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Posted to notifications@asterixdb.apache.org by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org> on 2017/11/19 00:49:39 UTC
Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Murtadha Hubail has uploaded a new change for review.
https://asterix-gerrit.ics.uci.edu/2165
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
[NO ISSUE][TX] Make TxnLogFile Close Idempotent
- user model changes: no
- storage format changes: no
- interface changes: yes
Renamed ILogReader.initializeScan to setPosition and added
javadocs.
Details:
Currently there is an explicit check that the file channel
of a TxnLogFile is open before closing it. However, the
channel could be closed due to interrupts and therefore
we should remove the explicit check and always try to close
it. However, we should always decrement the TxnLogFile
references counter even if the channel is not open since
that TxnLogFile is not accessed anymore.
Change-Id: I255e4b9af0bc78298c0a25daf0b5629d413eba6a
---
M asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
M asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
4 files changed, 47 insertions(+), 47 deletions(-)
git pull ssh://asterix-gerrit.ics.uci.edu:29418/asterixdb refs/changes/65/2165/1
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
index 7bc5697..19966fe 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
@@ -201,7 +201,7 @@
jobId2WinnerEntitiesMap = new HashMap<>();
//set log reader to the lowWaterMarkLsn
ILogRecord logRecord;
- logReader.initializeScan(lowWaterMarkLSN);
+ logReader.setPosition(lowWaterMarkLSN);
logRecord = logReader.next();
while (logRecord != null) {
if (IS_DEBUG_MODE) {
@@ -300,7 +300,7 @@
ILogRecord logRecord = null;
try {
- logReader.initializeScan(lowWaterMarkLSN);
+ logReader.setPosition(lowWaterMarkLSN);
logRecord = logReader.next();
while (logRecord != null) {
if (IS_DEBUG_MODE) {
@@ -540,7 +540,7 @@
Set<Integer> activePartitions = localResourceRepository.getActivePartitions();
ILogReader logReader = logMgr.getLogReader(false);
try {
- logReader.initializeScan(firstLSN);
+ logReader.setPosition(firstLSN);
ILogRecord logRecord = null;
while (currentLSN < lastLSN) {
logRecord = logReader.next();
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
index da188e3..8539e2b 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
@@ -18,18 +18,34 @@
*/
package org.apache.asterix.common.transactions;
-import org.apache.asterix.common.exceptions.ACIDException;
-
public interface ILogReader {
- public void initializeScan(long beginLSN) throws ACIDException;
+ /**
+ * Sets the log reader position at log sequence number with value {@code lsn}.
+ *
+ * @param lsn
+ */
+ void setPosition(long lsn);
- //for scanning
- public ILogRecord next() throws ACIDException;
+ /**
+ * Reads and returns the log record located at the log reader current position. After reading the log record,
+ * the log reader position is incremented by the size of the read log.
+ *
+ * @return the log record
+ */
+ ILogRecord next();
- //for random reading
- public ILogRecord read(long readLSN) throws ACIDException;
+ /**
+ * Reads and returns the log record with log sequence number {@code lsn}.
+ *
+ * @param lsn
+ * @return The log record
+ */
+ ILogRecord read(long lsn);
- public void close() throws ACIDException;
+ /**
+ * Closes the log reader and any resources used.
+ */
+ void close();
-}
+}
\ No newline at end of file
diff --git a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
index dd0a5c7..1cf7a50 100644
--- a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
+++ b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
@@ -579,9 +579,6 @@
@Override
public void closeLogFile(TxnLogFile logFileRef, FileChannel fileChannel) throws IOException {
- if (!fileChannel.isOpen()) {
- throw new IllegalStateException("File channel is not open");
- }
fileChannel.close();
untouchLogFile(logFileRef.getLogFileId());
}
diff --git a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
index 148aa7e..4994134 100644
--- a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
+++ b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
@@ -30,14 +30,11 @@
import org.apache.asterix.common.transactions.LogRecord;
import org.apache.asterix.common.transactions.MutableLong;
import org.apache.asterix.common.transactions.TxnLogFile;
+import org.apache.hyracks.util.annotations.NotThreadSafe;
-/**
- * NOTE: Many method calls of this class are not thread safe.
- * Be very cautious using it in a multithreaded context.
