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https://issues.apache.org/jira/browse/BEAM-3301?focusedWorklogId=408380&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-408380
]
ASF GitHub Bot logged work on BEAM-3301:
----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Mar/20 23:02
Start Date: 23/Mar/20 23:02
Worklog Time Spent: 10m
Work Description: lostluck commented on pull request #11188: [BEAM-3301]
Adding restriction trackers and validation.
URL: https://github.com/apache/beam/pull/11188#discussion_r396804143
##########
File path: sdks/go/pkg/beam/core/sdf/sdf.go
##########
@@ -0,0 +1,74 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package sdf is experimental, incomplete, and not yet meant for general
usage.
+package sdf
+
+// RTracker is an interface used to interact with restrictions while
processing elements in
+// SplittableDoFns. Each implementation of RTracker is expected to be used for
tracking a single
+// restriction type, which is the type that should be used to create the
RTracker, and output by
+// TrySplit.
+type RTracker interface {
+ // TryClaim attempts to claim the block of work in the current
restriction located at a given
+ // position. This method must be used in the ProcessElement method of
Splittable DoFns to claim
+ // work before performing it. If no work is claimed, the ProcessElement
is not allowed to perform
+ // work or emit outputs. If the claim is successful, the DoFn must
process the entire block. If
+ // the claim is unsuccessful the ProcessElement method of the DoFn must
return without performing
+ // any additional work or emitting any outputs.
+ //
+ // TryClaim accepts an arbitrary value that can be interpreted as the
position of a block, and
+ // returns a boolean indicating whether the claim succeeded.
+ //
+ // If the claim fails due to an error, that error can be retrieved with
GetError.
+ //
+ // For SDFs to work properly, claims must always be monotonically
increasing in reference to the
+ // restriction's start and end points, and every block of work in a
restriction must be claimed.
+ //
+ // This pseudocode example illustrates the typical usage of TryClaim:
+ //
+ // pos = position of first block after restriction.start
+ // for TryClaim(pos) == true {
+ // // Do all work in the claimed block and emit outputs.
+ // pos = position of next block
+ // }
+ // return
+ TryClaim(pos interface{}) (ok bool)
+
+ // GetError returns the error that made this RTracker stop executing,
and it returns null if no
Review comment:
returns nil*
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Issue Time Tracking
-------------------
Worklog Id: (was: 408380)
Time Spent: 9h (was: 8h 50m)
> Go SplittableDoFn support
> -------------------------
>
> Key: BEAM-3301
> URL: https://issues.apache.org/jira/browse/BEAM-3301
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Henning Rohde
> Assignee: Daniel Oliveira
> Priority: Major
> Time Spent: 9h
> Remaining Estimate: 0h
>
> SDFs will be the only way to add streaming and liquid sharded IO for Go.
> Design doc: https://s.apache.org/splittable-do-fn
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