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  1. JDK
  2. JDK-8267666

Add option to jcmd GC.heap_dump to use existing file

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      Description

        Now GC.heap_dump expects to create a new file for heap dump and it bails out if the target file exists.

        User may want to use an existing file. It is necessary if the target file is a predefined file-like object, like a named pipe, socket,..

        This enhancement adds an option to allow to rewrite an existing file content. It also allows use-cases when the file is a file-like object.

        It can be used to add more compression methods for heap dump in addition to gzip, which is supported by JVM natively, for example on (on Linux):

            # create intermediate named FIFO
            mkfifo testfifo
            # compress with LZ4 and write to file
            lz4cat - < testfifo > dump.hprof.lz4
            # dump the heap
            jcmd Test GC.heap_dump -overwrite testfifo

        Or send the dump over network (to REMOTE:PORT)

            nc $REMOTE $PORT < testfifo
            jcmd Test GC.heap_dump -overwrite testfifo

                 

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8271213 Add option to jcmd GC.heap_dump to use existing file

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8271214 Add option to jcmd GC.heap_dump to use existing file

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8271700 Add option to jcmd GC.heap_dump to use existing file

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            csr for

            CSR - null JDK-8267667 Add option to jcmd GC.heap_dump to use existing file

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            duplicates

            Enhancement - null JDK-8200579 Unable to overwrite files with jmap -dump:file=<path>

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8263066 Add option to jcmd to overwrite a heap dump or stream to special files

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Enhancement - null JDK-8272318 Improve performance of HeapDumpAllTest

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8270341 Test serviceability/dcmd/gc/HeapDumpAllTest.java timed-out

            • P3 - Major loss of function.
            • Resolved
            links to

            Commit Commit openjdk/jdk11u-dev/67622161

            Commit Commit openjdk/jdk17u/9b6aa530

            Commit Commit openjdk/jdk/7cbb67a3

            Review Review openjdk/jdk11u-dev/131

            Review Review openjdk/jdk17u/2

            Review Review openjdk/jdk/4183

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                akozlov Anton Kozlov
                akozlov Anton Kozlov
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                  Updated:
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