java-datastore: LocalDatastoreHelper is downloading datastore emulator zip every time even when file exists

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#12,058 opened on Mar 9, 2026 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 1/5
Estimated time: Under an hour
Newbie friendliness: 65/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Quiet
Tech stack: java
Domain: databases

Research direction

Start in java-datastore/google-cloud-datastore/src/main/java/com/google/cloud/datastore/testing/LocalDatastoreHelper.java, then compare the checksum passed to BaseEmulatorHelper.java with the documented MD5. Done means the checksum matches 7c1f5a3276241a8f78cb1a837daaaa47 and an existing emulator zip is not downloaded again.

Written by the indexing model from the issue text.

Description

api: datastore priority: p3 type: bug

When the LocalDatastoreHelper is started with .start() API it is downloading a 36mb zip file from http://storage.googleapis.com/gcd/tools/cloud-datastore-emulator-2.3.1.zip every time even if file already exist locally.

This is due to checksum mismatch at:

https://github.com/googleapis/sdk-platform-java/blob/56aa3438393e1992bb8f688291fb12030ec9bc0e/java-core/google-cloud-core/src/main/java/com/google/cloud/testing/BaseEmulatorHelper.java#L465-L479

The checksum value that LocalDatastoreHelper is passing down is not correct:

https://github.com/googleapis/google-cloud-java/blob/aa2c24982903071ab0408fac4357fb8dd067a3fa/java-datastore/google-cloud-datastore/src/main/java/com/google/cloud/datastore/testing/LocalDatastoreHelper.java#L68

The actual file checksum is 7c1f5a3276241a8f78cb1a837daaaa47:

> curl http://storage.googleapis.com/gcd/tools/cloud-datastore-emulator-2.3.1.
zip | md5sum
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 36.1M  100 36.1M    0     0  8831k      0  0:00:04  0:00:04 --:--:-- 8833k
7c1f5a3276241a8f78cb1a837daaaa47  -

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