private bool TryRelock(RemoteLockState remoteLockState)
{
var attempt = 1;
while (true)
{
try
{
using (metrics.CassandraImplRelockOp.NewContext(remoteLockState.ToString()))
{
var relocked = remoteLockImplementation.TryRelock(remoteLockState.LockId, remoteLockState.ThreadId);
if (!relocked)
{
logger.Error("Cannot relock. Possible lock metadata corruption for: {0}", remoteLockState);
}
return(relocked);
}
}
catch (Exception e)
{
var shortSleep = ThreadLocalRandom.Instance.Next(50 * (int)Math.Exp(Math.Min(attempt++, 5)));
logger.Warn(e, "remoteLockImplementation.Relock() failed for: {0}. Will sleep for {1} ms", remoteLockState, shortSleep);
Thread.Sleep(shortSleep);
}
}
}
private void Unlock(RemoteLockState remoteLockState)
{
lock (remoteLockState)
{
remoteLockState.NextKeepAliveMoment = null;
try
{
using (metrics.CassandraImplUnlockOp.NewContext(remoteLockState.ToString()))
{
if (!remoteLockImplementation.TryUnlock(remoteLockState.LockId, remoteLockState.ThreadId))
{
logger.Error("Cannot unlock. Possible lock metadata corruption for: {0}", remoteLockState);
}
}
}
catch (Exception e)
{
logger.Error(e, "remoteLockImplementation.Unlock() failed for: {0}", remoteLockState);
}
}
}
private bool TryRelock([NotNull] RemoteLockState remoteLockState)
{
var attempt = 1;
while (true)
{
var nextHeartbeatMoment = Timestamp.Now;
if (remoteLockState.HeartbeatMoment.Add(lockTtl.Multiply(0.5)) < nextHeartbeatMoment)
{
logger.Error("KeepLockAlive() freeze is detected on attempt #{0}. Signal LockAliveToken to prevent possible lock collision for: {1}", attempt, remoteLockState);
return(false);
}
try
{
using (metrics.CassandraImplRelockOp.NewContext(remoteLockState.ToString()))
{
var relocked = remoteLockImplementation.TryRelock(remoteLockState.LockId, remoteLockState.ThreadId);
if (relocked)
{
remoteLockState.HeartbeatMoment = nextHeartbeatMoment;
}
else
{
logger.Error("Cannot relock on attempt #{0}. Possible lock metadata corruption for: {1}", attempt, remoteLockState);
}
return(relocked);
}
}
catch (Exception e)
{
var shortSleep = ThreadLocalRandom.Instance.Next(50 * (int)Math.Exp(Math.Min(attempt++, 5)));
logger.Warn(e, "remoteLockImplementation.TryRelock() attempt #{0} failed for: {1}. Will sleep for {2} ms", attempt, remoteLockState, shortSleep);
Thread.Sleep(shortSleep);
}
}
}
