Stefan Egli created SLING-5701:
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Summary: ChunkCleanUpTask runs into an endless loop with empty
chunks
Key: SLING-5701
URL: https://issues.apache.org/jira/browse/SLING-5701
Project: Sling
Issue Type: Bug
Components: Servlets
Affects Versions: Servlets Post 2.3.10
Reporter: Stefan Egli
Fix For: Servlets Post 2.3.12
Normally chunks created by the SlingFileUploadHandler are formatted the
following way:
{code}
./chunk_0_19999
./chunk_20000_39999
./chunk_40000_45123
{code}
However consider a chunk which is formatted as follows:
{code}
./chunk_45124_45123
{code}
this will cause
[SlingFileUploadHandler.getLastChunk|https://github.com/apache/sling/blob/ded7f8d657ff54711d6e9bd7d6f76cca67c89df6/bundles/servlets/post/src/main/java/org/apache/sling/servlets/post/impl/helper/SlingFileUploadHandler.java#L487]
to enter an endless loop as it repeatedly sets the {{startPattern}} to
"{{./chunk_45124_45123}}" in the above case. Generally speaking, when you have
a chunk named '{{chunk_n_n-1}}' {{getLastChunk}} will do an endless loop.
You can also think of other scenarios where {{getLastChunk}} does an endless
loop - basically, whenever the {{indexBounds[1]}} is lower than
{{indexBounds[0]}} and hits an existing chunk name.
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