Jakob Sultan Ericsson created COMPRESS-466:
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Summary: Opening of a very large zip file is extremely slow
compared to java.util.zip.ZipFile
Key: COMPRESS-466
URL: https://issues.apache.org/jira/browse/COMPRESS-466
Project: Commons Compress
Issue Type: Bug
Components: Compressors
Affects Versions: 1.18
Environment: Tested both on Linux and OSX 10.13.6.
Reporter: Jakob Sultan Ericsson
We have a quite large zip file 35 gb and try to open this with ZipFile.
{code:java}
try (ZipFile zf = new ZipFile(new File("35gb.zip"))) {
System.out.println("File opened..." + (System.currentTimeMillis() -
start));
}
{code}
This code takes about 300 000 - 400 000 ms (5-6 minutes).
If I run this with JDK-builtin java.util.zip.ZipFile, same code takes 300 ms
(less than a second).
I'm not totally sure what it is the problem but I did some debugging and
basically all time is spent in
{code:java}
private void resolveLocalFileHeaderData(final Map<ZipArchiveEntry,
NameAndComment> entriesWithoutUTF8Flag)
{code}
Anything that can be done to improve this?
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