Android has been stuck in download maven-metadata.xml
During the process of updating the project for Android studio, the projects before
build: Download maven-metadata.xml…
Running normally.
Treatment method
stackoverflow
Change to offline mode in gradle window
[xxxx@gs-server-7214 ~]$ /opt/anaconda3/bin/jupyter notebook
-bash: /opt/anaconda3/bin/jupyter: /opt/anaconda3/bin/python: Bad interpreter: No that file or directory
[xxxx@gs-server-7214 ~]$ /opt/anaconda3/bin/python3
Python 3.6.10 |Anaconda, Inc.| (default, May 8 2020, 02:54:21)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
[1]+ Stop /opt/anaconda3/bin/python3
/opt/anaconda3/bin/python3 - M PIP install Jupiter
- & gt</ Code> indicates soft connection </ OL>
[xxxx@gs-server-7214 bin]$ ll |grep python
-rwxrwxr-x 1 root root 237 10月 24 2019 ipython
-rwxrwxr-x 1 root root 237 10月 24 2019 ipython3
lrwxrwxrwx 1 root root 9 7月 16 16:31 python -> python3.6
lrwxrwxrwx 1 root root 9 8月 28 2020 python3 -> python3.6
-rwxrwxr-x 1 root root 11947112 5月 8 2020 python3.6
lrwxrwxrwx 1 root root 17 8月 28 2020 python3.6-config -> python3.6m-config
lrwxrwxrwx 1 root root 9 8月 28 2020 python3.6m -> python3.6
-rwxrwxr-x 1 root root 3477 8月 28 2020 python3.6m-config
lrwxrwxrwx 1 root root 17 8月 28 2020 python3-config -> python3.6m-config
and modify the . Bash in your user directory_ Profile file, add environment variable, export path =/opt/anaconda3/bin: $path , colon is separatorsource .bash_ Profile makes the environment variable effective, so you can start jupyter by directly entering jupyter notebook in your user directory.
StaleElementReferenceException
Problem reporting and solution
Problem reporting error
# clcik to the next page
web.find_element_by_xpath('//*[@id="nexthehe"]').click()
the element is no longer attached to the DOM : the element is no longer attached to the dom
Solution:
The element is no longer attached to the dom
Analyze the cause
It is possible that elements that are no longer attached to the DOM tree are guided (for example, document. Documentelement)
But the page content is not loaded and cannot be found
resolvent:
Still, looking for the element again
try:
# clcik to the next page
web.find_element_by_xpath('//*[@id="nexthehe"]').click()
# time.sleep(1)
except Exception:
print('failed to next page')
web.find_element_by_xpath('//*[@id="nexthehe"]').click()
linux rust download dependency error
if a proxy or similar is necessary net.git-fetch-with-cli
Create config in cargo
vi ~/.cargo/config
1
add proxy
[http]
proxy = "127.0.0.1:7891"
[https]
proxy = "127.0.0.1:7891"
Or modify the download warehouse
[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"
replace-with = 'ustc'
[source.ustc]
registry = "git://mirrors.ustc.edu.cn/crates.io-index"
Pro test, modify and download the warehouse.
Solution to the error in compiling couldn't resolve host name (could not resolve host: Crites) by rust
When compiling the rust source program, the following couldn’t resolve host name (couldn’t resolve host: Crites) errors may occur (see https://github.com/ustclug/discussions/issues/294 ）。
A temporary solution is to add the environment variable cargo when running cargo_ HTTP_ MULTIPLEXING=false。 The function is to cancel parallel downloads. For specific reasons, please refer to the error report of building rustc after using the image.
Pro test passed!
The method is as follows:
# redis connection, chain refers to the test environment Redis environment
r = redis.Redis(host='localhost', port=7622, db=0, decode_responses=True)
item_list = r.keys(pattern='*app_access##qa_press_test*')
# need to determine if there is a matching value, if not, it will report an error, so need to determine the processing
if len(item_list):
# Batch delete all cached application keys
r.delete(*r.keys(pattern='app_access*'))
logger.info("clear success...")
else:
logger.warn("with no data need to delete...")PS: there is a detail to note here, that is, deleting directly without matching data will report an error, which needs to be handled
Note: conn.keys (‘test ‘) returns a list matching the corresponding pattern. Through the * sign, you can see that the parameters in the delete () method use variable parameters, that is, you can pass in a variable number of key values and delete them all.
Python + Flash + Flash Sqlalchemy to realize MySQL database operation
Write test cases in Python to realize MySQL query
The test cases are as follows:
class MySQLTest(unittest.TestCase):
def test_queryAll(self):
uas = db.session.query(UserAgent).all()
self.assertIsNotNone(uas)
for ua in uas:
print("\n")
print(ua)
if __name__ == '__main__':
unittest.main()
1、 Problem description
Error message below
RuntimeError: No application found. Either work inside a view function or push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/.
