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Posted to reviews@impala.apache.org by "Lars Volker (Code Review)" <ge...@cloudera.org> on 2017/03/23 09:59:29 UTC

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Lars Volker has uploaded a new change for review.

  http://gerrit.cloudera.org:8080/6461

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................

IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

IMPALA-4226: Increase the thread count limit in the minidump stack
resolver. The old limit to 4096 is arbitrary and we are hitting it from
time to time.

IMPALA-4227: Add basic support for dwz dwarf extension
The dwz tool [1] can be used to compress symbols that occur in multiple
object files by moving them into a shared object file. It introduces new
DWARF macros to reference to those symbols.

Breakpad currently does not support those macros, which can lead to
crashes.

This change makes breakpad ignore these symbols. Impala's binaries don't
share symbols so we are not losing functionality with this change.

[1] https://sourceware.org/git/?p=dwz.git;a=summary

Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
---
M buildall.sh
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0001-Add-basic-support-for-dwz-dwarf-extension.patch
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
3 files changed, 112 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/native-toolchain refs/changes/61/6461/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has uploaded a new patch set (#2).

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................

IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

IMPALA-4226: Increase the thread count limit in the minidump stack
resolver. The old limit to 4096 is arbitrary and we are hitting it from
time to time.

IMPALA-4227: Add basic support for dwz dwarf extension
The dwz tool [1] can be used to compress symbols that occur in multiple
object files by moving them into a shared object file. It introduces new
DWARF macros to reference to those symbols.

Breakpad currently does not support those macros, which can lead to
crashes.

This change makes breakpad ignore these symbols. Impala's binaries don't
share symbols so we are not losing functionality with this change.

[1] https://sourceware.org/git/?p=dwz.git;a=summary

Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
---
M buildall.sh
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0001-Add-basic-support-for-dwz-dwarf-extension.patch
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Increase-maximum-number-of-threads-for-minidump_stac.patch
3 files changed, 120 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/native-toolchain refs/changes/61/6461/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 2
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 2:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/6461/2//COMMIT_MSG
Commit Message:

Line 24: [1] https://sourceware.org/git/?p=dwz.git;a=summary
> Can you comment on how you tested the changes. It would be interesting if o
Done


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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 2
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Tim Armstrong (Code Review)" <ge...@cloudera.org>.
Tim Armstrong has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 1:

(2 comments)

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 18: -uint32_t MinidumpThreadList::max_threads_ = 4096;
Should we try and get this fixed upstream? E.g. by making it a command-line flag?


Line 19: +uint32_t MinidumpThreadList::max_threads_ = 32786;
Is this enough? I believe sometimes we increase this further.


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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
Gerrit-Project: native-toolchain
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Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Bharath Vissapragada (Code Review)" <ge...@cloudera.org>.
Bharath Vissapragada has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 1:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 19: +uint32_t MinidumpThreadList::max_threads_ = 32786;
> The value here is used on the system symbolizing the minidump, so it is ind
Ouch ok. I just realized you are talking about minidump stack resolver. Thanks for clarifying.


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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Tim Armstrong (Code Review)" <ge...@cloudera.org>.
Tim Armstrong has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 1:

(2 comments)

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 18: -uint32_t MinidumpThreadList::max_threads_ = 4096;
> Good point, I pinged the breakpad dev list and suggested doing this. In tha
That's fine by me, this is causing pain right now so we should just fix it. It's just nice if we don't have to maintain our own patches long-term.


Line 19: +uint32_t MinidumpThreadList::max_threads_ = 32786;
> I haven't seen minidumps with more threads in the wild but I'm happy to bum
I think in some cases on large clusters we've seen the thread count bumped to several hundred thousand to get around our Thrift limitations. Would it be hard to make it configurable via a command line option or environment variable so we don't need to bump the value in the code if we run into it again?


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Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
Gerrit-Project: native-toolchain
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Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has submitted this change and it was merged.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

IMPALA-4226: Increase the thread count limit in the minidump stack
resolver. The old limit to 4096 is arbitrary and we are hitting it from
time to time.

To test this I ran minidump_stackwalk on a minidump with more than 4096
threads.

IMPALA-4227: Add basic support for dwz dwarf extension
The dwz tool [1] can be used to compress symbols that occur in multiple
object files by moving them into a shared object file. It introduces new
DWARF macros to reference to those symbols.

Breakpad currently does not support those macros, which can lead to
crashes.

This change makes breakpad ignore these symbols. Impala's binaries don't
share symbols so we are not losing functionality with this change.

To test this I ran dump_syms on a binary compiled on CentOS 7, which
uses DWZ for symbol compression.

