Responsive Neomorphism Login and Registration Form in HTML and CSS
Another single point of failure remains, the leader node. What happens if the leader node is down? One solution to this is to use a secondary leader node. The secondary leader will quietly observe the leader, whoever sees that the leader is down, will then take over as leader. If the leader recovers in this fake, the former leader will now move to the secondary position. Both primary and secondary must maintain a copy of the metadata.
Now you may ask what happens if both the leader nodes are down? In fact, there is no such thing as 100% failsafe in a distributed system, if you want you can increase the reliability by adding a third leader, but even then there is a possibility of system down. And the more nodes you add, the more your server bill will increase, the maintenance will be complicated. Making the site reliable while keeping costs down is a huge challenge for DevOps engineers.
The architecture of the distributed file system that I have shown so far is not an imaginary design of mine, it is the top-level architecture of HADOOP Distributed File System or HDFS in short by the Apache company. There is a technique for data processing in distributed file systems called map-reduce.
Responsive Neomorphism Login and Registration Form in HTML and CSS
The very hello-world of big data processing is map-reduce, Google researchers first discovered this technique, there is a famous research paper about it, you can find it by searching map reduce paper. The Apache company has also developed an ecosystem for applying map-reduce to files stored in HDFS, so HDFS is very popular.
I worked in a big e-commerce company recommendation team for a while, where we stored various user data, server logs etc. in HDFS and then sent product suggestions to users using some other big data processing techniques including map-reduce. Machine learning algorithms can be easily run on very large data sets due to this sharing of data. Each data node has the ability to apply algorithms on that node’s data, so data does not need to be moved elsewhere.
The architecture I described is not the end, there are many more complexities in HDFS. As keeping data consistent across different data nodes is a big challenge, how can you be sure all replicas have exactly the same data? There is a very complex algorithm called Paxos to maintain this consistency, HDFS implements it using a tool called Zookeeper, you can dig into the details if you want.
That’s it for today, happy coding!
Shakib-Mushfique waiting for seven thousand
Bangladesh is starting a three-match ODI series against Ireland at the Sylhet International Cricket Stadium from Saturday (March 18). Shakib and Mushfiqur are waiting to touch the milestone of 7000 runs in ODIs before the start of the series. After that, Shakib has scored 6976 runs in 215 innings of 227 matches for the country so far. He has 9 centuries and 52 half-centuries. Shakib’s batting average is around 37.70.
Mushfiqur made his ODI debut in the same match as Shakib. But Mushi has played more matches than Shakib. Mushfiq has scored 6901 runs with 8 centuries and 43 half-centuries in 227 innings of 242 matches for the country so far. His batting average is around 36.32. Tamim was the first to complete 7000 ODI runs in Bangladesh jersey. Tamim scored 8143 runs in 232 innings of 234 matches.
Chandika Hathurusinghe, head coach of the Bangladesh team, came to the press conference before the match on Friday (March 17) before taking the field in the first ODI against Ireland. Asked if Mahmudullah is past his prime, Hathurusinghe said, “I don’t think he is past it.” What we want to do is to increase our pool of players before the World Cup.
He also said, ‘If something happens near the World Cup, then there should be enough players. We have seen, or can believe, such for any duty. We want to take that opportunity. There are 15 matches before the World Cup. We are trying to give opportunities to players who can play a role. Riyadh is still there.
Miraj fell to the ground as soon as the ball hit his face. Bangladesh team physio Baijidul Islam came and observed for a while. Miraj was then taken to the hospital for a CT scan. But the CT scan report did not show anything bad.
Debashish Chowdhury, chief doctor of Bangladesh Cricket Board (BCB), said, “He has got football in his eyes. We have done his CT scan. The report is good. Referred to eye doctor. There is blood in the eyes. But his situation will be understood only after receiving the report.
A survey of 2,705 educational institutions, 207 hospitals, 36 police stations and 304 other buildings was conducted under the Earthquake Resilience Project (Urban Resilience) on government and autonomous institutions in Dhaka, Narayanganj and Gazipur to deal with disasters. A ‘Preliminary Engineering Assessment’ (PEA) was done for 579 of these buildings. Among them, Jobi had 4 buildings at risk.
Last Saturday (March 13) in a meeting at the Osmani Memorial Auditorium in the capital, the convener of the Urban Development Committee and Housing and Public Works Secretary Kazi Washi Uddin brought up the issue.
These buildings must be demolished within the next three months, otherwise Rajuk will take action.
Responsive Neomorphism Login and Registration Form in HTML and CSS
It is known that Jagannath University is located in the most dangerous area of Old Dhaka, the busiest part of the capital. All four academic and administrative buildings in this school of about 20,000 students have been identified as highly vulnerable. So there is a risk of massive loss of life in any accident. In this, the university’s teachers-students and staff-employees are conducting education and administrative activities in panic.
When asked about the demolition of 4 dangerous buildings, Chief Engineer of Jagannath University Helal Uddin Patwari said, “Rajuk has not received a letter regarding which four buildings are dangerous.” If we get a letter from Rajuk then we will take action.
Recently, the issue of safety of the building came into discussion after the recent accident and loss of life in the Cafe Queen building explosion in Siddiqbazar.
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