- */
+@NotThreadSafe
public class LogReader implements ILogReader {
- public static final boolean IS_DEBUG_MODE = false;//true
private static final Logger LOGGER = Logger.getLogger(LogReader.class.getName());
private final ILogManager logMgr;
private final long logFileSize;
@@ -54,7 +51,7 @@
private enum ReturnState {
FLUSH,
EOF
- };
+ }
public LogReader(ILogManager logMgr, long logFileSize, int logPageSize, MutableLong flushLSN,
boolean isRecoveryMode) {
@@ -68,8 +65,8 @@
}
@Override
- public void initializeScan(long beginLSN) throws ACIDException {
- readLSN = beginLSN;
+ public void setPosition(long lsn) {
+ readLSN = lsn;
if (waitForFlushOrReturnIfEOF() == ReturnState.EOF) {
return;
}
@@ -84,7 +81,7 @@
* @throws ACIDException
*/
@Override
- public ILogRecord next() throws ACIDException {
+ public ILogRecord next() {
if (waitForFlushOrReturnIfEOF() == ReturnState.EOF) {
return null;
}
@@ -147,13 +144,10 @@
return ReturnState.EOF;
}
try {
- if (IS_DEBUG_MODE) {
- LOGGER.info(
- "waitForFlushOrReturnIfEOF()| flushLSN: " + flushLSN.get() + ", readLSN: " + readLSN);
- }
flushLSN.wait();
} catch (InterruptedException e) {
- //ignore
+ Thread.currentThread().interrupt();
+ throw new ACIDException(e);
}
}
return ReturnState.FLUSH;
@@ -166,10 +160,9 @@
* @return true if log continues, false if EOF
* @throws ACIDException
*/
- private boolean refillLogReadBuffer() throws ACIDException {
+ private boolean refillLogReadBuffer() {
try {
if (readLSN % logFileSize == logFile.size()) {
- logFile.close();
readLSN += logFileSize - (readLSN % logFileSize);
getLogFile();
}
@@ -183,14 +176,12 @@
* Fills the log buffer with data from the log file at the current position
*
* @return false if EOF, true otherwise
- * @throws ACIDException
*/
-
- private boolean fillLogReadBuffer() throws ACIDException {
+ private boolean fillLogReadBuffer() {
return fillLogReadBuffer(logPageSize, readBuffer);
}
- private boolean fillLogReadBuffer(int readSize, ByteBuffer readBuffer) throws ACIDException {
+ private boolean fillLogReadBuffer(int readSize, ByteBuffer readBuffer) {
int size = 0;
int read = 0;
readBuffer.position(0);
@@ -217,10 +208,9 @@
return true;
}
- //for random reading
@Override
- public ILogRecord read(long LSN) throws ACIDException {
- readLSN = LSN;
+ public ILogRecord read(long lsn) {
+ readLSN = lsn;
//wait for the log to be flushed if needed before trying to read it.
synchronized (flushLSN) {
while (readLSN >= flushLSN.get()) {
@@ -232,13 +222,8 @@
}
}
try {
- if (logFile == null) {
+ if (logFile == null || readLSN < fileBeginLSN || readLSN >= fileBeginLSN + logFile.size()) {
//get the log file which contains readLSN
- getLogFile();
- fillLogReadBuffer();
- } else if (readLSN < fileBeginLSN || readLSN >= fileBeginLSN + logFile.size()) {
- //log is not in the current log file
- logFile.close();
getLogFile();
fillLogReadBuffer();
} else if (readLSN < bufferBeginLSN || readLSN >= bufferBeginLSN + readBuffer.limit()) {
@@ -265,7 +250,7 @@
case TRUNCATED: {
if (!fillLogReadBuffer()) {
throw new IllegalStateException(
- "Could not read LSN(" + LSN + ") from log file id " + logFile.getLogFileId());
+ "Could not read LSN(" + lsn + ") from log file id " + logFile.getLogFileId());
}
//now read the complete log record
continue;
@@ -285,8 +270,10 @@
return logRecord;
}
- private void getLogFile() throws ACIDException {
+ private void getLogFile() {
try {
+ // close existing file (if any) before opening another one
+ close();
logFile = logMgr.getLogFile(readLSN);
fileBeginLSN = logFile.getFileBeginLSN();
} catch (IOException e) {
@@ -295,7 +282,7 @@
}
@Override
- public void close() throws ACIDException {
+ public void close() {
try {
if (logFile != null) {
logFile.close();
--
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I255e4b9af0bc78298c0a25daf0b5629d413eba6a
Gerrit-PatchSet: 1
Gerrit-Project: asterixdb
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Gerrit-Owner: Murtadha Hubail <mh...@apache.org>
Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-verify-storage/2269/ (7/11)
--
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Gerrit-Reviewer: Anon. E. Moose #1000171
Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/hyracks-gerrit/1628/ (5/11)
--
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-asterix-app/2522/ (10/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org>.