[1] https://sourceware.org/git/?p=dwz.git;a=summary

Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
---
M buildall.sh
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0001-Add-basic-support-for-dwz-dwarf-extension.patch
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Increase-maximum-number-of-threads-for-minidump_stac.patch
3 files changed, 120 insertions(+), 1 deletion(-)

Approvals:
  Lars Volker: Verified
  Tim Armstrong: Looks good to me, approved



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Gerrit-MessageType: merged
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 3: Verified+1

Verified in a private build.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: No

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 3:

Thanks for the reviews. I started a private verification build (should've done that earlier).

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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
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Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: No

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Bharath Vissapragada (Code Review)" <ge...@cloudera.org>.
Bharath Vissapragada has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 3:

No more comments TM. LGTM.

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Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: No

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 1:

(2 comments)

Thanks for the review. Please see my inline comments.

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 18: -uint32_t MinidumpThreadList::max_threads_ = 4096;
> Should we try and get this fixed upstream? E.g. by making it a command-line
Good point, I pinged the breakpad dev list and suggested doing this. In that case we would need to bump our version, so it would require an additional change to the toolchain. Would you be ok with keeping this here as a workaround until it is fixed upstream?


Line 19: +uint32_t MinidumpThreadList::max_threads_ = 32786;
> Is this enough? I believe sometimes we increase this further.
I haven't seen minidumps with more threads in the wild but I'm happy to bump this to a larger number. I don't know what else will break if this gets too large, so I tried to stay somewhat conservative here. Do you have a suggestion?


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Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
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Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Tim Armstrong (Code Review)" <ge...@cloudera.org>.
Tim Armstrong has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 2: Code-Review+1

(1 comment)

Did you have any other comments, Bharath?

http://gerrit.cloudera.org:8080/#/c/6461/2//COMMIT_MSG
Commit Message:

Line 24: [1] https://sourceware.org/git/?p=dwz.git;a=summary
Can you comment on how you tested the changes. It would be interesting if others want to reproduce the problem.


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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 2
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Hello Tim Armstrong,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/6461

to look at the new patch set (#3).

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................

IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

IMPALA-4226: Increase the thread count limit in the minidump stack
resolver. The old limit to 4096 is arbitrary and we are hitting it from
time to time.

To test this I ran minidump_stackwalk on a minidump with more than 4096
threads.

IMPALA-4227: Add basic support for dwz dwarf extension
The dwz tool [1] can be used to compress symbols that occur in multiple
object files by moving them into a shared object file. It introduces new
DWARF macros to reference to those symbols.

Breakpad currently does not support those macros, which can lead to
crashes.

This change makes breakpad ignore these symbols. Impala's binaries don't
share symbols so we are not losing functionality with this change.

To test this I ran dump_syms on a binary compiled on CentOS 7, which
uses DWZ for symbol compression.

[1] https://sourceware.org/git/?p=dwz.git;a=summary

Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
---
M buildall.sh
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0001-Add-basic-support-for-dwz-dwarf-extension.patch
A source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Increase-maximum-number-of-threads-for-minidump_stac.patch
3 files changed, 120 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/native-toolchain refs/changes/61/6461/3
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Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
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Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Lars Volker (Code Review)" <ge...@cloudera.org>.
Lars Volker has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 2:

(2 comments)

Thanks for the reviews. I pushed a change upstream and picked it here, too.

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 19
> Or can this be polled from ulimits? getrlimit(RLIMIT_NPROC,..) ..The number
The value here is used on the system symbolizing the minidump, so it is independent from the one that wrote it.


Line 19
> I think in some cases on large clusters we've seen the thread count bumped 
After the discussion on breakpad-dev I think we can just set this to UINT_MAX. I changed this in PS2 to the same patch I pushed upstream.


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Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
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Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Bharath Vissapragada (Code Review)" <ge...@cloudera.org>.
Bharath Vissapragada has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 1:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/6461/1/source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch
File source/breakpad/breakpad-88e5b2c8806bac3f2c80d2fe80094be5bd371601-patches/0002-Bump-max_threads-and-max_regions.patch:

Line 19: +uint32_t MinidumpThreadList::max_threads_ = 32786;
> I think in some cases on large clusters we've seen the thread count bumped 
Or can this be polled from ulimits? getrlimit(RLIMIT_NPROC,..) ..The number of threads can't exceed that anyway?


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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 1
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: Yes

[native-toolchain-CR] IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols

Posted by "Tim Armstrong (Code Review)" <ge...@cloudera.org>.
Tim Armstrong has posted comments on this change.

Change subject: IMPALA-4226, IMPALA-4227: bump max threads, handle dwz compressed symbols
......................................................................


Patch Set 3: Code-Review+2

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Gerrit-MessageType: comment
Gerrit-Change-Id: I1bf83edd8cda037c31a842801ad1445f3fd4f71e
Gerrit-PatchSet: 3
Gerrit-Project: native-toolchain
Gerrit-Branch: master
Gerrit-Owner: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-HasComments: No