Test: new randomized stress tester for #3343 alike bugs.

Stress tester WIP.

Regression test for issue #3343 exact min crash sequence.

Note: it was verified that it can crash the test suite without the patch
applied.

Test ZINCRBY return value.

Test: fix false positive in HSTRLEN test.

HINCRBY* tests later used the value "tmp" that was sometimes generated
by the random key generation function. The result was ovewriting what
Tcl expected to

Test: fix false positive in HSTRLEN test.

HINCRBY* tests later used the value "tmp" that was sometimes generated
by the random key generation function. The result was ovewriting what
Tcl expected to be inside Redis with another value, causing the next
HSTRLEN test to fail.

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Test: print info on HSTRLEN test failure.

This additional info may provide more clues about the test randomly
failing from time to time. Probably the failure is due to some previous
test that overwr

Test: print info on HSTRLEN test failure.

This additional info may provide more clues about the test randomly
failing from time to time. Probably the failure is due to some previous
test that overwrites the logical content in the Tcl variable, but this
will make the problem more obvious.

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Test: ZADD CH tests

Test: ZADD INCR test

Test: ZADD NX and XX options tests

uphold the smove contract to return 0 when the element is not a member of the source set, even if source=dest

Test: HSTRLEN stress test of corner cases.

Main point here is to correctly report LLONG_MIN length, since to take
the absolute value we need care in sdigits10().

Hash: HSTRLEN (was HVSTRLEN) improved.

1. HVSTRLEN -> HSTRLEN. It's unlikely one needs the length of the key,
not clear how the API would work (by value does not make sense) and
there will be

Hash: HSTRLEN (was HVSTRLEN) improved.

1. HVSTRLEN -> HSTRLEN. It's unlikely one needs the length of the key,
not clear how the API would work (by value does not make sense) and
there will be better names anyway.
2. Default is to return 0 when field is missing.
3. Default is to return 0 when key is missing.
4. The implementation was slower than needed, and produced unnecessary COW.

Related issue #2415.

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Test: fixes a few tests after basic unit refactoring.

Test: split basic unit into string, incr, keyspace units.

added a new hvstrlen command

the hvstrlen command returns the length of a hash field value

SPOP explicit tests for the three different code paths.

Config: Add quicklist, remove old list options

This removes:
- list-max-ziplist-entries
- list-max-ziplist-value

This adds:
- list-max-ziplist-size
- list-compress-depth

Also updates confi

Config: Add quicklist, remove old list options

This removes:
- list-max-ziplist-entries
- list-max-ziplist-value

This adds:
- list-max-ziplist-size
- list-compress-depth

Also updates config file with new sections and updates
tests to use quicklist settings instead of old list settings.

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Add quicklist implementation

This replaces individual ziplist vs. linkedlist representations
for Redis list operations.

Big thanks for all the reviews and feedback from everybody in
https://github.

Add quicklist implementation

This replaces individual ziplist vs. linkedlist representations
for Redis list operations.

Big thanks for all the reviews and feedback from everybody in
https://github.com/antirez/redis/pull/2143

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Added <count> parameter to SPOP:
spopCommand() now runs spopWithCountCommand() in case the <count> param is found.
Added intsetRandomMembers() to Intset: Copies N random members from the set into inp

Added <count> parameter to SPOP:
spopCommand() now runs spopWithCountCommand() in case the <count> param is found.
Added intsetRandomMembers() to Intset: Copies N random members from the set into inputted 'values' array. Uses either the Knuth or Floyd sample algos depending on ratio count/size.
Added setTypeRandomElements() to SET type: Returns a number of random elements from a non empty set. This is a version of setTypeRandomElement() that is modified in order to return multiple entries, using dictGetRandomKeys() and intsetRandomMembers().
Added tests for SPOP with <count>: unit/type/set, unit/scripting, integration/aof
--
Cleaned up code a bit to match with required Redis coding style

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Test: check sorted set elements order after union.

This is not a regression but issue #1786 showed the need for this test.

Fix blocking operations from missing new lists

Behrad Zari discovered [1] and Josiah reported [2]: if you block
and wait for a list to exist, but the list creates from
a non-push command, the blocke

Fix blocking operations from missing new lists

Behrad Zari discovered [1] and Josiah reported [2]: if you block
and wait for a list to exist, but the list creates from
a non-push command, the blocked client never gets notified.

This commit adds notification of blocked clients into
the DB layer and away from individual commands.

Lists can be created by [LR]PUSH, SORT..STORE, RENAME, MOVE,
and RESTORE. Previously, blocked client notifications were
only triggered by [LR]PUSH. Your client would never get
notified if a list were created by SORT..STORE or RENAME or
a RESTORE, etc.

Blocked client notification now happens in one unified place:
- dbAdd() triggers notification when adding a list to the DB

Two new tests are added that fail prior to this commit.

All test pass.

Fixes #1668

[1]: https://groups.google.com/forum/#!topic/redis-db/k4oWfMkN1NU
[2]: #1668

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Fuzzy test for ZREMRANGEBYLEX added.

Sorted set lex ranges stress tester.

Basic ZRANGEBYLEX / ZLEXCOUNT tests.

SDIFF iterator misuse bug regression test added.

See commit c00453d for more info about the bug.