mp911de / lettuce / 1106

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Run cluster command redirects on event executor threads #340

Previously, cluster command redirects were executed on the I/O thread. This is most of the time not an issue but in cases where lettuce did not open a connection to the target host, a connection has to be established. This is a blocking operation which blocks the event loop. The new connection is assigned in some cases (depending on the connection/event loop assignment) to the event loop which currently executes the retry. This leads to a deadlock.

Command retries are scheduled now using the event executor thread group.

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