[jira] Updated: (NUTCH-893) DataStore.put() silently loses records when executed from multiple processes
[ https://issues.apache.org/jira/browse/NUTCH-893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Julien Nioche updated NUTCH-893: Fix Version/s: 2.0 Priority: Blocker (was: Major) Marking as blocker and must be fixed for 2.0 DataStore.put() silently loses records when executed from multiple processes Key: NUTCH-893 URL: https://issues.apache.org/jira/browse/NUTCH-893 Project: Nutch Issue Type: Bug Affects Versions: 2.0 Environment: Gora HEAD, SqlStore, MySQL 5.1, Ubuntu 10.4 x64, Sun JDK 1.6 Reporter: Andrzej Bialecki Priority: Blocker Fix For: 2.0 Attachments: NUTCH-893.patch In order to debug the issue described in NUTCH-879 I created a test to simulate multiple clients appending to webtable (please see the patch), which is the situation that we have in distributed map-reduce jobs. There are two tests there: one that uses multiple threads within the same JVM, and another that uses single thread in multiple JVMs. Each test first clears webtable (be careful!), and then puts a bunch of pages, and finally counts that all are present and their values correspond to keys. To make things more interesting each execution context (thread or process) closes and reopens its instance of DataStore a few times. The multithreaded test passes just fine. However, the multi-process test fails with missing keys, as many as 30%. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (NUTCH-893) DataStore.put() silently loses records when executed from multiple processes
[ https://issues.apache.org/jira/browse/NUTCH-893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Andrzej Bialecki updated NUTCH-893: Attachment: NUTCH-893.patch Unit test to illustrate the issue. DataStore.put() silently loses records when executed from multiple processes Key: NUTCH-893 URL: https://issues.apache.org/jira/browse/NUTCH-893 Project: Nutch Issue Type: Bug Affects Versions: 2.0 Environment: Gora HEAD, SqlStore, MySQL 5.1, Ubuntu 10.4 x64, Sun JDK 1.6 Reporter: Andrzej Bialecki Attachments: NUTCH-893.patch In order to debug the issue described in NUTCH-879 I created a test to simulate multiple clients appending to webtable (please see the patch), which is the situation that we have in distributed map-reduce jobs. There are two tests there: one that uses multiple threads within the same JVM, and another that uses single thread in multiple JVMs. Each test first clears webtable (be careful!), and then puts a bunch of pages, and finally counts that all are present and their values correspond to keys. To make things more interesting each execution context (thread or process) closes and reopens its instance of DataStore a few times. The multithreaded test passes just fine. However, the multi-process test fails with missing keys, as many as 30%. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
