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Processing - Document Processors","content":"A document processor is a component extending `com.yahoo.docproc.DocumentProcessor`.\n All document processors must implement `process()`:\n```\npublic Progress process(Processing processing);\n```\n When the container receives a document operation,\n it will create a new `Processing`, and add the `DocumentPut`s,\n `DocumentUpdate`s or `DocumentRemove`s to the `List`\n accessible through `Processing.getDocumentOperations()`.\n The latter is useful also where a processing should be stopped\n by doing `Processing.getDocumentOperations().clear()` before `Progress.DONE`,\n say for blocklist use, to stop a `DocumentPut/Update`.\n\n Furthermore, the call stack of the document processing chain in question will\n be *copied* to `Processing.callStack()`,\n so that document processors may freely modify the flow of control for this processing\n without affecting all other processings going on.\n After creation, the `Processing` is added to an internal queue.\n\n A worker thread will retrieve a `Processing` from the input queue,\n and run its document operations through its call stack.\n A minimal, no-op document processor implementation is thus:\n```java\n\n\nimport com.yahoo.docproc.*;\n\npublic class SimpleDocumentProcessor extends DocumentProcessor {\n public Progress process(Processing processing) {\n return Progress.DONE;\n }\n}\n\n```\n The `process()` method should loop through all\n document operations in `Processing.getDocumentOperations()`, do\n whatever it sees fit to them, and return a Progress:\n```java\n\n\npublic Progress process(Processing processing) {\n for (DocumentOperation op : processing.getDocumentOperations()) {\n if (op instanceof DocumentPut) {\n DocumentPut put = (DocumentPut) op;\n // TODO do something to 'put here\n } else if (op instanceof DocumentUpdate) {\n DocumentUpdate update = (DocumentUpdate) op;\n // TODO do something to 'update' here\n } else if (op instanceof DocumentRemove) {\n DocumentRemove remove = (DocumentRemove) op;\n // TODO do something to 'remove' here\n }\n }\n return Progress.DONE;\n}\n\n```\n| Return code | Description |\n| --- | --- |\n| `Progress.DONE` | Returned if a document processor has successfully processed a `Processing`. |\n| `Progress.FAILED` | Processing failed and the input message should return a *fatal* failure back to the feeding application, meaning that this application will not try to re-feed this document operation. Return an error message/reason by calling `withReason()`: \n```java\n if (op instanceof DocumentPut) { return Progress.FAILED.withReason(\"PUT is not supported\"); } \n```\n |\n| `Progress.LATER` | See [execution model](#execution-model). The document processor wants to release the calling thread and be called again later. This is useful if e.g. calling an external service with high latency. The document processor may then save its state in the `Processing` and resume when called again later. There are no guarantees as to *when* the processor is called again with this `Processing`; it is simply appended to the back of the input queue. By the use of `Progress.LATER`, this is an asynchronous model, where the processing of a document operation does not need to consume one thread for its entire lifespan. Note, however, that the document processors themselves are shared between all processing operations in a chain, and must thus be implemented [thread-safe](#state). |\n\n| Exception | Description |\n| --- | --- |\n| `com.yahoo.docproc.TransientFailureException` | Processing failed and the input message should return a *transient* failure back to the feeding application, meaning that this application *may* try to re-feed this document operation. |\n| `RuntimeException` | Throwing any other `RuntimeException` means same behavior as for `Progress.FAILED`. |","questions":["What is a document processor?","What is com.yahoo.docproc.DocumentProcessor?","What is the process() method used for?","What is Progress?","What is Progress.DONE used for?","What is Progress.LATER used 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API - Documents","content":"All data fed, indexed and searched in Vespa are instances of the `Document` class.