Hello Anon. E. Moose #1000171, Jenkins,
I'd like you to reexamine a change. Please visit
https://asterix-gerrit.ics.uci.edu/2165
to look at the new patch set (#2).
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
[NO ISSUE][TX] Make TxnLogFile Close Idempotent
- user model changes: no
- storage format changes: no
- interface changes: yes
Renamed ILogReader.initializeScan to setPosition and added
javadocs.
Details:
Currently there is an explicit check that the file channel
of a TxnLogFile is open before closing it. However, the
channel could be closed due to interrupts and therefore
we should remove the explicit check and always try to close
it. However, we should always decrement the TxnLogFile
references counter even if the channel is not open since
that TxnLogFile is not accessed anymore.
Change-Id: I255e4b9af0bc78298c0a25daf0b5629d413eba6a
---
M asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
M asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
4 files changed, 49 insertions(+), 45 deletions(-)
git pull ssh://asterix-gerrit.ics.uci.edu:29418/asterixdb refs/changes/65/2165/2
--
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Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>
Gerrit-Reviewer: Michael Blow <mb...@apache.org>
Gerrit-Reviewer: Till Westmann <ti...@apache.org>
Gerrit-Reviewer: abdullah alamoudi <ba...@gmail.com>
Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-rebalance-cancellation/827/ (8/11)
--
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Till Westmann (Code Review)" <do...@asterixdb.incubator.apache.org>.
Till Westmann has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
(3 comments)
https://asterix-gerrit.ics.uci.edu/#/c/2165/1/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
File asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java:
PS1, Line 582:
:
:
Should we warn here? Or do we need to consider this a "regular case"?
https://asterix-gerrit.ics.uci.edu/#/c/2165/1/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
File asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java:
PS1, Line 150: ACIDException
What happens if we stop here instead of ignoring the interrupt and continuing until we reach the flushLSN?
PS1, Line 288: logFile.close()
Should we set logFile to null here or do we still need it?
--
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Gerrit-Reviewer: abdullah alamoudi <ba...@gmail.com>
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-verify-no-installer-app/2297/ (6/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Anon. E. Moose (Code Review)" <do...@asterixdb.incubator.apache.org>.
Anon. E. Moose #1000171 has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2: Contrib-2
Analytics Compatibility Tests Failed Build 2998
: UNSTABLE
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/hyracks-gerrit/1642/ (5/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-asterix-app/2508/ (2/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Till Westmann (Code Review)" <do...@asterixdb.incubator.apache.org>.
Till Westmann has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2: Code-Review+2
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
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Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
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(3 comments)
https://asterix-gerrit.ics.uci.edu/#/c/2165/1/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
File asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java:
PS1, Line 582:
:
:
> Should we warn here? Or do we need to consider this a "regular case"?
It is a rare regular case. Logging it wouldn't do any harm and might help us in debugging one day. I will add the log.
https://asterix-gerrit.ics.uci.edu/#/c/2165/1/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
File asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java:
PS1, Line 150: ACIDException
> What happens if we stop here instead of ignoring the interrupt and continui
This would be a txn abort thread waiting for the flushLSN. If such thread is interrupt, it means that we are shutting down the NC, therefore, when the NC starts up, recovery will redo the committed records and there wont be anything to undo. I think this is better than leaving the thread waiting during shutdown.
PS1, Line 288: logFile.close()
> Should we set logFile to null here or do we still need it?
This is assuming that the caller would adhere to the contract of ILogReader (i.e. close will be called when the logReader will no longer be used. However, calling close twice on the same log file has no effect since there is protection against that in TxnLogFile#close. It is similar to calling close multiple times on a file channel. Setting it to null wouldn't harm too. Done.
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
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Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-asterix-app-sql-execution/1647/ (10/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
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Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1: Contrib+2
BAD Compatibility Tests Successful
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Murtadha Hubail (Code Review)" <do...@asterixdb.incubator.apache.org>.
Murtadha Hubail has submitted this change and it was merged.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
[NO ISSUE][TX] Make TxnLogFile Close Idempotent
- user model changes: no
- storage format changes: no
- interface changes: yes
Renamed ILogReader.initializeScan to setPosition and added
javadocs.
Details:
Currently there is an explicit check that the file channel
of a TxnLogFile is open before closing it. However, the
channel could be closed due to interrupts and therefore
we should remove the explicit check and always try to close
it. However, we should always decrement the TxnLogFile
references counter even if the channel is not open since
that TxnLogFile is not accessed anymore.
