Chart's big data GCC upgrading

1. Overview

1.1 Version

Note: when the concurrency of big data chart is high, the chart group will only display the data of the first 5000 groups.

1.2 Problem description

When the FineBI version after June 2019 uses the chart big data function, if it is deployed in the Linux environment, it needs to load "libj2v8" of "libj2v8_linux_x86_64.so". So "depends on the corresponding version of GCC, and the GCC version of the system needs to be upgraded. If the GCC version is not upgraded, the following problems may exist:

• For the FineBI version on June 14, 2019, if the system GCC does not meet the requirements, the chart big data cannot be used, and an error is displayed: "J2V8 native library not loaded(j2v8-linux-x86_64/j2v8-centos-Linux-x86_64)"

• For the FineBI version on July 4, 2019, if the system GCC does not meet the requirements, when drawing a large amount of data chart, the chart component display is limited to 50000 grouped data, and the drawing time is long.

1.3 Solutions

If you want to display more data when drawing big data charts, you can upgrade the GCC version in Linux system according to the steps in Section 2 of this article, and use J2V8 as the JS running environment when drawing charts.

2. Operation steps

2.1 Determine whether to upgrade

Before upgrading, you need to confirm the GCC version in the current system and use the following name to check whether "GLIBC_2.18" and "GLIBCXX_3.4.22" is in the system, the command is as follows:

strings /lib64/libc.so.6 | grep GLIBC

strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX

If there is no corresponding GCC version in the viewing system, you can consider whether to upgrade as needed.

2.2 Upgrade steps

1) To download the upgrade tool, see:

升级工具.tar

2) Unzip the upgrade tool, copy it to any directory other than "user", enter the directory from "cd", and execute the following command:

chmod 755 glibcxx_3.4.22.sh

chmod 755 glibc_2.18.sh

./glibcxx_3.4.22.sh

./glibc_2.18.sh

Here, "chmod" adds execution permission for the script, and ". /" executes the obtained script.

3) After executing the command, the system will automatically upgrade the GCC version.

3. Precautions

3.1 Upgrade risk

3.1.1 GLIBC 

GLIBC is the C runtime library and the lowest API layer in the Linux system (including various commands of Linux depend on this library). If there are other important projects in the system, please upgrade carefully. The corresponding upgrade tool file is "glibc_ 2.18.sh".

3.1.2 GLIBCXX

Glibcxx is a C++ runtime. Generally, the upgrade will not have much impact, and if there is a problem after the upgrade, you can roll back the version. The corresponding upgrade tool file is "glibcxx_ 3.4.22.sh".

3.2 Lack of available C compilation environment

3.2.1 Problem description

If the following error is reported during upgrading:

3.2.2 Cause analysis

It may be due to the lack of available C compilation environment.

3.2.3 Solutions

Execute Yum-y install gcc to install the compilation environment, and then upgrade GCC again.