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Florent Clairambault fclairamb

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fclairamb / tree_next.c
Created July 21, 2014 23:57
AVL tree with the parent node for each node to easily get the next node
#ifdef SHELL
gcc -Wall -Werror $0 && ./a.out
exit $?
#endif
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#define max(a,b) \
@fclairamb
fclairamb / gist:64fd728741b980979474
Created September 28, 2014 20:22
Cassandra 2.1 - Repair issue
INFO [AntiEntropyStage:227] 2014-09-28 15:00:41,982 RepairSession.java:171 - [repair #1d30ffe0-474a-11e4-84bd-79f3bc6874b0] Received merkle tree for registrynodedata from /172.16.66.81
ERROR [AntiEntropyStage:227] 2014-09-28 15:00:41,982 CassandraDaemon.java:166 - Exception in thread Thread[AntiEntropyStage:227,5,main]
java.lang.ClassCastException: null
ERROR [RepairJobTask:3] 2014-09-28 15:00:41,983 RepairJob.java:127 - Error occurred during snapshot phase
java.lang.RuntimeException: Could not create snapshot at /172.16.66.81
at org.apache.cassandra.repair.SnapshotTask$SnapshotCallback.onFailure(SnapshotTask.java:77) ~[apache-cassandra-2.1.0.jar:2.1.0]
at org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:48) ~[apache-cassandra-2.1.0.jar:2.1.0]
at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) ~[apache-cassandra-2.1.0.jar:2.1.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_20]
at java.util.concurren
@fclairamb
fclairamb / gist:68d61b43bb1b9f52ab05
Created September 28, 2014 20:28
Cassandra 2.1 - Repair issue (2)
INFO [AntiEntropyStage:6] 2014-09-28 22:27:45,482 RepairSession.java:171 - [repair #e4bf3e70-474d-11e4-a221-2fe2626539ec] Received merkle tree for domain from /172.16.66.81
ERROR [RepairJobTask:1] 2014-09-28 22:27:45,484 RepairJob.java:127 - Error occurred during snapshot phase
java.lang.RuntimeException: Could not create snapshot at /172.16.66.81
at org.apache.cassandra.repair.SnapshotTask$SnapshotCallback.onFailure(SnapshotTask.java:77) ~[apache-cassandra-2.1.0.jar:2.1.0]
at org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:48) ~[apache-cassandra-2.1.0.jar:2.1.0]
at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) ~[apache-cassandra-2.1.0.jar:2.1.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_67]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
ERROR [AntiEntropyStage:6] 2014-09-28 22:27:45,484 C
@fclairamb
fclairamb / cassandra-sstables-count.sh
Last active August 29, 2015 14:07
Cassandra: Number of sstable files
#!/bin/sh
# To put in /etc/cron.daily
date=$(date +%Y-%m-%d)
cd /var/lib/cassandra/data
for dir in $(find -mindepth 2 -maxdepth 2 -type d)
do
count=$(ls $dir/*-Data.db 2>/dev/null | wc -l)
echo ${date}: ${count} >>$dir/sstables_count
done
@fclairamb
fclairamb / change_oom_score.c
Last active August 29, 2015 14:07
Change OOM priority score
#ifdef SHELL
gcc -Wall -Werror $0 && ./a.out
exit $?
#endif
#include <stdio.h>
void change_oom_score(int oom_adj) {
FILE * fp = fopen("/proc/self/oom_adj", "w"); // Old one (SK20)
if ( ! fp ) fp = fopen("/proc/self/oom_score_adj", "w"); // New one
@fclairamb
fclairamb / tab.c
Created December 12, 2014 09:34
Multi-dimentionnal C array address
#ifdef SHELL
gcc -Wall -Werror $0 && ./a.out
exit $?
#endif
/*
Output:
Table : 0x7fff03ab7490
Row 0 : 0x7fff03ab7490
Cell 0:0 : 0x7fff03ab7490
@fclairamb
fclairamb / var_sized.c
Last active August 29, 2015 14:11
variable size object
#ifdef SHELL
gcc -std=c99 -Wall -Werror $0 && ./a.out
exit $?
#endif
#include <stdio.h>
/*
Output:
@fclairamb
fclairamb / permutation.c
Last active August 29, 2015 14:20
string permutation
#ifdef SHELL
gcc -ansi -g $0 && ./a.out
exit 0
#endif
#include <stdio.h>
#include <string.h>
void permutation (char * prefix, char * str) {
int n = strlen(str);
@fclairamb
fclairamb / stack_trace.c
Last active August 29, 2015 14:26 — forked from banthar/stack_trace.c
stacktrace with libunwind and elfutils
// stack_trace.c
//
// gcc stack_trace.c -ldw -lunwind -g -o stack_trace
#define UNW_LOCAL_ONLY
#include <elfutils/libdwfl.h>
#include <libunwind.h>
#include <stdio.h>
@fclairamb
fclairamb / svn_changes_notifications.sh
Created October 9, 2015 10:02
Jenkins SVN changes notifications (when your sysadmins don't want to add a post-commit hook to the SVN repository)
[ -f /usr/bin/svn ] || sudo apt-get install subversion -y
[ -f /usr/bin/mail ] || sudo apt-get install mailutils -y
[ -f /usr/bin/pip ] || sudo apt-get install python-pip -y
sudo pip install pygments >/dev/null
SVN_NEW=$SVN_REVISION_1
SVN_OLD=$(cat svn_old ||:)
echo $SVN_NEW >svn_old
svn log $SVN_URL -r $(expr $SVN_OLD + 1 ):$SVN_NEW >logs.txt
svn diff $SVN_URL -r $SVN_OLD:$SVN_NEW >diff.txt
cat diff.txt | pygmentize -l diff -f html -O noclasses,nobackground -o diff.html