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Rework java update-by-query docs

This commit is contained in:
Nik Everett 2016-06-24 11:12:39 -04:00
parent 83d7f199c7
commit ccab85835a
1 changed files with 85 additions and 379 deletions
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docs/java-api/docs/update-by-query.asciidoc
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@ -12,38 +12,11 @@ mapping change.
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
updateByQuery.source("cool_things")
.filter(termQuery("level", "awesome"))
.script(new Script("ctx._source.awesome = \"absolutely\""));
updateByQuery.source("source_index").abortOnVersionConflict(false);
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
The `updatebyQuery` API returns a JSON object similar to the following example:
[source,java]
--------------------------------------------------
{
"took" : 147,
"timed_out": false,
"updated": 120,
"deleted": 0,
"batches": 1,
"version_conflicts": 0,
"noops": 0,
"retries": {
"bulk": 0,
"search": 0
},
"throttled_millis": 0,
"requests_per_second": "unlimited",
"throttled_until_millis": 0,
"total": 120,
"failures" : [ ]
}
--------------------------------------------------
// TESTRESPONSE[s/"took" : 147/"took" : "$body.took"/]
Calls to the `updateByQuery` API start by getting a snapshot of the index, indexing
any documents found using the `internal` versioning.
@ -54,79 +27,78 @@ When the versions match, `updateByQuery` updates the document
and increments the version number.
All update and query failures cause `updateByQuery` to abort. These failures are
listed in the `failures` section of the JSON response object. Any successful updates
remain and are not rolled back. While the first failure causes the abort, the JSON
response object contains all of the failures generated by the failed bulk request.
available from the `BulkIndexByScrollResponse#getIndexingFailures` method. Any
successful updates remain and are not rolled back. While the first failure
causes the abort, the response contains all of the failures generated by the
failed bulk request.
To prevent version conflicts from causing `updateByQuery` to abort,
set `conflicts=proceed` on the URL or `"conflicts": "proceed"`
in the request body. The first example does this because it is trying to
pick up an online mapping change and a version conflict means that the
conflicting document was updated between the start of the `updateByQuery`
To prevent version conflicts from causing `updateByQuery` to abort, set
`abortOnVersionConflict(false)`. The first example does this because it is
trying to pick up an online mapping change and a version conflict means that
the conflicting document was updated between the start of the `updateByQuery`
and the time when it attempted to update the document. This is fine because
that update will have picked up the online mapping update.
Back to the API format, you can limit `updateByQuery` to a single type. This
will only update `tweet` documents from the `twitter` index:
// provide API Example
Back to the API, `UpdateByQueryRequestBuilder` supports filtering the documents
that are updated, limiting the total number updated, and updating documents
with a script:
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
updateByQuery.source("source_index")
.filter(termQuery("level", "awesome"))
.size(1000)
.script(new Script("ctx._source.awesome = 'absolutely'", ScriptType.INLINE, "painless", emptyMap()));
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
You can also limit `updateByQuery` using the
<<query-dsl,Query DSL>>. This example updates all documents from the
`twitter` index for the user `kimchy`:
// provide API Example
`UpdateByQueryRequestBuilder` also allows you direct access to the query used
to select the documents which you can use to change the default scroll size or
otherwise modify the request for matching documents.
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
{
"query": { <1>
"term": {
"user": "kimchy"
}
}
}
updateByQuery.source("source_index")
.source().setSize(500);
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
<1> The query must be passed as a value to the `query` key, in the same
way as the <<search-search,Search API>>. You can also use the `q`
parameter in the same way as the search api.
So far we've only been updating documents without changing their source. That
is genuinely useful for things like
<<picking-up-a-new-property,picking up new properties>> but it's only half the
fun. `updateByQuery` supports a `script` object to update the document. This
will increment the `likes` field on all of kimchy's tweets:
// provide API Example
You can also combine `size` with sorting to limit the documents updated:
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
{
"script": {
"inline": "ctx._source.likes++"
},
"query": {
"term": {
"user": "kimchy"
}
}
}
updateByQuery.source("source_index").size(100)
.source().addSort("cat", SortOrder.DESC);
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
In addition to changing the `_source` of the document (see above) the script
can change the update action similarly to the Update API:
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
updateByQuery.source("source_index")
.script(new Script(
"if (ctx._source.awesome == 'absolutely) {"
+ " ctx.op='noop'
+ "} else if (ctx._source.awesome == 'lame') {"
+ " ctx.op='delete'"
+ "} else {"
+ "ctx._source.awesome = 'absolutely'}", ScriptType.INLINE, "painless", emptyMap()));
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
Just as in <<docs-update,Update API>> you can set `ctx.op` to change the
operation that is executed:
@ -141,15 +113,12 @@ changes. That will cause `updateByQuery` to omit that document from its updates.
`delete`::
Set `ctx.op = "delete"` if your script decides that the document must be
deleted. The deletion will be reported in the `deleted` counter in the
deleted. The deletion will be reported in the `deleted` counter in the
<<docs-update-by-query-response-body, response body>>.
Setting `ctx.op` to anything else is an error. Setting any
other field in `ctx` is an error.
