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Avoid panic on multiple closer.Signal calls #1401

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merged 2 commits into from
Jul 9, 2020

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jarifibrahim
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@jarifibrahim jarifibrahim commented Jul 8, 2020

The closer.Signal function closes a channel and multiple calls to the
closing the same channel would cause a "channel already closed". This PR
avoids the panic by using a sync.Once while closing the channel.

Multiple calls to closer.Signal would be no-op with this commit.

Fixes DGRAPH-1581


This change is Reviewable

The closer.Signal function closes a channel and multiple calls to the
closing the same channel would cause a "channel already closed". This PR
avoids the panic by using a sync.Once while closing the channel.

Multiple calls to closer.Signal would be no-op with this commit.
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:lgtm:

Reviewed 1 of 1 files at r1.
Reviewable status: :shipit: complete! all files reviewed, all discussions resolved (waiting on @ashish-goswami and @manishrjain)

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:lgtm:

Reviewed 1 of 1 files at r1.
Reviewable status: :shipit: complete! all files reviewed, all discussions resolved (waiting on @manishrjain)

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:lgtm: please add UT and a TODO as discussed.

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @manishrjain)

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The travis build for 32 bit CPU is failing and it is an existing issue, not related to this PR.

@jarifibrahim jarifibrahim merged commit b79aeef into master Jul 9, 2020
@jarifibrahim jarifibrahim deleted the ibrahim/closer-crash branch July 9, 2020 11:58
jarifibrahim pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 11, 2020
Also, disable conflict detection in badger to save memory.

```
0dfb8b4 Changelog for v20.07.0 (dgraph-io/badger#1411)
03ba278 Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
6001230 Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
800305e Revert "Buffer pool for decompression
(dgraph-io/badger#1308)"
(dgraph-io/badger#1408)
63d9309 Revert "fix: Fix race condition in block.incRef
(dgraph-io/badger#1337)"
(dgraph-io/badger#1407)
e0d058c Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
d981f47 return error if the vlog writes exceeds more that 4GB.
(dgraph-io/badger#1400)
7f4e4b5 add assert to check integer overflow for table size
(dgraph-io/badger#1402)
8e896a7 Add a contribution guide
(dgraph-io/badger#1379)
b79aeef Avoid panic on multiple closer.Signal calls
(dgraph-io/badger#1401)
717b89c Enable cross-compiled 32bit tests on TravisCI
(dgraph-io/badger#1392)
09dfa66 Update ristretto to commit f66de99
(dgraph-io/badger#1391)
509de73 Update head while replaying value log
(dgraph-io/badger#1372)
e013bfd Rework DB.DropPrefix (dgraph-io/badger#1381)
3042e37 pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
675efcd Increase default valueThreshold from 32B to 1KB
(dgraph-io/badger#1346)
158d927 Remove second initialization of writech in Open
(dgraph-io/badger#1382)
d37ce36 Tests: Use t.Parallel in TestIteratePrefix tests
(dgraph-io/badger#1377)
3f4761d Force KeepL0InMemory to be true when InMemory is true
(dgraph-io/badger#1375)
dd332b0 Avoid panic in filltables()
(dgraph-io/badger#1365)
c45d966 Fix assert in background compression and encryption.
(dgraph-io/badger#1366)
```
jarifibrahim pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 11, 2020
This commit brings the following new changes from badger.
This commit also disable conflict detection in badger to save memory.
```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```
jarifibrahim pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 11, 2020
This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```
jarifibrahim pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 11, 2020
This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```
jarifibrahim pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 11, 2020
This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```
parasssh pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 13, 2020
* Update badger to v20.07.0-rc1

This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```

* Remove unnecessary detect conflicts
parasssh pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 13, 2020
* Update badger to v20.07.0-rc1

This commit brings the following new changes from badger.
This commit also disable conflict detection in badger to save memory.
```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```

* Remove unnecessary detect conflicts
parasssh pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 13, 2020
* Update badger to v20.07.0-rc1

This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```

* Remove unnecessary detect conflicts

Co-authored-by: parasssh <[email protected]>
parasssh pushed a commit to dgraph-io/dgraph that referenced this pull request Jul 13, 2020
* Update badger to v20.0.7-rc1

This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```

* Remove unnecessary detect conflicts

Co-authored-by: parasssh <[email protected]>
dna2github pushed a commit to dna2fork/dgraph that referenced this pull request Jul 18, 2020
* Update badger to v20.07.0-rc1

This commit brings the following new changes from badger.
This commit also disable conflict detection in badger to save memory.
```
Fix assert in background compression and encryption. (dgraph-io/badger#1366)
Avoid panic in filltables() (dgraph-io/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (dgraph-io/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (dgraph-io/badger#1377)
Remove second initialization of writech in Open (dgraph-io/badger#1382)
Increase default valueThreshold from 32B to 1KB (dgraph-io/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (dgraph-io/badger#1371)
Rework DB.DropPrefix (dgraph-io/badger#1381)
Update head while replaying value log (dgraph-io/badger#1372)
Update ristretto to commit f66de99 (dgraph-io/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (dgraph-io/badger#1392)
Avoid panic on multiple closer.Signal calls (dgraph-io/badger#1401)
Add a contribution guide (dgraph-io/badger#1379)
add assert to check integer overflow for table size (dgraph-io/badger#1402)
return error if the vlog writes exceeds more that 4GB. (dgraph-io/badger#1400)
Revert "add assert to check integer overflow for table size (dgraph-io/badger#1402)" (dgraph-io/badger#1406)
Revert "fix: Fix race condition in block.incRef (dgraph-io/badger#1337)" (dgraph-io/badger#1407)
Revert "Buffer pool for decompression (dgraph-io/badger#1308)" (dgraph-io/badger#1408)
Revert "Compress/Encrypt Blocks in the background (dgraph-io/badger#1227)" (dgraph-io/badger#1409)
Add missing changelog for v2.0.3 (dgraph-io/badger#1410)
Changelog for v20.07.0 (dgraph-io/badger#1411)
```

* Remove unnecessary detect conflicts
jarifibrahim pushed a commit that referenced this pull request Oct 2, 2020
The closer.Signal function closes a channel and multiple calls to the
closing the same channel would cause a "channel already closed". This PR
avoids the panic by using a sync.Once while closing the channel.

Multiple calls to closer.Signal would be no-op with this commit.

Fixes DGRAPH-1581
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4 participants