[ 
https://issues.apache.org/jira/browse/LOG4J2-2140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yasas Gunarathne updated LOG4J2-2140:
-------------------------------------
    Description: 
When using *NoSql* Appender with a *bufferSize* configured *MutableLogEvent* 
instances get overwritten while they are still in the *buffer* of 
*AbstractDatabaseManager*. Here are the steps to recreate the issue.

*log4j2.xml* file I used is as below.

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>

<Configuration xmlns="http://logging.apache.org/log4j/2.0/config";>
    <Loggers>
        <Logger name="test.TestOne" level="DEBUG">
            <AppenderRef ref="NoSql"/>
        </Logger>
    </Loggers>
    <Appenders>
        <NoSql name="NoSql" bufferSize="100">
            <MongoDb databaseName="test" collectionName="sampleLogs" 
server="localhost" />
        </NoSql>
    </Appenders>
</Configuration>
{code}

This is the sample program.

{code:java}
package test;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class TestOne {

    private static final Logger logger = LogManager.getLogger(TestOne.class);

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            logger.debug("Test: " + i);
        }
    }
}
{code}

And here are some of the results I got when querying the MongoDB collection 
after running the above sample program.

{noformat}

{
  "_id": ObjectId(
  "5a24d2d332fc4edab1eceb21"
  ),
  "level": "DEBUG",
  "loggerName": "test.TestOne",
  "message": "Test: 99",
  "source": {
    "className": "test.TestOne",
    "methodName": "main",
    "fileName": "TestOne.java",
    "lineNumber": 12
  },
  "marker": null,
  "threadId": NumberLong(1),
  "threadName": "main",
  "threadPriority": 5,
  "millis": NumberLong(
  "1512362702533"
  ),
  "date": ISODate(
  "2017-12-04T04:45:02.533Z"
  ),
  "thrown": null,
  "contextMap": {},
  "contextStack": []
}
{
  "_id": ObjectId(
  "5a24d2d532fc4edab1eceb22"
  ),
  "level": "DEBUG",
  "loggerName": "test.TestOne",
  "message": "Test: 99",
  "source": {
    "className": "test.TestOne",
    "methodName": "main",
    "fileName": "TestOne.java",
    "lineNumber": 12
  },
  "marker": null,
  "threadId": NumberLong(1),
  "threadName": "main",
  "threadPriority": 5,
  "millis": NumberLong(
  "1512362702533"
  ),
  "date": ISODate(
  "2017-12-04T04:45:02.533Z"
  ),
  "thrown": null,
  "contextMap": {},
  "contextStack": []
}
{
  "_id": ObjectId(
  "5a24d2dc32fc4edab1eceb23"
  ),
  "level": "DEBUG",
  "loggerName": "test.TestOne",
  "message": "Test: 99",
  "source": {
    "className": "test.TestOne",
    "methodName": "main",
    "fileName": "TestOne.java",
    "lineNumber": 12
  },
  "marker": null,
  "threadId": NumberLong(1),
  "threadName": "main",
  "threadPriority": 5,
  "millis": NumberLong(
  "1512362702533"
  ),
  "date": ISODate(
  "2017-12-04T04:45:02.533Z"
  ),
  "thrown": null,
  "contextMap": {},
  "contextStack": []
}
{noformat}



  was:
When using *NoSql* Appender with a *bufferSize* configured *MutableLogEvent* 
instances get overwritten while they are still in the *buffer* of 
*AbstractDatabaseManager*. Here are the steps to recreate the issue.

*log4j2.xml* file I used is as below.

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>

<Configuration xmlns="http://logging.apache.org/log4j/2.0/config";>
    <Loggers>
        <Logger name="test.TestOne" level="DEBUG">
            <AppenderRef ref="NoSql"/>
        </Logger>
    </Loggers>
    <Appenders>
        <NoSql name="NoSql" bufferSize="100">
            <MongoDb databaseName="test" collectionName="sampleLogs" 
server="localhost" />
        </NoSql>
    </Appenders>
</Configuration>
{code}

This is the sample program.

{code:java}
package test;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class TestOne {

    private static final Logger logger = LogManager.getLogger(TestOne.class);

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            logger.debug("Test: " + i);
        }
    }
}
{code}

And here are some of the results I got when querying the MongoDB collection 
after running the above sample program.