If no application is found, either work in the view function or push the application context
The first reaction should be related to writing test cases in Java Web applications, and the application context cannot be found
2、 Problem analysis
The test case starts a thread to execute database operation separately, which is independent of the flash application. It is unable to obtain the configuration information of the flash application context (including database connection information), so it is necessary to push the application context (inject context object)
This is why it works in the view function, which runs in the web container of flash.
3、 Solution
Python uses the with statement to manage context
The with statement is essentially context management
1. Context management protocol. Inclusion method__ enter__() And exit (), which support the protocol object to implement these two methods
2. The context manager defines the runtime context to be established when executing the with statement, and is responsible for executing the entry and exit operations in the context of the with statement block
3. Execute when entering the context__ enter__ Method. If the as var statement is set, the VaR variable accepts__ enter__() Method returns a value
4. If an exception occurs during runtime, exit the context manager. Call manager__ exit__ method.
Push the application context, that is, at the top where the thread starts executing code,
add with app.app_ context():
class MySQLTest(unittest.TestCase):
def test_queryAll(self):
with app.app_context():
uas = db.session.query(UserAgent).all()
self.assertIsNotNone(uas)
for ua in uas:
print("\n")
print(ua)
if __name__ == '__main__':
unittest.main()
4、 Result verification
Add with app.app_Context():
just write your own program logic, and the test case runs successfully
Gitlab is stuck in Ruby_ block[wait for redis service socket] action run
Environment: Ubuntu 20
When installing gitlab , execute sudo gitlab CTL reconfigure , and get stuck in this place when the /etc/gitlab/gitlab.rb file is installed
Insert a picture description here
and wait for a long time, but you don’t see any change in the log information output from the console.
Solution:
open another terminal and start the following command
sudo /opt/gitlab/embedded/bin/runsvdir-start
Or execute the above command in the background in the current terminal window
nohup /opt/gitlab/embedded/bin/runsvdir-start &
Then execute
sudo gitlab-ctl reconfigure
type MeshStatus struct {
// INSERT ADDITIONAL STATUS FIELD - define observed state of cluster
// Important: Run "make" to regenerate code after modifying this file
AvailableReplicas int `json:"available_replicas,omitempty"`
readyReplicas int `json:"ready_replicas,omitempty"`
Replicas int `json:"replicas,omitempty"`
}
error: struct field readyReplicas has json tag but is not exported
Cause of the error readyReplicas does not have a capitalization at the beginning ReadyReplicas
1. You can try to install this dependency first, and then try to compile whether it can be compiled normally
apt-get --reinstall install libmpc3
2. If it still doesn’t work, you can check whether there is this file in your compilation package path, or whether there is this file in other paths. If so, open the file with VI and insert a line below your path
sudo vi /etc/ld.so.conf
For example, mine is/opt/usr/lib
and then refresh
sudo ldconfig
This problem is caused by too low PHP version + too high MYSQL version
MYSQL8.0+ version introduces a new character set utf8mb4
Change the old utf8 alias to utf8mb3
The old PHP’s MYSQLND module does not include the new character set
So there will be
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Error when using mysqli:
PHP Warning: mysqli::__construct(): Server sent charset (255) unknown to the client. Please, report to the developers in ... on line 3
Error when using PDO_MYSQL:
Connection failed: SQLSTATE[HY000] [2054] Server sent charset unknown to the client. Please, report to the developers
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The solution is simple, just upgrade to a new PHP version
Official https://bugs.php.net/bug.php?id=74461
Written
[2018-05-02 12:13 UTC] [email protected]
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Should be fixed as of 7.0.19, 7.1.5, and 7.2.0. Anyone confirm?
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[2018-05-02 17:37 UTC] macleo at outlook dot com
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Should be fixed as of 7.0.19, 7.1.5, and 7.2.0. Anyone confirm? – yes
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So the 7.0+ version is basically OK
This problem occurs because Nvidia’s official restrictions
limit 2 concurrent processing tasks for different desktop-level products. For
detailed restrictions on each product, please refer to
https://developer.nvidia.com/video-encode-decode-gpu -support-matrix#Encoder
We can remove this restriction through the following patch
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cd /opt
git clone https://github.com/keylase/nvidia-patch
cd nvidia–patch
# patch remove limite 2 sessions
bash ./patch.sh
# patch restore limit 2 sessions
bash ./patch.sh –r
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Start ffmpeg
The above picture has started 4 ffmpeg HW transcoding processes, and there is no error message
. Special attention needs to be paid here. The graphics card memory used by the control process should not exceed the total graphics card memory. If it exceeds, there will be frame loss, green screen and other problems
As shown in the figure, our RTX 2070 Super has 8G video memory, and 4 processes take up 10% or so, so according to 400/process, the maximum of about 18-20 processes can be enabled.
