elasticdump

Tools for moving and saving indicies.

Installing

(local)

npm install elasticdump
./bin/elasticdump

(global)

npm install elasticdump -g
elasticdump

Use

elasticdump works by sending an input to an output. Both can be either an elasticsearch URL or a File.

Elasticsearch:

• format: {protocol}://{host}:{port}/{index}
• example: http://127.0.0.1:9200/my_index

File:

• format: {FilePath}
• example: /Users/evantahler/Desktop/dump.json

Stdio:

• format: stdin / stdout
• format: $

You can then do things like:

# Copy an index from production to staging with mappings:
elasticdump --input=http://production.es.com:9200/my_index --output=http://staging.es.com:9200/my_index --type=mapping
elasticdump --input=http://production.es.com:9200/my_index --output=http://staging.es.com:9200/my_index --type=data

# Backup index data to a file:
elasticdump --input=http://production.es.com:9200/my_index --output=/data/my_index_mapping.json --type=mapping
elasticdump --input=http://production.es.com:9200/my_index --output=/data/my_index.json --type=data

# Backup and index to a gzip using stdout:
elasticdump --input=http://production.es.com:9200/my_index --output=$ | gzip > /data/my_index.json.gz

# Backup ALL indices, then use Bulk API to populate another ES cluster:
elasticdump --all=true --input=http://production-a.es.com:9200/ --output=/data/production.json
elasticdump --bulk=true --input=/data/production.json --output=http://production-b.es.com:9200/

# Backup the results of a query to a file
elasticdump --input=http://production.es.com:9200/my_index --output=query.json --searchBody '{"query":{"term":{"username": "admin"}}}'

Options

• --input (required) (see above)
• --output (required) (see above)
• --limit how many ojbects to move in bulk per operation (default: 100)
• --debug display the elasticsearch commands being used (default: false)
• --type what are we exporting? (default: data, options: [data, mapping])
• --delete delete documents one-by-one from the input as they are moved (will not delete the source index) (default: false)
• --searchBody preform a partial extract based on search results (when ES is the input, default: '{"query": { "match_all": {} } }')
• --all load/store documents from ALL indices (default: false)
• --bulk leverage elasticsearch Bulk API when writing documents (default: false)
• --ignore-errors will continue the read/write loop on write error (default: false)
• --scrollTime Time the nodes will hold the requested search in order. (default: 10m)
• --maxSockets How many simultanius HTTP requests can this process make? (default: 5 [node <= v0.10.x] / Infinity [node >= v0.11.x] )
• --bulk-use-output-index-name Force use of destination index name (actually the actual output URL) as destination while bulk writing to ES. Allows leveraging Bulk API copying data inside the same elasticsearch instance. (default: false)

Elasticsearch's scan and scroll method

Elasticsearch provides a scan and scroll method to fetch all documents of an index. This method is much safer to use since it will maintain the result set in cache for the given period of time. This means it will be a lot faster to export the data and more important it will keep the result set in order. While dumping the result set in batches it won't export duplicate documents in the export. All documents in the export will unique and therefore no missing documents.

NOTE: only works for output

Notes

• elasticdump (and elasticsearch in general) will create indices if they don't exist upon import
• when exporting from elasticsearch, you can have export an entire index (--input="http://localhost:9200/index") or a type of object from that index (--input="http://localhost:9200/index/type"). This requires ElasticSearch 1.2.0 or higher
• we are using the put method to write objects. This means new objects will be created and old objects with the same ID will be updated
• the file transport will overwrite any existing files
• If you need basic http auth, you can use it like this: --input=http://name:[email protected]:9200/my_index
• if you choose a stdio output (--output=$), you can also request a more human-readable output with --format=human
• if you choose a stdio output (--output=$), all logging output will be suppressed

Inspired by https://github.com/crate/elasticsearch-inout-plugin and https://github.com/jprante/elasticsearch-knapsack

Built at TaskRabbit