{color:#707070}{ "_id" : ObjectId("5a24d2d332fc4edab1eceb21"), "level" : 
"DEBUG", "loggerName" : "test.TestOne", "message" : "Test: 99", "source" : { 
"className" : "test.TestOne", "methodName" : "main", "fileName" : 
"TestOne.java", "lineNumber" : 12 }, "marker" : null, "threadId" : 
NumberLong(1), "threadName" : "main", "threadPriority" : 5, "millis" : 
NumberLong("1512362702533"), "date" : ISODate("2017-12-04T04:45:02.533Z"), 
"thrown" : null, "contextMap" : {  }, "contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2d532fc4edab1eceb22"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2dc32fc4edab1eceb23"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2dc32fc4edab1eceb24"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2dc32fc4edab1eceb25"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2dc32fc4edab1eceb26"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }
{ "_id" : ObjectId("5a24d2dc32fc4edab1eceb27"), "level" : "DEBUG", "loggerName" 
: "test.TestOne", "message" : "Test: 99", "source" : { "className" : 
"test.TestOne", "methodName" : "main", "fileName" : "TestOne.java", 
"lineNumber" : 12 }, "marker" : null, "threadId" : NumberLong(1), "threadName" 
: "main", "threadPriority" : 5, "millis" : NumberLong("1512362702533"), "date" 
: ISODate("2017-12-04T04:45:02.533Z"), "thrown" : null, "contextMap" : {  }, 
"contextStack" : [ ] }{color}



> MutableLogEvent instances get overwritten before flushing when using a NoSql 
> Appender with a bufferSize
> -------------------------------------------------------------------------------------------------------
>
>                 Key: LOG4J2-2140
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2140
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 2.9.1
>         Environment: Windows 10 with MongoDB Server 3.4
>            Reporter: Yasas Gunarathne
>
> When using *NoSql* Appender with a *bufferSize* configured *MutableLogEvent* 
> instances get overwritten while they are still in the *buffer* of 
> *AbstractDatabaseManager*. Here are the steps to recreate the issue.
> *log4j2.xml* file I used is as below.
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration xmlns="http://logging.apache.org/log4j/2.0/config";>
>     <Loggers>
>         <Logger name="test.TestOne" level="DEBUG">
>             <AppenderRef ref="NoSql"/>
>         </Logger>
>     </Loggers>
>     <Appenders>
>         <NoSql name="NoSql" bufferSize="100">
>             <MongoDb databaseName="test" collectionName="sampleLogs" 
> server="localhost" />
>         </NoSql>
>     </Appenders>
> </Configuration>
> {code}
> This is the sample program.
> {code:java}
> package test;
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> public class TestOne {
>     private static final Logger logger = LogManager.getLogger(TestOne.class);
>     public static void main(String[] args) {
>         for (int i = 0; i < 100; i++) {
>             logger.debug("Test: " + i);
>         }
>     }
> }
> {code}
> And here are some of the results I got when querying the MongoDB collection 
> after running the above sample program.
> {noformat}
> {
>   "_id": ObjectId(
>   "5a24d2d332fc4edab1eceb21"
>   ),
>   "level": "DEBUG",
>   "loggerName": "test.TestOne",
>   "message": "Test: 99",
>   "source": {
>     "className": "test.TestOne",
>     "methodName": "main",
>     "fileName": "TestOne.java",
>     "lineNumber": 12
>   },
>   "marker": null,
>   "threadId": NumberLong(1),
>   "threadName": "main",
>   "threadPriority": 5,
>   "millis": NumberLong(
>   "1512362702533"
>   ),
>   "date": ISODate(
>   "2017-12-04T04:45:02.533Z"
>   ),
>   "thrown": null,
>   "contextMap": {},
>   "contextStack": []
> }
> {
>   "_id": ObjectId(
>   "5a24d2d532fc4edab1eceb22"
>   ),
>   "level": "DEBUG",
>   "loggerName": "test.TestOne",
>   "message": "Test: 99",
>   "source": {
>     "className": "test.TestOne",
>     "methodName": "main",
>     "fileName": "TestOne.java",
>     "lineNumber": 12
>   },
>   "marker": null,
>   "threadId": NumberLong(1),
>   "threadName": "main",
>   "threadPriority": 5,
>   "millis": NumberLong(
>   "1512362702533"
>   ),
>   "date": ISODate(
>   "2017-12-04T04:45:02.533Z"
>   ),
>   "thrown": null,
>   "contextMap": {},
>   "contextStack": []
> }
> {
>   "_id": ObjectId(
>   "5a24d2dc32fc4edab1eceb23"
>   ),
>   "level": "DEBUG",
>   "loggerName": "test.TestOne",
>   "message": "Test: 99",
>   "source": {
>     "className": "test.TestOne",
>     "methodName": "main",
>     "fileName": "TestOne.java",
>     "lineNumber": 12
>   },
>   "marker": null,
>   "threadId": NumberLong(1),
>   "threadName": "main",
>   "threadPriority": 5,
>   "millis": NumberLong(
>   "1512362702533"
>   ),
>   "date": ISODate(
>   "2017-12-04T04:45:02.533Z"
>   ),
>   "thrown": null,
>   "contextMap": {},
>   "contextStack": []
> }
> {noformat}



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