[jira] [Created] (LENS-279) Redesigning lens server state persistence with respect to synchronization

["Himanshu Gahlaut (JIRA)" <ji...@apache.org>]

Himanshu Gahlaut created LENS-279:
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             Summary: Redesigning lens server state persistence with respect to synchronization
                 Key: LENS-279
                 URL: https://issues.apache.org/jira/browse/LENS-279
             Project: Apache Lens
          Issue Type: Improvement
            Reporter: Himanshu Gahlaut


Currently writeExternal method of various lens classes writes to an ObjectOutputStream for persisting state of objects. These writeExternal method calls are triggered from a code block in LensServices class which is a synchronized code block. All write methods are coming within synchronized blocks in all classes. writeExternal method can take long time due to slowness in filesystem and that can block other synchronized methods in these classes, which come under query execution flow. This locking and slowness in filesystem can decrease the performance of query execution flow. An improved approach can be to make a copy of the entire state to be persisted with synchronization and then write to file system in a non synchronized code block. This would result in locking a lighter portion of code (in memory copy) instead of creating locks around relatively heavier portion of code (writes to filesystem). 



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