The server with 10Gbps port installed 2 NVME hard disks, and the
result of frequent problems occurred. The
log of the problem of disk drop is as follows
Mar 10 13:10:10 10Gbps kernel: nvme nvme0: I/O 183 QID 3 timeout, aborting
Mar 10 13:10:10 10Gbps kernel: nvme nvme0: Abort status: 0x0
Mar 10 13:10:13 10Gbps kernel: nvme nvme0: I/O 384 QID 4 timeout, aborting
Mar 10 13:10:13 10Gbps kernel: nvme nvme0: Abort status: 0x0
Mar 10 13:10:14 10Gbps kernel: nvme nvme0: I/O 626 QID 5 timeout, aborting
Mar 10 13:10:14 10Gbps kernel: nvme nvme0: Abort status: 0x0
Mar 10 13:10:15 10Gbps kernel: nvme nvme0: I/O 879 QID 7 timeout, aborting
Mar 10 13:10:15 10Gbps kernel: nvme nvme0: Abort status: 0x0
Mar 10 13:10:28 10Gbps kernel: nvme nvme0: I/O 221 QID 5 timeout, aborting
Mar 10 13:10:28 10Gbps kernel: nvme nvme0: Abort status: 0x0
Mar 10 13:10:34 10Gbps kernel: nvme nvme0: I/O 510 QID 1 timeout, reset controller
Mar 10 13:10:55 10Gbps kernel: nvme nvme0: Device not ready; aborting reset, CSTS=0x1
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 271133736 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 2052266888 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 2175930376 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 7072889400 op 0x0:(READ) flags 0x80700 phys_seg 17 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 238328656 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 3954686056 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 6440531640 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 7301389616 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 6288979456 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Mar 10 13:10:55 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 2149595472 op 0x0:(READ) flags 0x80700 phys_seg 6 prio class 0
Mar 10 13:11:16 10Gbps kernel: nvme nvme0: Device not ready; aborting reset, CSTS=0x1
Mar 10 13:11:16 10Gbps kernel: nvme nvme0: Removing after probe failure status: -19
Mar 10 13:11:36 10Gbps kernel: nvme nvme0: Device not ready; aborting reset, CSTS=0x1
Mar 10 13:11:36 10Gbps kernel: print_req_error: 6 callbacks suppressed
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 2000203632 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 68158880 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 4036854464 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 78773728 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 1987798736 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 1986001320 op 0x0:(READ) flags 0x1000 phys_seg 1 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 4082978496 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 5906970992 op 0x0:(READ) flags 0x1000 phys_seg 1 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 3962823040 op 0x0:(READ) flags 0x1000 phys_seg 4 prio class 0
Mar 10 13:11:36 10Gbps kernel: blk_update_request: I/O error, dev nvme0n1, sector 6902965512 op 0x1:(WRITE) flags 0x100000 phys_seg 40 prio class 0
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): metadata I/O error in “xfs_trans_read_buf_map” at daddr 0x160153970 len 8 error 5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): metadata I/O error in “xfs_trans_read_buf_map” at daddr 0xf09d82c0 len 32 error 5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): metadata I/O error in “xfs_trans_read_buf_map” at daddr 0x98fd6a0 len 32 error 5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): metadata I/O error in “xfs_trans_read_buf_map” at daddr 0x4b1fde0 len 32 error 5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: nvme0n1: writeback error on inode 6619987520, offset 0, sector 6902965832
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): metadata I/O error in “xfs_trans_read_buf_map” at daddr 0xec33e180 len 32 error 5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_do_force_shutdown(0x2) called from line 1250 of file fs/xfs/xfs_log.c. Return address = 00000000147aed99
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): Log I/O Error Detected. Shutting down filesystem
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): Please unmount the filesystem and rectify the problem(s)
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): log I/O error -5
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:36 10Gbps kernel: nvme0n1: writeback error on inode 77133302, offset 0, sector 684881640
Mar 10 13:11:36 10Gbps kernel: XFS (nvme0n1): xfs_imap_to_bp: xfs_trans_read_buf() returned error -5.
Mar 10 13:11:39 10Gbps kernel: VFS: busy inodes on changed media or resized disk nvme0n1
Mar 10 13:11:39 10Gbps kernel: nvme nvme0: failed to set APST feature (-19)
Mar 10 13:11:39 10Gbps systemd[1]: Stopped target Local File Systems.
analyzed that
most of the reasons are caused by intensive reading and writing.
This is a CDN cache node. Type reading
NVME temperature is relatively high, if it continues, it will start to throttle
and then slowly collapse.
And because this is ADATA’s XPG consumer product, it is not an enterprise-level
problem-solving
1. Replaced with Samsung’s PRO series, because the other two use Samsung There is no problem with the product
2. Try to increase heat dissipation