lbryio / lbryio/hub

Handle elasticsearch becoming read only due to low disk space

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area: elasticsearch consider soon type: bug
Dominant language
Python
Stars
15
Forks
16
PR merge metrics
No merged PRs in 30d

Description

The elastic sync service should handle ES temporarily becoming read only and recover when ES becomes writable, currently the failed queries are ignored:

```2022-04-02 10:42:23,620 - scribe.service.ElasticSyncService - WARNING - indexing failed for an item: {'update': {'_index': 'claims', '_type': '_doc', '_id': '4023ca39b415cd916a304d71a3d528d8770f2ca5', 'status': 429, 'error': {'type': 'cluster_block_exception', 'reason': 'index [claims] blocked by: [TOO_MANY_REQUESTS/12/disk usage exceeded flood-stage watermark, index has read-only-allow-delete block];'}}}```

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the ElasticSyncService path that logs indexing failures and inspect how Elasticsearch bulk responses are handled. Reproduce the read-only 429 condition if possible, then verify that failed indexing is not silently ignored and that synchronization recovers after Elasticsearch becomes writable.

Written by the indexing model from the issue text.

Assessment

Tech stack
elasticsearch, python
Domain
backend, databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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