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Posted to issues@solr.apache.org by "Kevin Liang (Jira)" <ji...@apache.org> on 2026/07/02 21:51:00 UTC
[jira] [Resolved] (SOLR-18299) IndexFetcher fails on files of exactly a multiple of PACKET_SZ
[ https://issues.apache.org/jira/browse/SOLR-18299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kevin Liang resolved SOLR-18299.
--------------------------------
Resolution: Duplicate
Closing as duplicate of SOLR-18098
> IndexFetcher fails on files of exactly a multiple of PACKET_SZ
> --------------------------------------------------------------
>
> Key: SOLR-18299
> URL: https://issues.apache.org/jira/browse/SOLR-18299
> Project: Solr
> Issue Type: Bug
> Affects Versions: 9.8.1
> Reporter: Kevin Liang
> Priority: Major
>
> +Description:+
> In Solr 9.8.1 (and likely Solr 10) cloud mode with TLOG/PULL, if a segment file is exactly a multiple of PACKET_SZ (defaults to 1MB) IndexFetcher will always fail to download it and hit an unexpected EOF. This will occur for some time until the culprit file gets merged away, and then the cloud will continue to operate as normal.
> +Impact:+
> The non-TLOG replicas will be unable to replicate any further index files and will go "stale" until fixed.
> +Stack Trace:+
>
> {code:java}
> 2026-06-28 13:57:00.443 WARN IndexFetcher [solr9_collection shard36 core_node478 solr9_collection_shard36_replica_p477] ? [indexFetcher-170-thread-1] - Error in fetching file: _7k9z8.cfs (downloaded 1048576 of 1048576 bytes)
> java.io.EOFException: null
> at org.apache.solr.common.util.FastInputStream.readFully(FastInputStream.java:178) ~[solr-solrj-9.8.1.jar:9.8.1 2a113bf20593cbee7446d8130f2a68bbb6748916 - cloud-user - 2025-10-01 20:57:41]
> at org.apache.solr.common.util.FastInputStream.readFully(FastInputStream.java:170) ~[solr-solrj-9.8.1.jar:9.8.1 2a113bf20593cbee7446d8130f2a68bbb6748916 - cloud-user - 2025-10-01 20:57:41]
> at org.apache.solr.handler.IndexFetcher$FileFetcher.fetchPackets(IndexFetcher.java:1845) ~[solr-core-9.8.1.jar:9.8.1 2a113bf20593cbee7446d8130f2a68bbb6748916 - cloud-user - 2025-10-01 20:57:41]
> {code}
>
> A main hallmark of this issue is the java.io.EOFException, however you will always see a "downloaded X of X bytes" (which should ring alarm bells that something is out of place).
> +Steps to reproduce:+
> It's hard to force in a live environment, but theoretically you could fill a dummy segment file with a set number of bytes and add it to the index manifest. It is 100% reproducible via integration test
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