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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