Note that we stopped specifying `conflicts=proceed`. In this case we want a
version conflict to abort the process so we can handle the failure.
This API doesn't allow you to move the documents it touches, just modify their
source. This is intentional! We've made no provisions for removing the document
from its original location.
@ -157,144 +126,38 @@ from its original location.
It's also possible to do this whole thing on multiple indexes and multiple
types at once, just like the search API:
// provide API Example
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
updateByQuery.source("foo", "bar").source().setTypes("a", "b");
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[s/^/PUT twitter\nPUT blog\nGET _cluster\/health?wait_for_status=yellow\n/]
If you provide `routing` then the routing is copied to the scroll query,
limiting the process to the shards that match that routing value:
// provide API Example
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
updateByQuery.source().setRouting("cat");
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
By default `updateByQuery` uses scroll batches of 1000. You can change the
batch size with the `scroll_size` URL parameter:
// provide API Example
[source,java]
--------------------------------------------------
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
`updateByQuery` can also use the <<ingest>> feature by
specifying a `pipeline` like this:
// provide API Example
[source,java]
--------------------------------------------------
UpdateByQueryRequestBuilder updateByQuery = UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
{
"description" : "sets foo",
"processors" : [ {
"set" : {
"field": "foo",
"value": "bar"
}
} ]
}
POST twitter/_update_by_query?pipeline=set-foo
updateByQuery.setPipeline("hurray");
BulkIndexByScrollResponse response = updateByQuery.get();
--------------------------------------------------
// CONSOLE
// TEST[setup:twitter]
[float]
=== URL Parameters
In addition to the standard parameters like `pretty`, the Update By Query API
also supports `refresh`, `wait_for_completion`, `consistency`, and `timeout`.
Sending the `refresh` will update all shards in the index being updated when
the request completes. This is different than the Index API's `refresh`
parameter which causes just the shard that received the new data to be indexed.
If the request contains `wait_for_completion=false` then Elasticsearch will
perform some preflight checks, launch the request, and then return a `task`
which can be used with <<docs-update-by-query-task-api,Tasks APIs>>
to cancel or get the status of the task. Elasticsearch will also create a
record of this task as a document at `.tasks/task/${taskId}`. This is yours
to keep or remove as you see fit. When you are done with it, delete it so
Elasticsearch can reclaim the space it uses.
`consistency` controls how many copies of a shard must respond to each write
request. `timeout` controls how long each write request waits for unavailable
shards to become available. Both work exactly how they work in the
<<docs-bulk,Bulk API>>.
`requests_per_second` can be set to any decimal number (`1.4`, `6`, `1000`, etc)
and throttles the number of requests per second that the update by query issues.
The throttling is done waiting between bulk batches so that it can manipulate
the scroll timeout. The wait time is the difference between the time it took the
batch to complete and the time `requests_per_second * requests_in_the_batch`.
Since the batch isn't broken into multiple bulk requests large batch sizes will
cause Elasticsearch to create many requests and then wait for a while before
starting the next set. This is "bursty" instead of "smooth". The default is
`unlimited` which is also the only non-number value that it accepts.
[float]
[[docs-update-by-query-response-body]]
=== Response body
The JSON response looks like this:
[source,java]
--------------------------------------------------
{
"took" : 639,
"updated": 0,
"batches": 1,
"version_conflicts": 2,
"retries": {
"bulk": 0,
"search": 0
}
"throttled_millis": 0,
"failures" : [ ]
}
--------------------------------------------------
`took`::
The number of milliseconds from start to end of the whole operation.
`updated`::
The number of documents that were successfully updated.
`batches`::
The number of scroll responses pulled back by the the update by query.
`version_conflicts`::
The number of version conflicts that the update by query hit.
`retries`::
The number of retries attempted by update-by-query. `bulk` is the number of bulk
actions retried and `search` is the number of search actions retried.
`throttled_millis`::
Number of milliseconds the request slept to conform to `requests_per_second`.
`failures`::
Array of all indexing failures. If this is non-empty then the request aborted
because of those failures. See `conflicts` for how to prevent version conflicts
from aborting the operation.
[float]
[[docs-update-by-query-task-api]]
@ -303,79 +166,26 @@ from aborting the operation.
