Kevin Liang created SOLR-18299:
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Summary: 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
Reporter: Kevin Liang
+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).
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