\nA [document](documents.html) is a composite object that consists of:\n\n* A `DocumentType` that defines the set of fields that\n can exist in a document. A document can only have a single\n *document type*, but document types can inherit the content of another.\n All fields of an inherited type is available in all its descendants.\n The document type is defined in the\n [schema](reference/schema-reference.html),\n which is converted into a configuration file to be read by the\n `DocumentManager`.\n \n\n All registered document types are instantiated and stored within\n the document manager. A reference to these objects can be\n retrieved using the `getDocumentType()` method by\n supplying the name and the version of the wanted document type.\n \n\n`DocumentManager` initialization is done automatically\n by the Document API by subscribing to the appropriate\n configuration.\n* A `DocumentId` which is a unique document identifier.\n The document distribution uses the document identifier,\n see the [reference](content/buckets.html#distribution) for details.\n* A set of `(Field, FieldValue)` pairs, or\n \"fields\" for short. The `Field` class has\n methods for getting its name, data type and internal\n identifier. The field object for a given field name can be\n retrieved using the `getField()`\n method in the `DocumentType`.\n\nUse [DocumentAccess](https://javadoc.io/doc/com.yahoo.vespa/documentapi/latest/com/yahoo/documentapi/DocumentAccess.html) javadoc. Sample app:\n```\n\n \n com.yahoo.vespa\n documentapi\n {{site.variables.vespa_version}} \n \n\n```\n```\nimport com.yahoo.document.DataType;\nimport com.yahoo.document.Document;\nimport com.yahoo.document.DocumentId;\nimport com.yahoo.document.DocumentPut;\nimport com.yahoo.document.DocumentType;\nimport com.yahoo.document.DocumentUpdate;\nimport com.yahoo.document.datatypes.StringFieldValue;\nimport com.yahoo.document.datatypes.WeightedSet;\nimport com.yahoo.document.update.FieldUpdate;\nimport com.yahoo.documentapi.DocumentAccess;\nimport com.yahoo.documentapi.SyncParameters;\nimport com.yahoo.documentapi.SyncSession;\n\npublic class DocClient {\n\n public static void main(String[] args) {\n\n // DocumentAccess is injectable in Vespa containers, but not in command line tools, etc.\n DocumentAccess access = DocumentAccess.createForNonContainer();\n DocumentType type = access.getDocumentTypeManager().getDocumentType(\"music\");\n DocumentId id = new DocumentId(\"id:namespace:music::0\");\n Document docIn = new Document(type, id);\n SyncSession session = access.createSyncSession(new SyncParameters.Builder().build());\n\n // Put document with a1,1\n WeightedSet wset = new WeightedSet<>(DataType.getWeightedSet(DataType.STRING));\n wset.put(new StringFieldValue(\"a1\"), 1);\n docIn.setFieldValue(\"aWeightedset\", wset);\n DocumentPut put = new DocumentPut(docIn);\n System.out.println(docIn.toJson());\n session.put(put);\n\n // Update document with a1,10 and a2,20\n DocumentUpdate upd1 = new DocumentUpdate(type, id);\n WeightedSet wset1 = new WeightedSet<>(DataType.getWeightedSet(DataType.STRING));\n wset1.put(new StringFieldValue(\"a1\"), 10);\n wset1.put(new StringFieldValue(\"a2\"), 20);\n upd1.addFieldUpdate(FieldUpdate.createAddAll(type.getField(\"aWeightedset\"), wset1));\n System.out.println(upd1.toString());\n session.update(upd1);\n\n Document docOut = session.get(id);\n System.out.println(\"document get:\" + docOut.toJson());\n\n session.destroy();\n access.shutdown();\n }\n}\n```\nTo test using the [sample apps](https://github.com/vespa-engine/sample-apps/tree/master/album-recommendation),\nenable more ports for client to connect to config server and other processes on localhost - change docker command:\n```\n$ docker run --detach --name vespa --hostname localhost --privileged \\\n --volume $VESPA_SAMPLE_APPS:/vespa-sample-apps --publish 8080:8080 \\\n --publish 19070:19070 --publish 19071:19071 --publish 19090:19090 --publish 19099:19099 --publish 19101:19101 --publish 19112:19112 \\\n vespaengine/vespa\n```\n","questions":["What consists of a Document?","What is a DocumentType?","What is a DocumentId?","What is a FieldUpdate?","What is DocumentAccess?","What is 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API - Document updates","content":"A document update is a request to modify a document, see [reads and writes](reads-and-writes.html).