Downloaded segments – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.8

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Briefly, this error occurs when OpenSearch is unable to download segments from the source during a snapshot restore or replication process. This could be due to network issues, insufficient permissions, or problems with the source data. To resolve this, you can check your network connectivity, ensure OpenSearch has the necessary permissions to access the source, and verify the integrity of the source data. If the problem persists, consider reindexing the data or creating a new snapshot.

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This guide will help you check for common problems that cause the log ” Downloaded segments: {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: shard, index.

Log Context

Log “Downloaded segments: {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } catch (IOException e) {
            throw new IndexShardRecoveryException(shardId; "Exception while copying segment files from remote segment store"; e);
        } finally {
  "Downloaded segments: {}"; downloadedSegments);
  "Skipped download for segments: {}"; skippedSegments);


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