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Stefan Bodewig resolved COMPRESS-466. ------------------------------------- Resolution: Fixed Fix Version/s: 1.19 Thank you for testing. It's easier to be "bold" when you are familiar with the code :) > 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 > Priority: Major > Fix For: 1.19 > > > 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? -- This message was sent by Atlassian JIRA (v7.6.3#76005)