Change-Id: I255e4b9af0bc78298c0a25daf0b5629d413eba6a
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2165
Reviewed-by: Till Westmann <ti...@apache.org>
Sonar-Qube: Jenkins <je...@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <je...@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <je...@fulliautomatix.ics.uci.edu>
---
M asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
M asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
M asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
4 files changed, 49 insertions(+), 45 deletions(-)
Approvals:
Anon. E. Moose #1000171: No violations found
Till Westmann: Looks good to me, approved
Jenkins: Verified; No violations found; Verified
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
index 7bc5697..19966fe 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/app/nc/RecoveryManager.java
@@ -201,7 +201,7 @@
jobId2WinnerEntitiesMap = new HashMap<>();
//set log reader to the lowWaterMarkLsn
ILogRecord logRecord;
- logReader.initializeScan(lowWaterMarkLSN);
+ logReader.setPosition(lowWaterMarkLSN);
logRecord = logReader.next();
while (logRecord != null) {
if (IS_DEBUG_MODE) {
@@ -300,7 +300,7 @@
ILogRecord logRecord = null;
try {
- logReader.initializeScan(lowWaterMarkLSN);
+ logReader.setPosition(lowWaterMarkLSN);
logRecord = logReader.next();
while (logRecord != null) {
if (IS_DEBUG_MODE) {
@@ -540,7 +540,7 @@
Set<Integer> activePartitions = localResourceRepository.getActivePartitions();
ILogReader logReader = logMgr.getLogReader(false);
try {
- logReader.initializeScan(firstLSN);
+ logReader.setPosition(firstLSN);
ILogRecord logRecord = null;
while (currentLSN < lastLSN) {
logRecord = logReader.next();
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
index da188e3..8539e2b 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/transactions/ILogReader.java
@@ -18,18 +18,34 @@
*/
package org.apache.asterix.common.transactions;
-import org.apache.asterix.common.exceptions.ACIDException;
-
public interface ILogReader {
- public void initializeScan(long beginLSN) throws ACIDException;
+ /**
+ * Sets the log reader position at log sequence number with value {@code lsn}.
+ *
+ * @param lsn
+ */
+ void setPosition(long lsn);
- //for scanning
- public ILogRecord next() throws ACIDException;
+ /**
+ * Reads and returns the log record located at the log reader current position. After reading the log record,
+ * the log reader position is incremented by the size of the read log.
+ *
+ * @return the log record
+ */
+ ILogRecord next();
- //for random reading
- public ILogRecord read(long readLSN) throws ACIDException;
+ /**
+ * Reads and returns the log record with log sequence number {@code lsn}.
+ *
+ * @param lsn
+ * @return The log record
+ */
+ ILogRecord read(long lsn);
- public void close() throws ACIDException;
+ /**
+ * Closes the log reader and any resources used.
+ */
+ void close();
-}
+}
\ No newline at end of file
diff --git a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
index dd0a5c7..cdd957a 100644
--- a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
+++ b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogManager.java
@@ -580,7 +580,7 @@
@Override
public void closeLogFile(TxnLogFile logFileRef, FileChannel fileChannel) throws IOException {
if (!fileChannel.isOpen()) {
- throw new IllegalStateException("File channel is not open");
+ LOGGER.warning(() -> "Closing log file with id(" + logFileRef.getLogFileId() + ") with a closed channel.");
}
fileChannel.close();
untouchLogFile(logFileRef.getLogFileId());
diff --git a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
index 148aa7e..f2c5eef 100644
--- a/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
+++ b/asterixdb/asterix-transactions/src/main/java/org/apache/asterix/transaction/management/service/logging/LogReader.java
@@ -30,14 +30,11 @@
import org.apache.asterix.common.transactions.LogRecord;
import org.apache.asterix.common.transactions.MutableLong;
import org.apache.asterix.common.transactions.TxnLogFile;
+import org.apache.hyracks.util.annotations.NotThreadSafe;
-/**
- * NOTE: Many method calls of this class are not thread safe.
- * Be very cautious using it in a multithreaded context.
