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There are no need to use file/NW for local tasks. Bypass it.
Revise ParallelSQLMapTask.

JDK sha-1 hashing is slow.
A faster sha-1 is required for fast bulkloading.

The old fault-tolerance scheme is disabled/removed in the current trunk.
We have to revise the replication scheme for a better fault-tolerance.

locking.VacuumingLockManager is buggy in a certain concurrent situations. 
It should be revised.

Support speculative execution of tasks.

Consistent-hashing is good at hash-partitioning of key/value pairs;
However, it is difficult to control the behavior when [churn rate
http://en.wikipedia.org/wiki/Churn_rate] is high and some problem happens.
The uncontrollable behavior is not good at a perspective of system management.

Need to change ReplicaCoordinator#configureReplica.

Currently, a task proceeds its work immediately after one of replication 
tasks succeeds.

If other replication tasks fail, the system should remove the failure nodes 
from replica.

See replication.ReplicateTaskJob#result for detail.

Support a Combinator function in mapper.

DBAccessor should use a connection pooling.