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From "Ivan Rakov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-8761) WAL fsync at rollover should be asynchronous in LOG_ONLY and BACKGROUND modes
Date Sat, 09 Jun 2018 10:07:00 GMT
Ivan Rakov created IGNITE-8761:

             Summary: WAL fsync at rollover should be asynchronous in LOG_ONLY and BACKGROUND
                 Key: IGNITE-8761
                 URL: https://issues.apache.org/jira/browse/IGNITE-8761
             Project: Ignite
          Issue Type: Improvement
          Components: persistence
            Reporter: Ivan Rakov
             Fix For: 2.6

Transactions may periodically hang for a few seconds in LOG_ONLY or BACKGROUND persistent
modes. Thread dumps show that threads are hanging on syncing previous WAL segment during rollover:
  java.lang.Thread.State: RUNNABLE
   at java.nio.MappedByteBuffer.force0(MappedByteBuffer.java:-1)
   at java.nio.MappedByteBuffer.force(MappedByteBuffer.java:203)
   at org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$FileWriteHandle.close(FileWriteAheadLogManager.java:2843)
   at org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager$FileWriteHandle.access$600(FileWriteAheadLogManager.java:2483)
   at org.apache.ignite.internal.processors.cache.persistence.wal.FileWriteAheadLogManager.rollOver(FileWriteAheadLogManager.java:1094)
Waiting for this fsync is not necessary action to ensure crash recovery guarantees. Instead
of this, we should just perform fsyncs asychronously and ensure that they are completed prior
to next checkpoint start.

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