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https://issues.apache.org/jira/browse/COMPRESS-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18011095#comment-18011095
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Zhang Di commented on COMPRESS-702:
-----------------------------------
Hi Gary
I have identified the root cause of the issue and will submit a PR to resolve
it shortly.
> performance issue found when using SevenZFile
> ---------------------------------------------
>
> Key: COMPRESS-702
> URL: https://issues.apache.org/jira/browse/COMPRESS-702
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers, Compressors
> Affects Versions: 1.27.1
> Reporter: Zhang Di
> Priority: Major
>
> I found a performance issue after upgrading commons-compress from version
> 1.26.1 to 1.27.1.
> Here are some details:
> {*}Issue Method{*}:
> SevenZFile.java
> public InputStream getInputStream(final SevenZArchiveEntry entry)throws
> IOException
> {*}Test Case{*}:
> ```java
> public static void main(String[] args) {
> try(SevenZFile SevenZFile = new SevenZFile(new File("D:\\xxx.7z"))) {
> byte[] buffer = new byte[8192];
> SevenZArchiveEntry entry;
> while((entry = SevenZFile.getNextEntry())!=null){
> if(entry.isDirectory()){
> continue;
> }
> InputStream inputStream = SevenZFile.getInputStream(entry);
> File outputFile = new File("D:\\7ztest\\" + entry.getName());
> if(!outputFile.getParentFile().exists()){
> outputFile.getParentFile().mkdirs();
> }
> try(FileOutputStream fos = new FileOutputStream(outputFile)){
> while(inputStream.read(buffer>0)){
> fos.write(buffer);
> }
> }catch(FileNotFoundException e){
> e.printStackTrace();
> }catch(IOException e){
> e.printStackTrace();
> }
> }
> } catch (Exception e) {
> }
> }
> ```
> I tested this case on 1.26.1 and it cost about 900 ms , while on the other
> hand it cost 120,000 ms on 1.27.1. I am trying to figure out the cause, but
> still can not find a clue.
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