[jira] [Created] (BEAM-1315) FileBasedSink could write tmp files above the output prefix.

["Pei He (JIRA)" <ji...@apache.org>]

Pei He created BEAM-1315:
----------------------------

             Summary: FileBasedSink could write tmp files above the output prefix.
                 Key: BEAM-1315
                 URL: https://issues.apache.org/jira/browse/BEAM-1315
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Pei He
            Priority: Minor


FileBasedWriteOperation.TemporaryDirectoryBuilder tempDirBuilder =
    new FileBasedWriteOperation.TemporaryDirectoryBuilder();
tempDirBuilder.apply("/home/output/"),

apply() returns "/home/temp-beam-output-2017-01-25_22-14-49"

And, it was not under the output prefix "/home/output/".

Examples of Path resolve:
Paths.get("/home/output").resolve("temp-beam");
Paths.get("/home/output/").resolve("temp-beam");
/home/output/temp-beam
/home/output/temp-beam

Paths.get("/home/output").resolve("..").resolve("temp-beam");
Paths.get("/home/output/").resolve("..").resolve("temp-beam");
/home/output/../temp-beam
/home/output/../temp-beam

Paths.get("/home/output").resolveSibling("temp-beam");
Paths.get("/home/output/").resolveSibling("temp-beam");
/home/temp-beam
/home/temp-beam




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