[GitHub] [hadoop-ozone] bharatviswa504 commented on issue #89: HDDS-2322. DoubleBuffer flush termination and OM shutdown's after that. Make entry returned from cache a new copy.

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bharatviswa504 commented on issue #89: HDDS-2322. DoubleBuffer flush termination and OM shutdown's after that. Make entry returned from cache a new copy.
URL: https://github.com/apache/hadoop-ozone/pull/89#issuecomment-547022709
 
 
   > https://issues.apache.org/jira/browse/HDDS-2356 issue happens here as well. From the stack I got, it looks like it may also be related to partKeyInfoList as TreeMap in OmMultipartKeyInfo.java being not thread safe. I may have little background knowledge here, but from the logs I got after running in actual env, it shows some other errors in https://issues.apache.org/jira/browse/HDDS-2356.
   > 
   > I wonder if we need to stay with TreeMap as a data structure since it's hard to make TreeMap thread safe.
   > 
   > Looks like after this change, there happens another recurring error in VM cluster. Please see https://issues.apache.org/jira/browse/HDDS-2356 for more info. I test several times and unfortunately the new issue seems to persist.
   
   Thank You for trying out the fix. On a bucket, multipart upload complete cannot occur in parallel, as we acquire bucket lock and then perform the operation(during write/get), so I think we don't require TreeMap to be synchronized/thread-safe.
   

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