- */
+@NotThreadSafe
public class LogReader implements ILogReader {
- public static final boolean IS_DEBUG_MODE = false;//true
private static final Logger LOGGER = Logger.getLogger(LogReader.class.getName());
private final ILogManager logMgr;
private final long logFileSize;
@@ -54,7 +51,7 @@
private enum ReturnState {
FLUSH,
EOF
- };
+ }
public LogReader(ILogManager logMgr, long logFileSize, int logPageSize, MutableLong flushLSN,
boolean isRecoveryMode) {
@@ -68,8 +65,8 @@
}
@Override
- public void initializeScan(long beginLSN) throws ACIDException {
- readLSN = beginLSN;
+ public void setPosition(long lsn) {
+ readLSN = lsn;
if (waitForFlushOrReturnIfEOF() == ReturnState.EOF) {
return;
}
@@ -84,7 +81,7 @@
* @throws ACIDException
*/
@Override
- public ILogRecord next() throws ACIDException {
+ public ILogRecord next() {
if (waitForFlushOrReturnIfEOF() == ReturnState.EOF) {
return null;
}
@@ -147,13 +144,10 @@
return ReturnState.EOF;
}
try {
- if (IS_DEBUG_MODE) {
- LOGGER.info(
- "waitForFlushOrReturnIfEOF()| flushLSN: " + flushLSN.get() + ", readLSN: " + readLSN);
- }
flushLSN.wait();
} catch (InterruptedException e) {
- //ignore
+ Thread.currentThread().interrupt();
+ throw new ACIDException(e);
}
}
return ReturnState.FLUSH;
@@ -166,10 +160,9 @@
* @return true if log continues, false if EOF
* @throws ACIDException
*/
- private boolean refillLogReadBuffer() throws ACIDException {
+ private boolean refillLogReadBuffer() {
try {
if (readLSN % logFileSize == logFile.size()) {
- logFile.close();
readLSN += logFileSize - (readLSN % logFileSize);
getLogFile();
}
@@ -183,14 +176,12 @@
* Fills the log buffer with data from the log file at the current position
*
* @return false if EOF, true otherwise
- * @throws ACIDException
*/
-
- private boolean fillLogReadBuffer() throws ACIDException {
+ private boolean fillLogReadBuffer() {
return fillLogReadBuffer(logPageSize, readBuffer);
}
- private boolean fillLogReadBuffer(int readSize, ByteBuffer readBuffer) throws ACIDException {
+ private boolean fillLogReadBuffer(int readSize, ByteBuffer readBuffer) {
int size = 0;
int read = 0;
readBuffer.position(0);
@@ -217,10 +208,9 @@
return true;
}
- //for random reading
@Override
- public ILogRecord read(long LSN) throws ACIDException {
- readLSN = LSN;
+ public ILogRecord read(long lsn) {
+ readLSN = lsn;
//wait for the log to be flushed if needed before trying to read it.
synchronized (flushLSN) {
while (readLSN >= flushLSN.get()) {
@@ -232,13 +222,8 @@
}
}
try {
- if (logFile == null) {
+ if (logFile == null || readLSN < fileBeginLSN || readLSN >= fileBeginLSN + logFile.size()) {
//get the log file which contains readLSN
- getLogFile();
- fillLogReadBuffer();
- } else if (readLSN < fileBeginLSN || readLSN >= fileBeginLSN + logFile.size()) {
- //log is not in the current log file
- logFile.close();
getLogFile();
fillLogReadBuffer();
} else if (readLSN < bufferBeginLSN || readLSN >= bufferBeginLSN + readBuffer.limit()) {
@@ -265,7 +250,7 @@
case TRUNCATED: {
if (!fillLogReadBuffer()) {
throw new IllegalStateException(
- "Could not read LSN(" + LSN + ") from log file id " + logFile.getLogFileId());
+ "Could not read LSN(" + lsn + ") from log file id " + logFile.getLogFileId());
}
//now read the complete log record
continue;
@@ -285,8 +270,10 @@
return logRecord;
}
- private void getLogFile() throws ACIDException {
+ private void getLogFile() {
try {
+ // close existing file (if any) before opening another one
+ close();
logFile = logMgr.getLogFile(readLSN);
fileBeginLSN = logFile.getFileBeginLSN();
} catch (IOException e) {
@@ -295,10 +282,11 @@
}
@Override
- public void close() throws ACIDException {
+ public void close() {
try {
if (logFile != null) {
logFile.close();
+ logFile = null;
}
} catch (IOException e) {
throw new ACIDException(e);
--
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 1:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-verify-asterix-app/2319/ (4/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2:
BAD Compatibility Tests Started https://asterix-jenkins.ics.uci.edu/job/asterixbad-compat/2179/
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2:
Build Started https://asterix-jenkins.ics.uci.edu/job/asterix-gerrit-source-assemblies/1976/ (8/11)
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Change in asterixdb[master]: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
Posted by "Jenkins (Code Review)" <do...@asterixdb.incubator.apache.org>.
Jenkins has posted comments on this change.
Change subject: [NO ISSUE][TX] Make TxnLogFile Close Idempotent
......................................................................
Patch Set 2: -Contrib
BAD Compatibility Tests Successful
https://asterix-jenkins.ics.uci.edu/job/asterixbad-compat/2180/ : SUCCESS
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