 2018/08/09 06:12:41 UTC
Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Murtadha Hubail has uploaded a new change for review.
https://asterix-gerrit.ics.uci.edu/2863
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
[ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
- user model changes: no
- storage format changes: no
- interface changes: no
Details:
- Currently it is possible for a thread to access
FileMapManager without holding the proper lock
and therefore seeing a stale state of the map.
This change ensures that all access to the map
is synchronized on the same lock.
Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
---
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
2 files changed, 7 insertions(+), 3 deletions(-)
git pull ssh://asterix-gerrit.ics.uci.edu:29418/asterixdb refs/changes/63/2863/1
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
index f8b9a57..b35cefe 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
@@ -849,9 +849,8 @@
if (LOGGER.isEnabled(fileOpsLevel)) {
LOGGER.log(fileOpsLevel, "Opening file: " + fileId + " in cache: " + this);
}
- BufferedFileHandle fInfo = null;
try {
- fInfo = getOrCreateFileHandle(fileId);
+ final BufferedFileHandle fInfo = getOrCreateFileHandle(fileId);
if (fInfo.getFileHandle() == null) {
// a new file
synchronized (fInfo) {
@@ -861,7 +860,10 @@
closeOpeningFiles(fInfo);
}
// create, open, and map new file reference
- FileReference fileRef = fileMapManager.lookupFileName(fileId);
+ FileReference fileRef;
+ synchronized (fileInfoMap) {
+ fileRef = fileMapManager.lookupFileName(fileId);
+ }
IFileHandle fh = ioManager.open(fileRef, IIOManager.FileReadWriteMode.READ_WRITE,
IIOManager.FileSyncMode.METADATA_ASYNC_DATA_ASYNC);
fInfo.setFileHandle(fh);
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
index 32922d2..0f2703b 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
@@ -25,7 +25,9 @@
import org.apache.hyracks.api.exceptions.ErrorCode;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.api.io.FileReference;
+import org.apache.hyracks.util.annotations.NotThreadSafe;
+@NotThreadSafe
public class FileMapManager implements IFileMapManager {
private static final long serialVersionUID = 1L;
--
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Gerrit-Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
Gerrit-PatchSet: 1
Gerrit-Project: asterixdb
Gerrit-Branch: master
Gerrit-Owner: Murtadha Hubail <mh...@apache.org>
Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-sonar/8196/ (5/13)
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-verify-storage/4811/ (1/13)
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org>.
Hello Jenkins,
I'd like you to reexamine a change. Please visit
https://asterix-gerrit.ics.uci.edu/2863
to look at the new patch set (#2).
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
[ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
- user model changes: no
- storage format changes: no
- interface changes: no
Details:
- Currently it is possible for a thread to access
FileMapManager without holding the proper lock
and therefore seeing a stale state of the map.
This change ensures that all access to the map
is synchronized on the same lock.
Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
---
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
3 files changed, 8 insertions(+), 4 deletions(-)
git pull ssh://asterix-gerrit.ics.uci.edu:29418/asterixdb refs/changes/63/2863/2
--
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Gerrit-Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
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Gerrit-Project: asterixdb
Gerrit-Branch: master
Gerrit-Owner: Murtadha Hubail <mh...@apache.org>
Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>
Gerrit-Reviewer: Michael Blow <mb...@apache.org>
Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Anon. E. Moose (Code Review)" <do...@asterixdb.incubator.apache.org>.
Anon. E. Moose #1000171 has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Analytics Compatibility Compilation Successful
https://goo.gl/pxfYsE : SUCCESS
--
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Gerrit-Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
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Gerrit-Owner: Murtadha Hubail <mh...@apache.org>
Gerrit-Reviewer: Anon. E. Moose #1000171
Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>
Gerrit-Reviewer: Michael Blow <mb...@apache.org>
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-asterix-app-java10/488/ (8/13)
--
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Gerrit-HasComments: No
Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-asterix-app-sql-execution/4264/ (1/13)
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-cancellation-test/4257/ (2/13)
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-source-assemblies/4481/ (2/13)
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org>.
Murtadha Hubail has submitted this change and it was merged.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
[ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
- user model changes: no
- storage format changes: no
- interface changes: no
Details:
- Currently it is possible for a thread to access
FileMapManager without holding the proper lock
and therefore seeing a stale state of the map.
This change ensures that all access to the map
is synchronized on the same lock.
Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2863
Sonar-Qube: Jenkins <je...@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <je...@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <je...@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <je...@fulliautomatix.ics.uci.edu>
Reviewed-by: abdullah alamoudi <ba...@gmail.com>
---
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java
M hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
3 files changed, 8 insertions(+), 4 deletions(-)
Approvals:
Anon. E. Moose #1000171:
abdullah alamoudi: Looks good to me, approved
Jenkins: Verified; No violations found; ; Verified
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
index f8b9a57..b35cefe 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
@@ -849,9 +849,8 @@
if (LOGGER.isEnabled(fileOpsLevel)) {
LOGGER.log(fileOpsLevel, "Opening file: " + fileId + " in cache: " + this);
}
- BufferedFileHandle fInfo = null;
try {
- fInfo = getOrCreateFileHandle(fileId);
+ final BufferedFileHandle fInfo = getOrCreateFileHandle(fileId);
if (fInfo.getFileHandle() == null) {
// a new file
synchronized (fInfo) {
@@ -861,7 +860,10 @@
closeOpeningFiles(fInfo);
}
// create, open, and map new file reference
- FileReference fileRef = fileMapManager.lookupFileName(fileId);
+ FileReference fileRef;
+ synchronized (fileInfoMap) {
+ fileRef = fileMapManager.lookupFileName(fileId);
+ }
IFileHandle fh = ioManager.open(fileRef, IIOManager.FileReadWriteMode.READ_WRITE,
IIOManager.FileSyncMode.METADATA_ASYNC_DATA_ASYNC);
fInfo.setFileHandle(fh);
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java
index 1312d97..4f15588 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/BufferedFileHandle.java
@@ -24,7 +24,7 @@
public class BufferedFileHandle {
private final int fileId;
- private IFileHandle handle;
+ private volatile IFileHandle handle;
private final AtomicInteger refCount;
public BufferedFileHandle(int fileId, IFileHandle handle) {
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
index 32922d2..0f2703b 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/FileMapManager.java
@@ -25,7 +25,9 @@
import org.apache.hyracks.api.exceptions.ErrorCode;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.api.io.FileReference;
+import org.apache.hyracks.util.annotations.NotThreadSafe;
+@NotThreadSafe
public class FileMapManager implements IFileMapManager {
private static final long serialVersionUID = 1L;
--
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Gerrit-Change-Id: Iea7fdb0b891b4ba2aaa528b42eab47b6f841672d
Gerrit-PatchSet: 3
Gerrit-Project: asterixdb
Gerrit-Branch: master
Gerrit-Owner: Murtadha Hubail <mh...@apache.org>
Gerrit-Reviewer: Anon. E. Moose #1000171
Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>
Gerrit-Reviewer: Michael Blow <mb...@apache.org>
Gerrit-Reviewer: Murtadha Hubail <mh...@apache.org>
Gerrit-Reviewer: abdullah alamoudi <ba...@gmail.com>
Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-verify-asterix-app/4670/ (3/13)
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
BAD Compatibility Tests Started https://asterix-jenkins.ics.uci.edu/job/asterixbad-compat/3548/
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-sonar/8194/ (6/13)
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Anon. E. Moose (Code Review)" <do...@asterixdb.incubator.apache.org>.
Anon. E. Moose #1000171 has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2: Contrib+1
Analytics Compatibility Tests Successful
https://goo.gl/2R5wrS : SUCCESS
--
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Anon. E. Moose (Code Review)" <do...@asterixdb.incubator.apache.org>.
Anon. E. Moose #1000171 has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Analytics Compatibility Compilation Successful
https://goo.gl/cpZt4g : SUCCESS
--
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
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Patch Set 2: Contrib+1
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
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Patch Set 2:
(1 comment)
https://asterix-gerrit.ics.uci.edu/#/c/2863/1/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
File hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java:
PS1, Line 854: if (fInfo.getFileHandle() == null) {
: // a new file
: synchronized (fInfo) {
: // prevent concurrent opening of the same file
: if (fInfo.getFileHandle() == null) {
> double-checked locking, this is not safe
Done
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2: Code-Review+2
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1: Contrib-2
Analytics Compatibility Tests Failed
https://goo.gl/ynbYu2 : UNSTABLE
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
(1 comment)
https://asterix-gerrit.ics.uci.edu/#/c/2863/1/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
File hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java:
PS1, Line 854: if (fInfo.getFileHandle() == null) {
: // a new file
: synchronized (fInfo) {
: // prevent concurrent opening of the same file
: if (fInfo.getFileHandle() == null) {
double-checked locking, this is not safe
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......................................................................
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......................................................................
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
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Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
BAD Compatibility Tests Started https://asterix-jenkins.ics.uci.edu/job/asterixbad-compat/3550/
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1: Contrib+1
BAD Compatibility Tests Successful
https://asterix-jenkins.ics.uci.edu/job/asterixbad-compat/3548/ : SUCCESS
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1: Integration-Tests+1
Integration Tests Successful
https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-integration-tests/7098/ : SUCCESS
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/hyracks-gerrit/4171/ (6/13)
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/hyracks-gerrit/4169/ (7/13)
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Change in asterixdb[master]: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMap...
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [ASTERIXDB-2398][STO] Ensure No Concurrent Access to FileMapManager
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-cancellation-test/4259/ (4/13)
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