\n\nPrimitive, and some multivalue fields (WeightedSet and Array), are updated using a\n[FieldUpdate](https://javadoc.io/doc/com.yahoo.vespa/document/latest/com/yahoo/document/update/FieldUpdate.html).\n\nComplex, multivalue fields like Map and Array are updated using\n[AddFieldPathUpdate](https://javadoc.io/doc/com.yahoo.vespa/document/latest/com/yahoo/document/fieldpathupdate/AddFieldPathUpdate.html),\n[AssignFieldPathUpdate](https://javadoc.io/doc/com.yahoo.vespa/document/latest/com/yahoo/document/fieldpathupdate/AssignFieldPathUpdate.html) and\n[RemoveFieldPathUpdate](https://javadoc.io/doc/com.yahoo.vespa/document/latest/com/yahoo/document/fieldpathupdate/RemoveFieldPathUpdate.html).\n\nField path updates are only supported on non-attribute\n[fields](reference/schema-reference.html#field),\n[index](reference/schema-reference.html#index) fields,\nor fields containing\n[struct field](reference/schema-reference.html#struct-field) attributes.\nIf a field is both an index field and an attribute, then the document is updated in the document store,\nthe index is updated, but the attribute is not updated.\nThus, you can get old values in document summary requests and old values being used in ranking and grouping.\nA [field path](reference/document-field-path.html) string identifies fields to update - example:\n```\nupd.addFieldPathUpdate(new AssignFieldPathUpdate(type, \"myMap{key2}\", new StringFieldValue(\"abc\")));\n```\n*FieldUpdate* examples:\n\n \n```\n// Simple assignment\nField intField = type.getField(\"aInt\");\nIntegerFieldValue intFieldValue = new IntegerFieldValue(2);\nFieldUpdate assignUpdate = FieldUpdate.createAssign(intField, intFieldValue);\nupd.addFieldUpdate(assignUpdate);\n\n// Arithmetic\nFieldUpdate addUpdate = FieldUpdate.createIncrement(type.getField(\"aLong\"), 3);\nupd.addFieldUpdate(addUpdate);\n\n// Composite - add one array element\nupd.addFieldUpdate(FieldUpdate.createAdd(type.getField(\"aArray\"),\n new IntegerFieldValue(13)));\n\n// Composite - add two array elements\nupd.addFieldUpdate(FieldUpdate.createAddAll(type.getField(\"aArray\"),\n List.of(new IntegerFieldValue(14), new IntegerFieldValue(15))));\n\n// Composite - add weightedset element\nupd.addFieldUpdate(FieldUpdate.createAdd(type.getField(\"aWeightedset\"),\n new StringFieldValue(\"add_me\"),101));\n\n// Composite - add set to set\nWeightedSet wset = new WeightedSet<>(DataType.getWeightedSet(DataType.STRING));\nwset.put(new StringFieldValue(\"a1\"), 3);\nwset.put(new StringFieldValue(\"a2\"), 4);\nupd.addFieldUpdate(FieldUpdate.createAddAll(type.getField(\"aWeightedset\"), wset));\n\n// Composite - update array element\nupd.addFieldUpdate(FieldUpdate.createMap(type.getField(\"aArray\"),\n new IntegerFieldValue(1), // array index\n new AssignValueUpdate(new IntegerFieldValue(2)))); // value at index\n\n// Composite - increment weight\nupd3.addFieldUpdate(FieldUpdate.createIncrement(type.getField(\"aWeightedset\"),\n new StringFieldValue(\"a1\"), 1));\n\n// Composite - add to set\nupd.addFieldUpdate(FieldUpdate.createMap(type.getField(\"aWeightedset\"),\n new StringFieldValue(\"element1\"), // value\n new AssignValueUpdate(new IntegerFieldValue(30))));\n```\n*FieldPathUpdate* examples:\n\n \n```\n// Add an element to a map\nArray stringArray = new Array(DataType.getArray(DataType.STRING));\nstringArray.add(new StringFieldValue(\"my-val\"));\nAddFieldPathUpdate addElement = new AddFieldPathUpdate(type, \"aMap{key1}\", stringArray);\nupd.addFieldPathUpdate(addElement);\n\n// Modify an element in a map\nupd.addFieldPathUpdate(new AssignFieldPathUpdate(type, \"aMap{key2}\", new StringFieldValue(\"abc\")));\n```\n","questions":["What is a document update?","How are primitive fields updated?","How are complex fields updated?","What field types support field path updates?","What are some examples of 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Processing - Deploying a Document Processor","content":"Refer to[album-recommendation-docproc](https://github.com/vespa-engine/sample-apps/tree/master/examples/document-processing) to get started,\n [LyricsDocumentProcessor.java](https://github.com/vespa-engine/sample-apps/blob/master/examples/document-processing/src/main/java/ai/vespa/example/album/LyricsDocumentProcessor.java) is a document processor example.