46fea317de
* Release shard lease after shutdown Currently, only local cached shard info has been removed when worker losts the lease. The info inside checkpointer (dynamoDB) is not removed. This causes lease has been hold until the lease expiration and it might take too long for shard is ready for other worker to grab. This change release the lease in checkpointer immediately. The user need to ensure appropriate checkpointing before return from Shutdown callback. Test: updated unit test and integration test to ensure only the shard owner has been wiped out and leave the checkpoint information intact. Signed-off-by: Tao Jiang <taoj@vmware.com> * Add code coverage reporting Add code coverage reporting for unit test. Signed-off-by: Tao Jiang <taoj@vmware.com>
71 lines
3.6 KiB
Go
71 lines
3.6 KiB
Go
/*
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* Copyright (c) 2018 VMware, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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* associated documentation files (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// The implementation is derived from https://github.com/patrobinson/gokini
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//
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// Copyright 2018 Patrick robinson
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package checkpoint
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import (
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"errors"
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par "github.com/vmware/vmware-go-kcl/clientlibrary/partition"
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)
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const (
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LEASE_KEY_KEY = "ShardID"
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LEASE_OWNER_KEY = "AssignedTo"
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LEASE_TIMEOUT_KEY = "LeaseTimeout"
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CHECKPOINT_SEQUENCE_NUMBER_KEY = "Checkpoint"
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PARENT_SHARD_ID_KEY = "ParentShardId"
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// We've completely processed all records in this shard.
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SHARD_END = "SHARD_END"
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// ErrLeaseNotAquired is returned when we failed to get a lock on the shard
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ErrLeaseNotAquired = "Lease is already held by another node"
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)
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// Checkpointer handles checkpointing when a record has been processed
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type Checkpointer interface {
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// Init initialises the Checkpoint
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Init() error
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// GetLease attempts to gain a lock on the given shard
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GetLease(*par.ShardStatus, string) error
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// CheckpointSequence writes a checkpoint at the designated sequence ID
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CheckpointSequence(*par.ShardStatus) error
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// FetchCheckpoint retrieves the checkpoint for the given shard
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FetchCheckpoint(*par.ShardStatus) error
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// RemoveLeaseInfo to remove lease info for shard entry because the shard no longer exists
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RemoveLeaseInfo(string) error
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// RemoveLeaseOwner to remove lease owner for the shard entry to make the shard available for reassignment
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RemoveLeaseOwner(string) error
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}
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// ErrSequenceIDNotFound is returned by FetchCheckpoint when no SequenceID is found
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var ErrSequenceIDNotFound = errors.New("SequenceIDNotFoundForShard")
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