Thread persisting in TextEncoderHelper.drainIfByteBufferFull

Issue

• We see many threads blocked in log4j2:

"default task-9" #268 prio=5 os_prio=0 tid=0x00007f4ac0121800 nid=0x4cd5 waiting for monitor entry [0x00007f4a73df9000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.checkRollover(RollingFileManager.java:251)
    - waiting to lock <0x0000000082c23cc0> (a org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager)
    at org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:239)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)

• The lock owning thread is persisting in calls like below:

"default task-8" #259 prio=5 os_prio=0 tid=0x00007f4aa45af800 nid=0x44d3 runnable [0x00007f4ab10cd000]
   java.lang.Thread.State: RUNNABLE
    at org.apache.logging.log4j.core.appender.OutputStreamManager.flushBuffer(OutputStreamManager.java:292)
    - locked <0x0000000082c23cc0> (a org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager)
    at org.apache.logging.log4j.core.appender.OutputStreamManager.drain(OutputStreamManager.java:351)
    at org.apache.logging.log4j.core.layout.TextEncoderHelper.drainIfByteBufferFull(TextEncoderHelper.java:260)
    - locked <0x0000000082c23cc0> (a org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager)
    at org.apache.logging.log4j.core.layout.TextEncoderHelper.writeAndEncodeAsMuchAsPossible(TextEncoderHelper.java:199)
    at org.apache.logging.log4j.core.layout.TextEncoderHelper.encodeChunkedText(TextEncoderHelper.java:159)
    - locked <0x0000000082c23cc0> (a org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager)
    at org.apache.logging.log4j.core.layout.TextEncoderHelper.encodeText(TextEncoderHelper.java:58)
    at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:68)
    at org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:32)
    at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:220)
    at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:58)
    at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:177)
    at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:170)
    at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:161)
    at org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:250)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)