Bug ID: JDK-8222532 (zipfs) Performance regression when writing ZipFileSystem entries in parallel

JDK-8222532 : (zipfs) Performance regression when writing ZipFileSystem entries in parallel

Type: Bug
Component: core-libs
Sub-Component: java.nio
Affected Version: 11.0.3,12,13

Priority: P3
Status: Resolved
Resolution: Fixed

Submitted: 2019-04-16
Updated: 2020-09-17
Resolved: 2019-04-24

Versions (Unresolved/Resolved/Fixed)

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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 11	JDK 12	JDK 13
11.0.4Fixed	12.0.2Fixed	13 b18Fixed

Related Reports

Duplicate :	JDK-8223401 - Inefficiency in ZipFileSystem.sync()
Relates :	JDK-8034802 - (zipfs) newFileSystem throws UOE when the zip file is located in a custom file system
Relates :	JDK-8229887 - (zipfs) zip file corruption when replacing an existing STORED entry
Relates :	JDK-8223597 - (zipfs) jdk/nio/zipfs/ZipFSTester.java RuntimeException: CHECK_FAILED! (getAttribute.crc failed 6af4413c vs 0 ...)

Description

Reported by Lennart B��rjeson here: http://mail.openjdk.java.net/pipermail/core-libs-dev/2019-April/059734.html

Narrowed down the cause as JDK-8034802 due changing deflation to only happen when syncing the ZipFileSystem whereas it previously happened eagerly when closing output streams retrieved via Files.newOutputStream: http://mail.openjdk.java.net/pipermail/core-libs-dev/2019-April/059753.html

Proof-of-concept patch that recuperates the parallelism in the default case: http://cr.openjdk.java.net/~redestad/scratch/zfs.eager_deflation.00/

Comments

Fix Request This resolves the performance/memory regression caused by JDK-8034802 (that is already backported in JDK 11.0.3). Patch applies cleanly to 11u. The jdk/nio/zipfs tests pass with the backport.

07-05-2019