\n Add the document processor in [services.xml](reference/services-docproc.html),\n and then add it to a [chain](#chains).\n The type of processing done by the processor dictates what chain it should be part of:\n\n* If it does general data-processing, such as populating some document fields from others,\n looking up data in external services, etc., it should be added to a general docproc chain.\n* If, and only if, it does processing required for *indexing*,\n or requires this to have already been run — e.g.,\n for processing the [annotations](annotations.html) created by the 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- Document expiry","content":"To auto-expire documents, use a [selection](reference/services-content.html#documents.selection) with [now](reference/indexing-language-reference.html#now).\n Example, keep *music*-documents for a day, using a field called *timestamp*:\n```xml\n\n\n \n\n\n```\nThe *timestamp*-field must have values in seconds since EPOCH:\n```\nfield timestamp type long {\n indexing: attribute\n attribute {\n fast-access\n }\n}\n```\n When `garbage-collection=\"true\"`, Vespa iterates over the document space to purge expired documents.\n Vespa will invoke the configured GC selection for each stored document at most once every\n [garbage-collection-interval](reference/services-content.html#documents.selection) seconds.\n\n \n* Using a *selection* with *now* can have side effects\n when re-feeding or re-processing documents, as timestamps can be stale.\n A common problem is feeding with too old timestamps,\n resulting in no documents being indexed.\n* Normally, documents that are already expired at write time are not persisted.\n When using [create](document-v1-api-guide.html#create-if-nonexistent)\n (Create if nonexistent), it is possible to create documents that are expired and will be removed in next cycle.\n* Deploying a configuration where the selection string selects no documents\n will cause all documents to be garbage collected.\n Use [visit](visiting.html) to test the selection string.\n Garbage collected documents are not to be expected to be recoverable.\n* The fields that are referenced in the selection expression should be attributes.\n Also, either the fields should be set with *\"fast-access\"* or the number of\n [searchable copies](reference/services-content.html#searchable-copies) in the content cluster should be the same as\n the [redundancy](reference/services-content.html#redundancy).\n Otherwise, the document selection maintenance will be slow\n and have a major performance impact on the system.\n* [Imported fields](reference/schema-reference.html#import-field)\n can be used in the selection string to expire documents, but special care needs to be\n taken when using these.\n See [using imported fields in selections](reference/document-select-language.html#using-imported-fields-in-selections) for more information and restrictions.\n* Document garbage collection is a low priority background operation that runs continuously\n unless preempted by higher priority operations.\n If the cluster is too heavily loaded by client feed operations, there's a risk of starving\n GC from running. To verify that garbage collection is not starved, check the\n [vds.idealstate.max_observed_time_since_last_gc_sec.average](operations/metrics.html)\n distributor metric.\n If it significantly exceeds `garbage-collection-interval` it is an indication that GC is starved.\n\n To batch remove, set a selection that matches no documents, like *\"not music\"*\n\n Use [vespa visit](visiting.html) to test the selection.\n Dump the IDs of all documents that would be *preserved*:\n```sh\n\n$ vespa visit --selection 'music.timestamp > now() - 86400' --field-set \"music.timestamp\"\n\n```\n Negate the expression by wrapping it in a `not`\n to dump the IDs of all the documents that would be *removed* during GC:\n```sh\n\n$ vespa visit --selection 'not (music.timestamp > now() - 86400)' --field-set \"music.timestamp\"\n\n```\n","questions":["How to auto-expire documents?","How does Vespa iterate over the document space?","How to use a selection with now?","What are the side effects of using a 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