225 lines
5.8 KiB
Plaintext
225 lines
5.8 KiB
Plaintext
[[indices-rollover-index]]
|
|
== Rollover Index
|
|
|
|
The rollover index API rolls an alias over to a new index when the existing
|
|
index is considered to be too large or too old.
|
|
|
|
The API accepts a single alias name and a list of `conditions`. The alias
|
|
must point to a single index only. If the index satisfies the specified
|
|
conditions then a new index is created and the alias is switched to point to
|
|
the new alias.
|
|
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
PUT /logs-000001 <1>
|
|
{
|
|
"aliases": {
|
|
"logs_write": {}
|
|
}
|
|
}
|
|
|
|
# Add > 1000 documents to logs-000001
|
|
|
|
POST /logs_write/_rollover <2>
|
|
{
|
|
"conditions": {
|
|
"max_age": "7d",
|
|
"max_docs": 1000
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[setup:huge_twitter]
|
|
// TEST[s/# Add > 1000 documents to logs-000001/POST _reindex?refresh\n{"source":{"index":"twitter"},"dest":{"index":"logs-000001"}}/]
|
|
<1> Creates an index called `logs-0000001` with the alias `logs_write`.
|
|
<2> If the index pointed to by `logs_write` was created 7 or more days ago, or
|
|
contains 1,000 or more documents, then the `logs-000002` index is created
|
|
and the `logs_write` alias is updated to point to `logs-000002`.
|
|
|
|
The above request might return the following response:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
{
|
|
"acknowledged": true,
|
|
"shards_acknowledged": true,
|
|
"old_index": "logs-000001",
|
|
"new_index": "logs-000002",
|
|
"rolled_over": true, <1>
|
|
"dry_run": false, <2>
|
|
"conditions": { <3>
|
|
"[max_age: 7d]": false,
|
|
"[max_docs: 1000]": true
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TESTRESPONSE
|
|
<1> Whether the index was rolled over.
|
|
<2> Whether the rollover was dry run.
|
|
<3> The result of each condition.
|
|
|
|
[float]
|
|
=== Naming the new index
|
|
|
|
If the name of the existing index ends with `-` and a number -- e.g.
|
|
`logs-000001` -- then the name of the new index will follow the same pattern,
|
|
incrementing the number (`logs-000002`). The number is zero-padded with a length
|
|
of 6, regardless of the old index name.
|
|
|
|
If the old name doesn't match this pattern then you must specify the name for
|
|
the new index as follows:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
POST /my_alias/_rollover/my_new_index_name
|
|
{
|
|
"conditions": {
|
|
"max_age": "7d",
|
|
"max_docs": 1000
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[s/^/PUT my_old_index_name\nPUT my_old_index_name\/_alias\/my_alias\n/]
|
|
|
|
[float]
|
|
=== Using date math with the rolllover API
|
|
|
|
It can be useful to use <<date-math-index-names,date math>> to name the
|
|
rollover index according to the date that the index rolled over, e.g.
|
|
`logstash-2016.02.03`. The rollover API supports date math, but requires the
|
|
index name to end with a dash followed by a number, e.g.
|
|
`logstash-2016.02.03-1` which is incremented every time the index is rolled
|
|
over. For instance:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
PUT /<logs-{now/d}-1> <1>
|
|
{
|
|
"aliases": {
|
|
"logs_write": {}
|
|
}
|
|
}
|
|
|
|
PUT logs_write/log/1
|
|
{
|
|
"message": "a dummy log"
|
|
}
|
|
|
|
# Wait for a day to pass
|
|
|
|
POST /logs_write/_rollover <2>
|
|
{
|
|
"conditions": {
|
|
"max_docs": "1"
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[s/\{now\//{2016.10.31||%2f/]
|
|
<1> Creates an index named with today's date (e.g.) `logs-2016.10.31-1`
|
|
<2> Rolls over to a new index with today's date, e.g. `logs-2016.10.31-000002` if run immediately, or `logs-2016.11.01-000002` if run after 24 hours
|
|
|
|
//////////////////////////
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
GET _alias
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[continued]
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
{
|
|
"logs-2016.10.31-000002": {
|
|
"aliases": {
|
|
"logs_write": {}
|
|
}
|
|
},
|
|
"logs-2016.10.31-1": {
|
|
"aliases": {}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TESTRESPONSE
|
|
|
|
//////////////////////////
|
|
|
|
These indices can then be referenced as described in the
|
|
<<date-math-index-names,date math documentation>>. For example, to search
|
|
over indices created in the last three days, you could do the following:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
GET /<logs-{now/d}-*>,<logs-{now/d-1d}-*>,<logs-{now/d-2d}-*>/_search
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[continued]
|
|
// TEST[s/now\//now%2f/]
|
|
|
|
[float]
|
|
=== Defining the new index
|
|
|
|
The settings, mappings, and aliases for the new index are taken from any
|
|
matching <<indices-templates,index templates>>. Additionally, you can specify
|
|
`settings`, `mappings`, and `aliases` in the body of the request, just like the
|
|
<<indices-create-index,create index>> API. Values specified in the request
|
|
override any values set in matching index templates. For example, the following
|
|
`rollover` request overrides the `index.number_of_shards` setting:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
PUT /logs-000001
|
|
{
|
|
"aliases": {
|
|
"logs_write": {}
|
|
}
|
|
}
|
|
|
|
POST /logs_write/_rollover
|
|
{
|
|
"conditions" : {
|
|
"max_age": "7d",
|
|
"max_docs": 1000
|
|
},
|
|
"settings": {
|
|
"index.number_of_shards": 2
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
|
|
[float]
|
|
=== Dry run
|
|
|
|
The rollover API supports `dry_run` mode, where request conditions can be
|
|
checked without performing the actual rollover:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
PUT /logs-000001
|
|
{
|
|
"aliases": {
|
|
"logs_write": {}
|
|
}
|
|
}
|
|
|
|
POST /logs_write/_rollover?dry_run
|
|
{
|
|
"conditions" : {
|
|
"max_age": "7d",
|
|
"max_docs": 1000
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
|
|
[float]
|
|
=== Wait For Active Shards
|
|
|
|
Because the rollover operation creates a new index to rollover to, the
|
|
<<create-index-wait-for-active-shards,`wait_for_active_shards`>> setting on
|
|
index creation applies to the rollover action as well.
|