[
https://issues.apache.org/jira/browse/BEAM-11097?focusedWorklogId=678674&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-678674
]
ASF GitHub Bot logged work on BEAM-11097:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Nov/21 18:59
Start Date: 08/Nov/21 18:59
Worklog Time Spent: 10m
Work Description: jrmccluskey commented on a change in pull request
#15896:
URL: https://github.com/apache/beam/pull/15896#discussion_r745009272
##########
File path: sdks/go/pkg/beam/util/hooksx/cache.go
##########
@@ -0,0 +1,40 @@
+// 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 hooksx defines user-facing entrypoints into Beam hooks, providing
+// input validation and removing potential errors arising from typos in hook
+// names. This also allows hook failures to occur earlier when the hook is
+// enabled, not when the hooks are called. All hooks that accept input from
+// users should have hooksx functions associated with them.
+package hooksx
+
+import (
+ "fmt"
+ "strconv"
+
+ "github.com/apache/beam/sdks/v2/go/pkg/beam/core/util/hooks"
+)
+
+// EnableSideInputCache accepts a desired maximum size for the side input
cache, validates that
+// it is non-negative, then formats the integer as a string to pass to
EnableHook. A size of 0
+// disables the cache. This hook is utilized in
pkg/beam/core/runtime/harness/harness.go when the
Review comment:
Done.
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Issue Time Tracking
-------------------
Worklog Id: (was: 678674)
Time Spent: 16h 40m (was: 16.5h)
> [Go SDK] Windowed Side Input Caching (Cross Bundle)
> ---------------------------------------------------
>
> Key: BEAM-11097
> URL: https://issues.apache.org/jira/browse/BEAM-11097
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Jack McCluskey
> Priority: P3
> Labels: starter
> Time Spent: 16h 40m
> Remaining Estimate: 0h
>
> This is implementing https://issues.apache.org/jira/browse/BEAM-5428 for the
> Go SDK.
> Side inputs are valid for given window. That means they can be and correctly
> cached and re-used in multiple bundles if the data has already been loaded
> into a given worker.
> Side input data for a given bundle is specified and keyed by the window and a
> a side input request token. The Go SDK presently doesn't use this information
> for a SDK side worker cache of data.
> Care needs to be taken to allow the data to be garbage collected if it hasn't
> been used in the last minute or so. In practice, Global Window side inputs
> will not be evicted while still in use, but infrequently accessed data will
> possibly be evicted more regularly. A limit should be set to avoid running
> out of memory.
> As presently implemented, each ProcessElement call (or StartBundle or
> FinishBundle) will only query for side input data on user request. However,
> results of user requests are not cached between elements or bundles, which
> means there's additional lookup and serialization time from the runner side.
> It may be possible to re-use allocated side input elements, but even a
> solution that re-decodes data on every call would be an improvement if the
> data isn't re-streamed from the runner.
> If https://issues.apache.org/jira/browse/BEAM-3293 has been implemented, then
> per-key+window caching should additionally be considered for more granular
> caching of data.
> This optimization has an outsized impact on streaming performance as side
> input data can change per bundle, and streaming bundles are typically small,
> and quickly processed.
> This work would be implemented in the exec package:
>
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/sideinput.go]
>
> and probably the harness package
>
> [https://github.com/apache/beam/blob/c185adb7652034b5d044aae65a1a972d9ceb4377/sdks/go/pkg/beam/core/runtime/harness/statemgr.go#L50]
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