[ https://issues.apache.org/jira/browse/HADOOP-16112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16859949#comment-16859949 ]
Lisheng Sun edited comment on HADOOP-16112 at 6/10/19 11:56 AM: ---------------------------------------------------------------- [~hexiaoqiao] , thanks for the reply. Reproduce it as follow: {code:java} try { fs -mkdir /user/test fs -mkdir /user/test/a fs -mkdir /user/test/a/b } catch (FileAlreadyExistsException e) { fs -rm -r/user/test/a (another thread) fs -mkdir /user/test/a/b } {code} The current code is intented to mkdir /user/test/a+timestamp/b, but in actual mkdir /user/test+timestamp/a/b. was (Author: leosun08): [~hexiaoqiao] , thanks for the reply. Reproduce it as follow: {code:java} try { fs -mkdir /user/test fs -mkdir /user/test/a fs -mkdir /user/test/a/b } catch (FileAlreadyExistsException e) { fs -rm -r/user/test/a (another thread) fs -mkdir /user/test/a/b } {code} The current code is intented to mkdir /user/test/a+timestamp/b, but in actual mkdir /user/test+timestamp/a/b. But, the race condition is reproduced hard by Unit Test. > Delete the baseTrashPath's subDir leads to don't modify baseTrashPath > --------------------------------------------------------------------- > > Key: HADOOP-16112 > URL: https://issues.apache.org/jira/browse/HADOOP-16112 > Project: Hadoop Common > Issue Type: Bug > Components: common > Affects Versions: 3.2.0 > Reporter: Lisheng Sun > Priority: Major > Attachments: HADOOP-16112.001.patch, HADOOP-16112.002.patch > > > There is race condition in TrashPolicyDefault#moveToTrash > try { > if (!fs.mkdirs(baseTrashPath, PERMISSION)) > { // create current LOG.warn("Can't create(mkdir) trash directory: " + > baseTrashPath); return false; } > } catch (FileAlreadyExistsException e) { > // find the path which is not a directory, and modify baseTrashPath > // & trashPath, then mkdirs > Path existsFilePath = baseTrashPath; > while (!fs.exists(existsFilePath)) > { existsFilePath = existsFilePath.getParent(); } > {color:#ff0000}// case{color} > {color:#ff0000} other thread deletes existsFilePath here ,the results > doesn't meet expectation{color} > {color:#ff0000} for example{color} > {color:#ff0000} there is > /user/u_sunlisheng/.Trash/Current/user/u_sunlisheng/b{color} > {color:#ff0000} when delete /user/u_sunlisheng/b/a. if existsFilePath is > deleted, the result is > /user/u_sunlisheng/.Trash/Current/user/u_sunlisheng+timstamp/b/a{color} > {color:#ff0000} so when existsFilePath is deleted, don't modify > baseTrashPath. {color} > baseTrashPath = new Path(baseTrashPath.toString().replace( > existsFilePath.toString(), existsFilePath.toString() + Time.now()) > ); > trashPath = new Path(baseTrashPath, trashPath.getName()); > // retry, ignore current failure > --i; > continue; > } catch (IOException e) > { LOG.warn("Can't create trash directory: " + baseTrashPath, e); cause = e; > break; } -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org