You can fetch the status of all running update-by-query requests with the
<<tasks,Task API>>:
// provide API Example
[source,java]
--------------------------------------------------
ListTasksResponse tasksList = client.admin().cluster().prepareListTasks()
.setActions(UpdateByQueryAction.NAME).setDetailed(true).get();
--------------------------------------------------
// CONSOLE
The responses looks like:
[source,java]
--------------------------------------------------
{
"nodes" : {
"r1A2WoRbTwKZ516z6NEs5A" : {
"name" : "Tyrannus",
"transport_address" : "127.0.0.1:9300",
"host" : "127.0.0.1",
"ip" : "127.0.0.1:9300",
"attributes" : {
"testattr" : "test",
"portsfile" : "true"
},
"tasks" : {
"r1A2WoRbTwKZ516z6NEs5A:36619" : {
"node" : "r1A2WoRbTwKZ516z6NEs5A",
"id" : 36619,
"type" : "transport",
"action" : "indices:data/write/update/byquery",
"status" : { <1>
"total" : 6154,
"updated" : 3500,
"created" : 0,
"deleted" : 0,
"batches" : 4,
"version_conflicts" : 0,
"noops" : 0,
"retries": {
"bulk": 0,
"search": 0
}
"throttled_millis": 0
},
"description" : ""
}
}
}
}
for (TaskInfo info: tasksList.getTasks()) {
TaskId taskId = info.getTaskId();
BulkByScrollTask.Status status = (BulkByScrollTask.Status) info.getStatus();
// do stuff
}
--------------------------------------------------
<1> this object contains the actual status. It is just like the response json
with the important addition of the `total` field. `total` is the total number
of operations that the reindex expects to perform. You can estimate the
progress by adding the `updated`, `created`, and `deleted` fields. The request
will finish when their sum is equal to the `total` field.
With the task id you can look up the task directly:
With the `TaskId` shown above you can look up the task directly:
// provide API Example
[source,java]
--------------------------------------------------
GetTaskResponse get = client.admin().cluster().prepareGetTask(taskId).get();
--------------------------------------------------
// CONSOLE
// TEST[catch:missing]
The advantage of this API is that it integrates with `wait_for_completion=false`
to transparently return the status of completed tasks. If the task is completed
and `wait_for_completion=false` was set on it them it'll come back with a
`results` or an `error` field. The cost of this feature is the document that
`wait_for_completion=false` creates at `.tasks/task/${taskId}`. It is up to
you to delete that document.
[float]
[[docs-update-by-query-cancel-task-api]]
@ -383,14 +193,15 @@ you to delete that document.
Any Update By Query can be canceled using the <<tasks,Task Cancel API>>:
// provide API Example
[source,java]
--------------------------------------------------
// Cancel all update-by-query requests
client.admin().cluster().prepareCancelTasks().setActions(UpdateByQueryAction.NAME).get().getTasks()
// Cancel a specific update-by-query request
client.admin().cluster().prepareCancelTasks().setTaskId(taskId).get().getTasks()
--------------------------------------------------
// CONSOLE
The `task_id` can be found using the tasks API above.
The `taskId` can be found using the list tasks API above.
Cancelation should happen quickly but might take a few seconds. The task status
API above will continue to list the task until it is wakes to cancel itself.
@ -403,120 +214,15 @@ API above will continue to list the task until it is wakes to cancel itself.
The value of `requests_per_second` can be changed on a running update by query
using the `_rethrottle` API:
// provide API Example
[source,java]
--------------------------------------------------
RethrottleAction.INSTANCE.newRequestBuilder(client).setTaskId(taskId).setRequestsPerSecond(2.0f).get();
--------------------------------------------------
// CONSOLE
The `task_id` can be found using the tasks API above.
The `taskId` can be found using the tasks API above.
Just like when setting it on the `updateByQuery` API `requests_per_second`
can be either `unlimited` to disable throttling or any decimal number like `1.7`
or `12` to throttle to that level. Rethrottling that speeds up the query takes
can be either `Float.POSITIVE_INFINITY` to disable throttling or any positive
float to throttle to that level. Rethrottling that speeds up the query takes
effect immediately but rethrotting that slows down the query will take effect
on after completing the current batch. This prevents scroll timeouts.
[float]
[[picking-up-a-new-property]]
=== Pick up a new property
Say you created an index without dynamic mapping, filled it with data, and then
added a mapping value to pick up more fields from the data:
[source,java]
--------------------------------------------------
PUT test
{
"mappings": {
"test": {
"dynamic": false, <1>
"properties": {
"text": {"type": "text"}
}
}
}
}
POST test/test?refresh
{
"text": "words words",
"flag": "bar"
}
POST test/test?refresh
{
"text": "words words",
"flag": "foo"
}
PUT test/_mapping/test <2>
{
"properties": {
"text": {"type": "text"},
"flag": {"type": "text", "analyzer": "keyword"}
}
}
--------------------------------------------------
// CONSOLE
<1> This means that new fields won't be indexed, just stored in `_source`.
<2> This updates the mapping to add the new `flag` field. To pick up the new
field you have to reindex all documents with it.
Searching for the data won't find anything:
// provide API Example
[source,java]
--------------------------------------------------
{
"query": {
"match": {
"flag": "foo"
}
}
}
--------------------------------------------------
// CONSOLE
// TEST[continued]
[source,java]
--------------------------------------------------
{
"hits" : {
"total" : 0
}
}
--------------------------------------------------
// TESTRESPONSE
But you can issue an `updateByQuery` request to pick up the new mapping:
// provide API Example
[source,java]
--------------------------------------------------
{
"query": {
"match": {
"flag": "foo"
}
}
}
--------------------------------------------------
// CONSOLE
// TEST[continued]
[source,java]
--------------------------------------------------
{
"hits" : {
"total" : 1
}
}
--------------------------------------------------
// TESTRESPONSE
You can do the exact same thing when adding a field to a multifield.